Fault table: Fault codes 00513...00671
Fault table: Fault codes 00513...00671
Notes:





◆Faults occurring in monitored sensors or components are stored in fault memory together with
an indication of the type of fault.
◆The fault table is arranged according to the 5-digit fault codes on the left.
◆Sporadic faults are marked "SP" on the fault reader display.
◆Do not immediately replace components indicated as being defective by the fault reader, but
rather: Start by checking wiring and connectors to these components in line with current flow
diagram. Also use current flow diagram to check earth connections. This is particularly important
if faults are output as being "sporadic" (SP).
◆After eliminating faults, erase fault memory.
Output on printer of
V.A.G 1551
00513
Engine speed sender
-G28
Implausible
signal
Possible cause of trouble
Possible effects
Fault remedy
Stored if engine speed sender pulse train changes more rapidly than would be
possible with change in engine speed
- Glow period
- Sender wheel at flywheel or
warning lamp
- Check sender
sender pins at torque converter
flashes
wheel
plate damaged
- Loss of power
(torque reduction)
- Check engine
- -G28 defective
speed sender =>
Page 23-64
Stored if engine speed and injection pump speed senders have detected
No signal
different speeds
- Glow period
- -G28 defective
warning lamp
- Check engine
- Open circuit in wiring/short
flashes
speed sender =>
circuit
- Loss of power
Page 23-64
(torque reduction)
Output on printer of V.A.G
Possible
Possible cause of trouble
Fault remedy
1551
effects
00519
Intake manifold pressure
sender -G71
Stored if intake manifold pressure sender signal voltage is greater than
Short to positive
4.8 V
- Open circuit or short to
- Loss of
- Check intake manifold
positive in wiring
power
pressure sender
- -G71 defective
Open circuit/short to
Stored if intake manifold pressure sender signal voltage is less than 0.68
earth
V
- Open circuit or short to
- Loss of
- Check intake manifold
earth in wiring
power
pressure sender
- -G71 defective
Output on printer of
Possible
Possible cause of trouble
Fault remedy
V.A.G 1551
effects
00519
Intake manifold
pressure sender -G71
Power supply
Stored if intake manifold pressure sender power supply is less than 4.92 V or
Implausible signal
Output on printer of
V.A.G 1551
00522
Coolant temperature
sender -G62
Short to earth
Open circuit/short
to positive
greater than 5.03 V
- Open circuit in wiring or
- Check intake manifold
short circuit
- Loss of power
pressure sender
- -G71 defective
Stored at an engine speed of less than 1000 rpm if for approx. 3 seconds:
Difference between atmospheric pressure and charge pressure is greater than
400 mbar
- Ice on -G71
- Check intake manifold
- Loss of power
- -G71 defective
pressure sender
Possible cause of
Possible effects
Fault remedy
trouble
Stored if coolant temperature sender signal voltage is less than 0.2 V
- Black smoke on starting
- -G62 defective
- Check coolant
- Preheating always
- Short to earth in
temperature sender
implemented for approx. 20
wiring
=>Page 23-69
s
Stored if coolant temperature sender signal voltage is greater than 4.95 V
- -G62 defective
- Open circuit or short
to positive in wiring
Output on printer of
V.A.G 1551
00523
Intake air temperature
sender -G42
Short to earth
Open circuit/short to
positive
Possible cause of
trouble
- Black smoke on starting
- Check coolant
- Preheating always
temperature sender
implemented for approx. 20
=>Page 23-69
s
Possible
Fault remedy
effects
Stored if intake air temperature sender signal voltage is less than 0.12 V
- Check intake air
- -G42 defective
- Fixed
temperature sender
- Short to earth in wiring
substitute value
=>Page 23-71
Stored if intake air temperature sender signal voltage is greater than 4.85 V
- -G42 defective
- Check intake air
- Fixed
- Open circuit or short to
temperature sender
substitute value
positive in wiring
=>Page 23-71
Output on printer of Possible cause of
Possible effects
Fault remedy
V.A.G 1551
trouble
00532
Supply voltage
Signal too low
Stored if engine control unit supply voltage is less than 9 V for 60 seconds
- Battery flat
- Engine will not start
- Check battery voltage
- Poor wiring
- Engine running
Check power supply for diesel
connection to engine problems and
direct injection system=>Page
control unit
possibly even cut-out
23-56
No fault type
Stored in the event of internal engine control unit fault
identified
- Engine control unit
- Replace engine control unit
- Engine will not start
defective
=> Page 23-42
Implausible
Stored if voltage is not constantly applied to engine control unit when ignition is
signal
switched on
- Check power supply for
- Sporadic open
- Engine will not start
diesel direct injection system
circuit (loose contact)
=>Page 23-56
Output on
Possible cause of trouble
Possible effects
Fault remedy
printer of V.A.G
1551
00532
Supply voltage
Stored if engine control unit terminates self-holding phase but power supply is not
interrupted (power is still applied to engine control unit for 4...10 minutes after
switching off ignition - self-holding phase)
- Diesel direct injection
- Check battery voltage
system relay defective
- Battery
Check power supply for diesel
(contacts sticking)
discharge
direct injection system=>Page
- Short to positive in wiring
23-56
Stored if power supply to engine control unit is interrupted during self-holding phase
Input open
(engine control unit de-energises diesel direct injection system relay on completion of
self-holding phase - 4...10 minutes - and disconnects itself from power supply)
- Battery disconnected within
- Glow period
10 minutes of ignition being
warning lamp
- Erase fault memory
switched off
flashes
- Diesel direct injection
- Check power supply for diesel
system relay incorrectly
direct injection system =>Page
connected
23-56
Output on printer of Possible cause of
Possible effects
Fault remedy
V.A.G 1551
trouble
00534
Oil temperature
sender -G8
Short to earth
Stored if oil temperature sender signal voltage is less than 0.2 V
- Fixed substitute
- Eliminate open circuit in wiring
- -G8 defective
value
or short circuit
- Short to earth in
- Reduced power
=> Current Flow Diagrams,
wiring
output (engine
Electrical Fault-finding and
protection)
Fitting Locations binder
Implausible
Stored if coolant temperature is greater than 70 °C but oil temperature is less
signal
than -10 °C
- Fixed substitute
- Eliminate open circuit in wiring
- -G8 defective
value
or short circuit
- Open circuit or
- Reduced power
=> Current Flow Diagrams,
short to positive in
output (engine
Electrical Fault-finding and
wiring
protection)
Fitting Locations binder
Output on printer of
Possible cause of trouble Possible effects
Fault remedy
V.A.G 1551
00539
Fuel temperature
sender -G81
Signal outside
Stored if fuel temperature in injection pump is greater than 100 °C
tolerance
- Reduced power
- Full throttle at extremely
- Allow vehicle to cool
output (engine
high ambient temperature
down
protection)
- Fuel filter or pipe clogged
- Check fuel system
Stored if fuel temperature in injection pump is less than -50 °C or greater than
Defective
150 °C
- Replace injection
- -G81 defective
pump=>Page 23-8
Output on printer of
Possible cause of
Possible effects
Fault remedy
V.A.G 1551
trouble
00542
Needle lift sender -G80
Short to earth
Stored if needle lift sender signal voltage is less than 0.03 V
Short to
positive
- -G80 defective
- Open circuit in wiring
or short circuit
Open circuit/short
to positive
Output on
printer of V.A.G
1551
00546
Data cable
defective
(No
display)
- Glow period warning
lamp flashes
- Check needle lift
sender=>Page 23-67
Stored if needle lift sender signal voltage is greater than 2.12 V
- -G80 defective
- Glow period warning
- Open circuit in wiring
lamp flashes
or short circuit
Possible
cause of
Possible effects
Fault remedy
trouble
- Check needle lift
sender=>Page 23-67
Stored in the event of problems with but no break in information exchange between
engine control unit and injection pump via signal wire
- Interrogate all control units with CAN
- Engine will not
capability and start by rectifying all faults
- Signal wire to
start
displayed
injection pump
- Engine running
Read measured value block 18 and check
defective
problems and
that injection pump power supply in display
- Short circuit in
possibly even cutzone 1 is at least 10.5 V and that all bits are
CAN bus
out
set to 0 in display zone 3
Test sequence is continued in next table
Output on
Possible
Possible
printer of
cause of
Fault remedy
effects
V.A.G 1551
trouble
- Unplug connector at injection pump and check pins for
corrosion and firm attachment; re-attach connector and
erase fault memory; then start engine and interrogate
fault memory again
Check CAN terminating resistor of injection pump=>Page
23-51
Test sequence is continued in next table
Output on printer of
Possible cause of Possible
Fault remedy
V.A.G 1551
trouble
effects
- Check signal wire between engine
control unit and injection pump
=> Page 23-49
Stored in the event of break in information exchange between engine
No communication
control unit and injection pump via signal wire
- CAN bus
Localise break in CAN bus between
overloaded
the various control units
Notes:



◆If storage of fault code "00546" is accompanied by fault code "1318 No communication", date
of engine control unit manufacture must be checked.
◆On account of incorrectly dimensioned resistor in engine control unit, engine stutters or cuts out
at high ambient temperatures and with intense sunlight penetration. Faults can be erased and
engine will start again after vehicle has been left standing in the shade for roughly 1 hour.
◆Check sticker on engine control unit to establish whether date of manufacture was between
14.04.01 and 12.07.01. If this is the case and the two faults mentioned above have been stored,
engine control unit is to be replaced.
Output on printer
of V.A.G 1551
00550
Injection
Possible cause of
trouble
Possible
effects
Fault remedy
commencement
regulation
Control
difference
Output on printer
of V.A.G 1551
Output on printer
of V.A.G 1551
00550
Injection
commencement
regulation
Control limit
not reached
Control limit
exceeded
Output on printer
of V.A.G 1551
00550
Injection
commencement
regulation
Implausible
signal
Stored if actual commencement of injection deviates from specification by more
than 3 °; specification is transmitted from engine control unit to injection pump;
specification and actual value are compared in injection pump
- Loss of power
at higher
- Check whether petrol or biodiesel have
engine speeds
- Petrol or biodiesel
been put in fuel tank. If so, drain tank and
- Engine
in tank
fill up with diesel fuel. Erase fault
starting
- Water in fuel
memory and road-test vehicle. Then
problems
- Air in fuel system
interrogate fault memory again.
- Gearbox in
- Commencement
Check fuel supply and return lines for
emergency
of injection not OK
obstructions or kinks.
running mode
Test procedure continued in next table.
- Fault 00575
stored
Possible cause
Possible
Fault remedy
of trouble
effects
- Drain water from fuel filter => Page 23-46
Erase fault memory and road-test vehicle.
Then interrogate fault memory again.
Possible cause of
Possible effects
Fault remedy
trouble
Stored if actual commencement of injection deviates from specification by more
than 3 °; actual commencement of injection is transmitted from needle lift sender to
engine control unit; specification and actual value are compared in engine control
unit
- Loss of power at
higher engine
- Commencement of
speeds
- Check and adjust
injection not OK
- Gearbox in
commencement of
- Needle lift sender -G80
emergency running
injection=>Page 23-67
defective
mode
- Engine jolts
Possible
cause of
Possible effects
Fault remedy
trouble
Stored in the event of abrupt change in injection timing control in injection pump
- Use of
- Loss of power at
petrol or
higher engine
- Check for use of petrol or biodiesel; if this
biodiesel
speeds
is the case: Drain tank and fill with diesel,
- Fuel filter
- Noisy combustion erase fault memory, perform test drive and
clogged
- Rattling noise in
then interrogate fault memory again
- Fuel pipes
pump (injection
Check for clogged or kinked supply and
clogged or
timing control)
return pipe
kinked
- Starting problems Test sequence is continued in next table
- Air in fuel
with cold engine
system
Output on printer of V.A.G 1551 Possible cause of trouble Possible effects Fault remedy
- Drain fuel filter
Output on printer of
Possible cause of trouble
Possible effects Fault remedy
V.A.G 1551
00553
Air mass meter -G70
Implausible signal
Open circuit/short
to earth
Stored if intake air mass is less than 190 mg/stroke or greater than 1300
mg/stroke at an engine speed of more than 1300 rpm
- Rough idling,
- Air cleaner clogged
loss of power
- Check intake
- Use of incorrect EGR vacuum hose or
- Fixed substitute system
mechanical EGR valve constantly open
value
- Loss of power,
- Check air
jolting
mass meter
- Air mass meter defective
- Fixed substitute => Page 23value
73
Stored if air mass meter signal voltage is less than 0.16 V
- Open circuit or short to earth in wiring
- -G70 defective
Output on printer of
V.A.G 1551
00553
Air mass meter -G70
Short to positive
Power supply
Output on printer of
V.A.G 1551
00560
Exhaust gas recirculation
system
Control limit not
reached
Control limit
exceeded
Possible cause of trouble
- Reduced power
- Fixed substitute
value
Possible effects
- Check air
mass meter
=> Page 2373
Fault remedy
Stored if air mass meter signal voltage is greater than 4.8 V
- Open circuit or short to
- Reduced power
- Check air mass
positive in wiring
- Fixed substitute
meter
- -G70 defective
value
=> Page 23-73
Stored if air mass meter power supply is less than 4.91 V or greater than
5.03 V
- Open circuit in wiring or short
- Reduced power
- Check air mass
circuit
- Fixed substitute
meter
- -G70 defective
value
=> Page 23-73
Possible
Possible cause of trouble
Fault remedy
effects
Stored if intake air mass drops below specified air mass by a certain
amount for approx. 10 seconds
- Exhaust gas recirculation valve -N18
- Reduced
defective
- Check EGR
power
- Hoses interchanged, clogged, leaking
system
- Black smoke
- Mechanical EGR valve defective
Stored if intake air mass exceeds specified air mass by a certain amount for
approx. 10 seconds
- Exhaust gas recirculation valve -N18
defective
- Check EGR
- Hoses interchanged, not connected,
system
clogged, leaking
Output on printer of
Possible cause of trouble
Possible effects Fault remedy
V.A.G 1551
00575
Intake manifold
pressure
Stored if, above a specific engine speed and injection quantity, measured
Control limit not
charge pressure is 800 mbar below specified charge pressure for approx. 8
reached
seconds
- Hoses interchanged, not
- Charge
- Check basic setting,
connected, clogged, leaking
pressure too low
block 11=> Page 01-89
- Turbocharger defective
- Reduced power
Stored if, above a specific engine speed and injection quantity, measured
Control limit
charge pressure is 200 mbar above specified charge pressure for approx. 5
exceeded
seconds
- Charge
- Charge pressure control
pressure too high
solenoid valve -N75 defective
- Check basic setting,
- Abrupt loss of
- Turbocharger defective
block 11=> Page 01-89
power
(adjuster sticking)
- Reduced power
Output on printer of
Possible
Possible cause of trouble
Fault remedy
V.A.G 1551
effects
00625
Speed signal
Stored if, for approx. 10 seconds, engine speed is greater than 2800 rpm,
Implausible
injection quantity is greater than 22 mg/stroke and measured vehicle speed is
signal
less than 5 km/h
- Open circuit in wiring between
- No cruise
speedometer sender -G22 and dash
control function
panel insert
- No air
- Check vehicle
- -G22 defective
conditioner
speed signal =>
- Speedometer -G21 defective
function
Page 23-94
- Open circuit in wiring between dash - Possible load
panel insert and engine control unit
change jolts
Signal too high
Stored if measured vehicle speed is higher than 290 km/h
- No cruise
- Check vehicle
- Signal fault
control function
speed signal =>
- -G22 defective
- Possible load
Page 23-94
change jolts
Output on printer of V.A.G Possible cause
Possible effects
Fault remedy
1551
of trouble
00626
Glow period warning lamp K29
Open circuit/short to
Stored if engine control unit does not actuate glow period warning lamp
earth
and voltage is not applied to control unit input
- Open circuit in
- Check glow period
- No glow period warning
wiring
warning lamp => Page
lamp function
- Bulb defective
28-3
- Glow period warning
- Short to earth
lamp permanently lit
Output not
Stored if engine control unit actuates glow period warning lamp and
switched/short to
current flow at control unit input is too high
positive
- Check glow period
- Short to
- No glow period warning
warning lamp => Page
positive
lamp function
28-3
Possible
Output on printer of
Possible
cause of
Fault remedy
V.A.G 1551
effects
trouble
00628
Control element
setting monitoring
Implausible
Stored if engine control unit has transmitted cut-out signal to injection pump and
signal
injection pump confirms reception, but engine continues to run
- Injection
- Engine cuts
- Read measured value block 18, display
pump
out (safety shut- zone 3; if display is as follows: 00100000,
defective
off)
check cut-out signal => Page 23-8
Output on printer of
Possible cause of
Possible effects
Fault remedy
V.A.G 1551
00628
Control element setting
monitoring
Open circuit/short to
earth
trouble
Stored if engine control unit has transmitted cut-out signal to injection pump
but injection pump has not received signal
- Check cut-out
- Open circuit or short to
- Engine cuts out (safety
signal
earth in wiring
shut-off via signal wire)
=> Page 23-52
00628
Control element setting
monitoring
Short to positive
Output on printer of
V.A.G 1551
00667
Ambient temperature
signal
Implausible signal
Output on printer
of V.A.G 1551
00668
Vehicle voltage
terminal 30
Power supply
too low
Stored if injection pump has received cut-out signal but engine control unit
has not transmitted any signal
- Check cut-out
- Open circuit or short to
- Engine cuts out
signal
positive in wiring
=> Page 23-52
Possible cause of
Possible
Fault remedy
trouble
effects
Stored if ambient temperature signal is not received in engine control unit
- Open circuit in
- Check ambient temperature signal
wiring
=> Page 23-92
Possible cause of
Possible effects
Fault remedy
trouble
Stored if injection pump power supply is less than 6 V or greater than 24 V
- Injection pump
supply voltage too low
(battery flat)
- Poor wiring
connection to injection
pump
- Engine will not start
- Engine running
problems and possibly
even cut-out
- Check battery voltage
Check power supply for
diesel direct injection
system=>Page 23-56
- -E45 defective
- Open circuit in
wiring/short circuit
- Cruise control system
deactivated
- Check cruise control system
00671
CCS switch -E45
Undefined
switch status
Fault table: Fault codes 00741...65535
Fault table: Fault codes 00741...65535
Notes:




◆Faults occurring in monitored sensors or components are stored in fault memory together with
an indication of the type of fault.
◆The fault table is arranged according to the 5-digit fault codes on the left.
◆Sporadic faults are marked "SP" on the V.A.G 1551 display.
◆Do not immediately replace components indicated as being defective by the fault reader, but
rather: Start by checking wiring and connectors to these components in line with current flow

diagram. Also use current flow diagram to check earth connections. This is particularly important
if faults are output as being "sporadic" (SP).
◆After eliminating faults, erase fault memory.
Output on printer of
Fault
Possible cause of trouble
Possible effects
V.A.G 1551
remedy
00741
Brake pedal monitoring
Stored if brake light switch signals "brake pedal pressed" but brake pedal switch
Implausible signal
does not detect a pressed brake pedal, or vice versa
- Both brake lights defective
- Fuse defective
- Occasionally no throttle
- Switch incorrectly set
response, complete loss of
- Check
- Open circuit in wiring
power
brake light
- Brake light switch -F or
- Glow period warning lamp
brake pedal switch -F47
flashes
defective
Output on printer of
Possible
Possible cause of trouble
Fault remedy
V.A.G 1551
effects
00777
Accelerator position
sender -G79
Stored if idling speed switch signals "idling" but potentiometer detects a
Implausible signal
pressed accelerator pedal, or vice versa
- High idle
- Open circuit in wiring
- Check accelerator pedal
- No throttle
- -G79 defective
position sender
response
Short to positive
Stored if accelerator pedal position sender signal voltage is greater than 4.7 V
- Open circuit in wiring or
- High idle
- Check accelerator pedal
short to positive
- No throttle
position sender
- -G79 defective
response
Output on printer of
V.A.G 1551
00777
Accelerator position
sender -G79
Power supply
Output on printer of
V.A.G 1551
01028
Blower relay -J323
Open circuit/short to
earth
Output not
switched/short to
Possible cause of
trouble
Possible
effects
Fault remedy
Stored if accelerator pedal position sender power supply is less than 4.76 V or
greater than 5.2 V
- Open circuit in
- High idle
- Check accelerator pedal
wiring/short circuit
- No throttle
position sender
- -G79 defective
response
Possible
cause of
Possible effects
Fault remedy
trouble
Stored if engine control unit does not actuate radiator fan run-on control unit
-J138 and voltage is not applied to control unit input
- Eliminate open circuit in wiring or
- Open circuit in
short circuit
wiring
- No fan run-on
=> Current Flow Diagrams,
- Relay
Electrical Fault-finding and Fitting
defective
Locations binder
- Radiator fan
- Short to earth
permanently on
Stored if engine control unit actuates radiator fan run-on control unit -J138
and current flow at control unit input is too high
positive
- Short to
positive
Output on printer of
V.A.G 1551
01044
Control unit incorrectly
coded
Possible cause
of trouble
- No fan run-on
Possible effects
- Eliminate open circuit in wiring or
short circuit
=> Current Flow Diagrams,
Electrical Fault-finding and Fitting
Locations binder
Fault remedy
Stored in the event of impermissible code in engine control unit
- Glow period
- Invalid control
- Encode control unit
warning lamp
unit code
=> Page 01-95
flashes
01117
Load signal for
alternator terminal DF
Implausible signal
Output on printer of
V.A.G 1551
01126
Engine speed signal
Signal outside
tolerance
No signal
Output on printer
of V.A.G 1551
Stored if alternator load is 0% for 10 minutes
- Eliminate open circuit in wiring or
short circuit
- Open circuit in
=> Current Flow Diagrams, Electrical
wiring
Fault-finding and Fitting Locations
binder
Possible
Possible cause of trouble
Fault remedy
effects
Stored if pulses from engine speed sender are not received in injection pump
within a specific period
- Injection pump
- Engine will
- Check commencement of
commencement of injection
not start
injection
incorrect
- Engine cuts
=> Page 23-54
- Open circuit in wiring
out
Stored if no pulses from engine speed sender are received in injection pump
- Engine will
- Open circuit in wiring
not start
- Check engine speed signal
- Injection pump defective
- Engine cuts
=> Page 23-54
out
Possible
cause of
Possible effects
Fault remedy
trouble
01180
Engine/ACC.
electrical connection
Short to
Stored if current carried by air conditioner control and display unit wiring is too high
positive
- Check air-conditioner compressor
- Reduced vehicle
- Short circuit in
signal and air-conditioner compressor
acceleration with AC
wiring
shutoff
on
=> Page 23-87
Possible
Output on printer of
Possible
cause of
Fault remedy
V.A.G 1551
effects
trouble
01259
Fuel pump relay -J17
Open
Stored if engine control unit does not actuate fuel pump relay and voltage is not
circuit/short to
applied to control unit input
earth
- Open circuit
in wiring
- Check fuel pump relay
- Short to earth
=> Fuel Supply System - Diesel Engines;
Repair Group 20; Fuel Supply; Checking fuel
pump relay -J17 and actuation
Output on printer of V.A.G
1551
01259
Fuel pump relay -J17
Output not switched/short
to positive
Output on printer of
V.A.G 1551
Possible
cause of
trouble
Possible cause of
trouble
Possible effects
Fault remedy
Stored if engine control unit actuates fuel pump relay and current flow
at control unit input is too high
- Misfiring
- Check fuel pump
- Short to positive
- Engine cuts out
relay
Possible
effects
Fault remedy
01262
Boost pressure control
solenoid -N75
Open
Stored if engine control unit does not actuate charge pressure control solenoid
circuit/short to
valve and voltage is not applied to control unit input
earth
- Open circuit
- Reduced
in wiring
power
- Check basic setting, block 11=> Page 01-89
- Solenoid
- Charge
Check charge pressure control solenoid valve
valve
pressure too
defective
low
- Reduced
power
=> 6-cyl. Diesel Direct Injection Engine (TDI),
- Short to
- Charge
Mechanics; Repair Group 21; Checking
earth
pressure too
charge air system with turbocharger
high
Output on printer of V.A.G Possible cause of
Possible effects
Fault remedy
1551
trouble
01262
Boost pressure control
solenoid -N75
Output not
Stored if engine control unit actuates charge pressure control solenoid
switched/short to
valve and current flow at control unit input is too high
positive
- Reduced power
- Check basic setting, block
- Short to positive
- Charge pressure
11=> Page 01-89
too low
Possible
Output on printer of
cause of
Possible effects
Fault remedy
V.A.G 1551
trouble
01265
EGR valve -N18
Open
Stored if engine control unit does not actuate EGR valve and voltage is not
circuit/short to
applied to control unit input
earth
- Open circuit
- Check basic setting, block 3=> Page
in wiring
- No EGR
01-89
- Solenoid
Check exhaust gas recirculation valve
valve defective
- Excessive exhaust
=> 6-cyl. Diesel Direct Injection Engine
gas recirculation
- Short to earth
(TDI), Mechanics; Repair Group 26;
- Reduced power,
EGR system
black smoke
Output on printer of V.A.G
1551
01265
EGR valve -N18
Output not switched/short
to positive
Output on printer of
V.A.G 1551
01266
Glow plug relay -J52
Open circuit/short to
earth
Output not
switched/short to
positive
Possible cause of
trouble
Output on
printer of V.A.G
1551
01268
Metering control N146
Fault remedy
Stored if engine control unit actuates EGR valve and current flow at
control unit input is too high
- Check basic setting, block
- Short to positive
- No EGR
3=> Page 01-89
Possible
cause of
Possible effects
Fault remedy
trouble
Stored if engine control unit does not actuate glow plug relay and voltage is
not applied to control unit input
- Eliminate open circuit in wiring
- Open circuit
or short circuit
in wiring
- No glow plug
=> Current Flow Diagrams,
- Relay
system operation
Electrical Fault-finding and Fitting
defective
Locations binder
- Glow plug system
- Short to earth constantly in
operation
Stored if engine control unit actuates glow plug relay and current flow at
control unit input is too high
- Short to
positive
Output on
printer of V.A.G
1551
01268
Metering control N146
Defective
Possible
effects
Possible
cause of
trouble
Possible
effects
- No glow plug
system operation
- Eliminate open circuit in wiring
or short circuit
=> Current Flow Diagrams,
Electrical Fault-finding and Fitting
Locations binder
Fault remedy
Stored if quantity adjuster solenoid valve or actuator (in injection pump) is defective
- Quantity
adjuster
defective
- Injection
- Reduced
- Test sequence if engine starts:
pump supply
power output
Read measured value block 18, display zone 1
voltage too
(engine
(at least 11 V), all bits in display zone 3 must be
low
protection)
set to 0; if both display values are OK, erase
- Fault entry
- Engine cuts
fault memory, perform test drive and then
relating to
out (safety shut- interrogate fault memory again
CAN bus
off)
Test sequence is continued in next table
- Sporadic
short circuit in
wiring harness
Possible
Possible
cause of
Fault remedy
effects
trouble
- Check signal wire between engine control unit and
injection pump=>Page 23-8
Test sequence if engine will not start:
With ignition on, select measured value block 18
and check power supply in display zone 1:
Specification at least 11 V
Test sequence is continued in next table
Output on
printer of
V.A.G 1551
01268
Metering
control -N146
Possible
cause of
trouble
Possible
effects
Fault remedy
- Interrogate all control units with CAN capability and
start by rectifying all faults displayed
Unplug connector at injection pump and check pins for
corrosion and firm attachment; re-attach connector,
erase fault memory and then interrogate fault memory
again
If fault is entered again, replace injection pump
=>Page 23-8
Output on printer of V.A.G
1551
01282
Intake manif. flap ch.-over
valve -N239
Open circuit/short to
earth
Output not
switched/short to
positive
Possible cause
of trouble
Possible effects
Stored if engine control unit does not actuate changeover valve and voltage
is not applied to control unit input
- Open circuit in
- Check intake manifold
wiring
flap changeover valve
- Changeover
=> Page 23-79
valve defective
- Engine starts and
- Short to earth
immediately cuts out
again
Stored if engine control unit actuates changeover valve and current flow at
control unit input is too high
- Check intake manifold
flap changeover valve
=> Page 23-79
- Short to positive
Output on printer of
V.A.G 1551
Fault remedy
Possible
cause of
trouble
Possible effects
Fault remedy
01318
Control unit for
injection pump -J399
Defective
No fault type
identified
No signal
Signal outside
tolerance
Signal too high
Implausible
Stored if injection pump detects fault in self-test (injection pump control unit is
permanently connected to injection pump)
- Fault 01126 "Engine speed signal" must
- Injection
- Reduced power
not have been stored as well; if
pump
output (engine
necessary, check signal with oscilloscope
defective
protection)
Replace injection pump
=> Page 23-8
- Engine cuts out
(safety shut-off)
signal
Possible cause
Possible
Output on printer of
Fault remedy
of trouble
effects
V.A.G 1551
01318
Control unit for injection
pump -J399
No
Stored in the event of break in information exchange between engine control
communication
unit and injection pump via signal wire
- Erase fault memory if compression test has
been performed
Interrogate all control units with CAN
- Engine
capability and start by rectifying all faults
- Open circuit in
will not start displayed
signal wire to
- Engine
Read measured value block 18, display zone
injection pump
cuts out
1 (at least 10.5 V); if necessary, charge
battery, erase fault memory and then
interrogate fault memory again
Test sequence is continued in next table
Output on
printer of
V.A.G 1551
Possible
cause of
trouble
Possible
effects
Fault remedy
- Unplug connector at injection pump and check pins for
corrosion and firm attachment; re-attach connector,
erase fault memory and then interrogate fault memory
again
Check CAN terminating resistor of injection pump
=> Page 23-49
Notes:



◆If storage of fault code "1318 No communication" is accompanied by fault code "00546", date
of engine control unit manufacture must be checked.
◆On account of incorrectly dimensioned resistor in engine control unit, engine stutters or cuts out
at high ambient temperatures and with intense sunlight penetration. Faults can be erased and
engine will start again after vehicle has been left standing in the shade for roughly 1 hour.
◆Check sticker on engine control unit to establish whether date of manufacture was between
14.04.01 and 12.07.01. If this is the case and the faults mentioned above have been stored,
engine control unit is to be replaced.
Output on printer of
V.A.G 1551
01375
Engine mounting valve
stage 1
Open circuit/short
to earth
Output not
switched/short to
Possible cause of
trouble
Possible effects
Fault remedy
Stored if engine control unit does not actuate engine mounting valves and
voltage is not applied to control unit input
- Open circuit in
wiring
- Electrohydraulic engine
- Eliminate open circuit in
- Engine mounting
mounting permanently
wiring or short circuit
solenoid valve -N144 hard
or -N145 defective
=> Current Flow
- Electrohydraulic engine
Diagrams, Electrical Fault- Short to earth
mounting permanently
finding and Fitting
soft
Locations binder
Stored if engine control unit actuates engine mounting valves and current flow
at control unit input is too high
positive
- Short to positive
- Electrohydraulic engine
mounting permanently
hard
- Eliminate open circuit in
wiring or short circuit
=> Current Flow
Diagrams, Electrical Faultfinding and Fitting
Locations binder
Output on printer of V.A.G Possible cause of
Possible effects
Fault remedy
1551
trouble
01376
Rev signal for injection
pump
Defective
Stored if speed sender in injection pump supplies no or incorrect signals
- Replace injection
- Injection pump
- Engine cuts out (safety
pump
defective
shut-off)
=> Page 23-8
Output on printer of
Possible cause of trouble
Possible effects
Fault remedy
V.A.G 1551
01440
Fuel level signal
Open circuit/short to
Stored in the event of open circuit or connection to battery positive in wiring
positive
to dash panel insert
- Check fuel level
- Open circuit or short to
- Glow period warning
signal
positive in wiring
lamp flashes
=> Page 23-100
Stored in the event of connection to battery negative in wiring to dash panel
Short to earth
insert
- Check fuel level
- Glow period warning
- Short to earth in wiring
signal
lamp flashes
=> Page 23-100
Output on printer of
Possible cause of trouble Possible effects
Fault remedy
V.A.G 1551
01441
Fuel shortage sender G210
Open circuit/short to
Stored if low fuel level sender signal voltage is greater than 2.65 V
positive
- Open circuit or short to
- Glow period warning
- Check low fuel
positive in wiring
lamp flashes
level sender
- -G210 defective
Short to earth
Stored if low fuel level sender signal voltage is less than 0.5 V
- Short to earth in wiring
- Glow period warning
- Check low fuel
- -G210 defective
lamp flashes
level sender
Output on printer of
V.A.G 1551
01441
Fuel shortage sender
-G210
Implausible
signal
Possible cause of
trouble
Possible effects
Fault remedy
Stored if low fuel level sender signals "no fuel" but fuel level signal in dash panel
insert does not yet indicate need to refuel
- Glow period
- Check fuel pump
warning lamp
- Baffle housing not
Check filling of baffle housing
flashes
filled although sufficient
=> Fuel Supply System - Diesel
- Engine cuts out
fuel in tank
Engine; Repair Group 20; Fuel
due to air in fuel
Supply23-17
system
- -G210 defective
- Check fuel level signal
- Fuel level signal not
OK
Output on
printer of V.A.G
1551
01442
Misfiring due to
lack of fuel
Possible cause of
trouble
=> Page 23-100
Possible effects
Fault remedy
Stored if baffle housing in tank is empty
- Fault "01441
Implausible signal"
never stored
- Tank empty
- Fill tank with fuel
- Misfiring
- Engine cuts out due
to tank empty
- Fault "01441
- Check fuel pump
- Baffle housing not
Implausible signal"
Check filling of baffle housing
filled although sufficient
stored
=> Fuel Supply System - Diesel
fuel in tank
- Engine cuts out due
Engine; Repair Group 20; Fuel
to air in fuel system
Supply23-17
Output on printer of
Possible cause of Possible
Fault remedy
V.A.G 1551
trouble
effects
01613
Pump relay, fuel cooling
Output not
Stored if engine control unit actuates fuel cooling pump relay and current
switched/short to
flow at control unit input is too high
positive
- Check wiring
- Reduced
=> Current Flow Diagrams,
- Short to positive
power output
Electrical Fault-finding and Fitting
Locations binder
Open circuit/short to
Stored if engine control unit does not actuate fuel cooling relay and voltage
earth
is not applied to control unit input
- Open circuit in
- Reduced
- Check wiring
wiring
power output
- Short to earth
=> Current Flow Diagrams,
- Fuel cooling
Electrical Fault-finding and Fitting
pump relay
Locations binder
defective
Possible
Output on printer of
cause of
Possible effects
Fault remedy
V.A.G 1551
trouble
01686
Radiator fan run-on control
unit -J138
Open circuit/short to
Stored if engine control unit does not actuate radiator fan run-on control unit
earth
and voltage is not applied to control unit input
- Eliminate open circuit in wiring or
- Open circuit in
short circuit
wiring
- No fan run-on
=> Current Flow Diagrams,
- Relay
Electrical Fault-finding and Fitting
defective
Locations binder
- Radiator fan
- Short to earth
permanently on
Output not
Stored if engine control unit actuates radiator fan run-on control unit and
switched/short to
current flow at control unit input is too high
positive
- Eliminate open circuit in wiring or
- Short to
- No fan run-on
short circuit
positive
=> Current Flow Diagrams,
Electrical Fault-finding and Fitting
Locations binder
Output on printer of
V.A.G 1551
01695
Fuel temperature
sender 2 -G248
Short to earth
Possible cause of
trouble
Possible
effects
Stored if fuel temperature sender 2 signal voltage is less than 4.1 V
- No
- Short to earth
noticeable
- Check wiring
effects
=> Current Flow Diagrams, Electrical
- Fuel temperature
Fault-finding and Fitting Locations
sender 2 defective
binder
Open circuit/short
to positive
Stored if fuel temperature sender 2 signal voltage is greater than 4.7 V
- Open circuit in wiring
- No
noticeable
effects
Deactivated
Output on
printer of
V.A.G 1551
Possible cause
of trouble
- Check wiring
=> Current Flow Diagrams, Electrical
Fault-finding and Fitting Locations
binder
- Short to positive
Output on printer
of V.A.G 1551
17583 P1175
Pre-injection
Fault remedy
Possible
effects
Fault remedy
Stored if pre-injection is deactivated due to implausible values
- Petrol or
biodiesel in tank
- Check whether petrol or biodiesel has been put
- Water in fuel
in the tank; if this is the case: Drain tank and fill
- Fuel pressure
with diesel fuel, erase fault memory, perform test
- Noisy
too low
drive and then interrogate fault memory again
engine
- Return pipe
Drain fuel filter
running
damaged
=>Page 23-22
- Mechanical
Check for clogged or kinked return pipe
fault in injection
Test sequence is continued in next table
pump
Possible
cause of
trouble
Possible
effects
Fault remedy
- Replace flow restrictor1) in return pipe
Read measured value block 18, display zone 1 (at least 11
Volts); all bits should be at 0 in display zone 3. If both
readouts are OK, erase fault memory, road-test vehicle and
interrogate fault memory again. If fault is stored again, replace
injection pump=>Page 23-8
1)
Flow restrictor is integrated into banjo bolt of return pipe.
If banjo bolt (with Bosch part number 1 467 445 003) has already been fitted, injection pump must be
replaced=>Page 23-8.
Output on printer of
V.A.G 1551
17931 P1523
Crash signal from
airbag CU
Implausible
signal
Possible cause of
trouble
Possible effects
Fault remedy
Stored if wiring to airbag control unit is defective
- Open circuit in
wiring/short circuit
- Check crash signal =>Perform
final control diagnosis in airbag
control unit
Check wiring
=> Current Flow Diagrams,
Electrical Fault-finding and
Fitting Locations binder
17978 P1570
Engine control unit
blocked
Output on printer of
V.A.G 1551
18017 P1609
Crash switch-off
Triggered
Output on printer of
V.A.G 1551
18033 P1625
Drive train data bus
Implausible
message from
gearbox CU
Stored if ignition switched on but engine control unit did not receive start
authorisation from immobilizer
- Attempted
manipulation
- Check electronic immobilizer
- Engine starts and
- Immobilizer not
=> Electrical System; Repair
immediately cuts out
adapted
Group 96; Servicing electronic
again
- Immobilizer
immobilizer
defective
Possible
Possible cause of trouble
Fault remedy
effects
Stored if engine control unit informed of airbag triggering by airbag control
unit
- Final control diagnosis performed in
- Engine cuts
- Erase fault
airbag control unit
out
memory
- Accident involving airbag triggering
Possible cause of
Possible effects
Fault remedy
trouble
Stored in the event of problems with information exchange between engine
and gearbox control units via signal wire
- Open circuit in
wiring to gearbox
control unit
18034 P1626
Drive train data bus
No message from
gearbox CU
Output on printer of
V.A.G 1551
18044 P1636
Drive train data bus
No message from
airbag CU
- Gearbox in
emergency running
mode
- Check wiring
=> Current Flow Diagrams,
Electrical Fault-finding and
Fitting Locations binder
Stored in the event of problems with information exchange between engine
and gearbox control units via signal wire
- Open circuit in
- Gearbox in
- Check CAN bus
wiring to gearbox
emergency running
=> Page 23-101
control unit
mode
Possible cause of trouble
Possible effects
Fault remedy
Stored in the event of problems with information exchange between engine
and airbag control units via signal wire
- Check CAN
- Open circuit in wiring to airbag
bus
control unit
=> Page 23101
18056 P1648
Drive train data bus
Hardware defective
Stored if information exchange between all control units via CAN bus is no
longer possible
- Check CAN
- Open circuit in wiring or short to
- Engine running
bus
earth/positive
problems
=> Page 23-
101
Output on printer of
V.A.G 1551
18057 P1649
Drive train data bus
Message from
ABS control unit
missing
Possible cause
of trouble
Fault remedy
Stored in the event of problems with information exchange between engine and
ABS control units via signal wire
- Open circuit in
wiring to ABS
control unit
18058 P1650
Drive train data bus
Message from
dash panel insert
missing
Possible effects
- Traction control
(TCS) warning
lamp lights
- No TCS function
- Check CAN bus
=> Page 23-101
Stored in the event of problems with information exchange between engine
control unit and dash panel insert via signal wire
- Open circuit in
wiring to dash
panel insert
- Check drive train data bus adaption
in dash panel insert
=> Electrical System; Repair Group
01; Starting self-diagnosis of dash
panel insert; Adaption23-101
Output on printer of
Possible cause of
Possible effects
Fault remedy
V.A.G 1551
trouble
18062 P1654
Interrogate fault memory
of dash panel insert
- Fault in dash
- Locate and eliminate cause of
panel insert
trouble in dash panel insert
18259 P1851
Drive train data bus
Message from
Stored in the event of problems with information exchange between engine and
ABS control unit
ABS control units via signal wire
missing
- Traction control
- Check wiring
- Open circuit in
(TCS) warning lamp
=> Current Flow Diagrams,
wiring to ABS
lights
Electrical Fault-finding and
control unit
- No TCS function
Fitting Locations binder
65535
- Engine running
- Internal fault in
- Replace engine control unit =>
Control unit defective
problems
control unit
Page 23-42
- Engine cuts out
Final control diagnosis
Final control diagnosis
The final control diagnosis function actuates the following components in the stated sequence:
1. Glow plug relay (-J52)
2. Glow period warning lamp (-K29)
3. Radiator fan run-on control unit (-J138)
Or blower relay (-J323)

‒ Connect up vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G
1551 and select engine electronics control unit with "address word" 01=>Page 01-8.
Ignition must be on.
→ Indicated on display:
Rapid data transfer
HELP
Select function XX

‒ Press keys 0 and 3 for "Final control diagnosis" function.
→ Indicated on display:
Rapid data transfer
Q
03-Final control diagnosis
Checking glow plug relay

‒ Confirm entry with Q key.
→ Indicated on display:
Final control
diagnosis ⇒
Glow plug relay J52
Relay must click.
On account of the high current input of the glow plugs, relay
energisation/deenergisation can also be seen from interior lighting becoming
brighter/dimmer.
If relay does not click:

‒ Check glow plug relay.
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
Checking glow period warning lamp

‒ Press ⇒key.
→ Indicated on display:
Final control diagnosis
⇒
Glow period warning lamp -K29
Warning lamp must flash.
If warning lamp does not flash:

‒ Check glow period warning lamp => Page 28-3.
Checking radiator fan run-on control unit

‒ Press ⇒key.
→ Indicated on display:
Final control diagnosis
⇒
Radiator fan run-on control unit -J138
or
→ Indicated on display:
Final control
diagnosis ⇒
Blower relay J323
Radiator fan must start up every 2 seconds and then stop again.
Note:
Temperature conditions may also cause radiator fan to be actuated by thermo
switch, automatic gearbox or air conditioner. When performing final control
diagnosis, make sure actuation does not result from the above.

‒ Allow engine to cool down if necessary.
If radiator fan is not actuated:

‒ Check radiator fan run-on control unit -J138.
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder

‒ Press ⇒key.
→ Indicated on display:
Rapid data transfer
HELP
Select function XX
Basic setting
Basic setting
Test conditions




● Coolant temperature at least 80°C
● Electr. loads switched off
● Air conditioner off
● Selector lever set to P or N
Test sequence

‒ Connect up vehicle diagnostic, testing and information system VAS 5051=>Page 01-3 and
select vehicle system "01 - Engine electronics" from list. Ignition must be on.
Or, depending on desired operation:

‒ Start engine.
→ Indicated on VAS 5051:

‒ From list -1- select diagnostic
function "04 - Basic setting".
→ Indicated on VAS 5051:


1-
Enter display group
‒ Use keypad -2- to enter
required three-digit display
group number and confirm
entry by touching Q key.
Example:

‒ Enter "001" for "Display
group number 001" and
confirm by touching Q key.
→ Indicated on VAS 5051:




1 - Measured values not in
basic setting
2 - Measured values in
basic setting
3 - Display group X
A - Activate basic setting
Note:
Basic setting is initiated after touching
key -A-.
→ Indicated on VAS 5051:





1234-
Display zone 1
Display zone 2
Display zone 3
Display zone 4
‒ Terminate function "04 - Basic setting" by
touching ◂ key.
Display group 03 at idle
This display group is used for checking exhaust-gas
recirculation. The exhaust-gas recirculation valve N18 is alternately opened and closed for 10
seconds at a time.
=> 6-cyl. TDI Engine, Mechanics; Repair Group 26;
EGR System; Checking exhaust gas recirculation
valve -N18
System in basic setting 3
1000
rpm
EGR
active
169
mg/S
⇒
◂ Indicated
on display
0
%
Duty cycle
(actuation) of
EGR valve
Intake air mass
EGR valve (-N18) open
Engine speed
System in basic setting 3
100
0
rpm
EGRn.acti
ve
415
mg/
S
⇒
◂
Indicated
on
display
10
0
%
Duty
cycle
(actuatio
n) of
EGR
valve
Intake air mass
EGR valve (-N18)
closed
Engine speed
Display group 04 at idle
This display group is used for checking injection
timing control. The injection timing control is
alternately advanced and retarded for 10 seconds.
System in basic setting 4
85
0
rp
m
Advanc
ed
15.4
°bef.T
DC
⇒
◂ Indicated
on display
2
9
%
Duty cycle
(actuation)
of
commence
ment of
injection
valve
Commencement
of injection: At
least 12 °before
TDC OK
Commencement of
injection valve (-N108) is
actuated until specification
of at least
12 °before TDC is attained
Engine speed
System in basic setting 4
85
0
rp
m
Retard
ed
1.2
°aft.T
DC
⇒
◂ Indicated
on display
10
0
%
Duty cycle
(actuation)
of
commence
ment of
injection
valve
Commencement
of injection 4 °
after TDC...0 °
after TDC OK
Commencement of injection
valve (-N108) open
Engine speed
Display group 11 at idle
This display group is used for checking charge
pressure control. The charge pressure control
solenoid valve -N75 is alternately opened and
closed for 10 seconds at a time.
=> 6-cyl. TDI Engine, Mechanics; Repair Group 21;
Checking charge air system with turbocharger;
Checking charge pressure control solenoid valve N75
System in basic
setting 11
1000
1040
On
rpm
mbar
⇒
◂ Indicated on
display
100
%
Actuation of
charge
pressure
control
solenoid valve
Charge pressure
Charge pressure control
solenoid valve open
Engine speed
System in basic
setting 11
1000
rpm
Off
979
mbar
⇒
◂ Indicated on
display
0
%
Actuation of
charge
pressure control
solenoid valve
Charge pressure
Charge pressure control
solenoid valve closed
Engine speed
Encoding control unit
Encoding control unit
Control unit must be encoded as
follows if code displayed does not
correspond to vehicle or if control unit
has been replaced.

‒ Connect up vehicle
diagnostic, testing and
information system VAS
5051=>Page 01-3 and select
vehicle system "01 - Engine
electronics" from list. Ignition
must be on.
→ Indicated on VAS 5051:

‒ From list -1- select diagnostic
function "07 - Encoding control
unit".
→ Indicated on VAS 5051:


1-
Enter code word
‒ Use keypad -2- to enter
control unit encoding as per
encoding table => Page 01-98.
Example of code number composition:
Audi A8
Not used
Emission standard
EU III D
Front-wheel drive
and manual
gearbox
Code number
00
0
1
2
00
0
1
2

‒ Confirm entry by touching Q
key.
→ Indicated on VAS 5051:


1-
Encoding in progress
‒ Wait until next display
appears.
→ Indicated on VAS 5051:



1 - Vehicle system encoding completed
2 - Control unit identification with new code
o (old code in brackets)
‒ Terminate function "07 - Encoding control
unit" by touching ◂ key.
Encoding options
Vehicle
model
0
Au
0
di
=
A8
0
1
=
---
0
2
=
---
0
3
=
---
0
4
=
Not
used
0
=
Displ
ay 0
Country/Emis
sion standard
0
0=
EU II
--=
1
1
---
1=
EU III D
=
=
2
2
---
2=
---
=
=
3
3
---
3=
=
=
4
4
---
=
Gearbox
4=
--=
Automat
ic
gearbox
, frontwheel
drive
with/with
out ESP
Manual
gearbox
Frontwheel
drive
with/with
out ESP
Manual
gearbox
Fourwheel
drive
without
ESP
Automat
ic
gearbox
Fourwheel
drive
without
0
5
=
---
5
0
6
=
---
5
---
5=
---
=
=
6
6
---
6=
---
=
=
ESP
Manual
gearbox
Fourwheel
drive
with
ESP
Automat
ic
gearbox
Fourwheel
drive
with
ESP
New code on replacing the following engine control
units:
Old
engine
control
unit
New
engine
control
unit
Code
4D0 907
401 B
4D0 907
401 N
00301
00402
00504
4D0 907
401 C
4D0 907
401 M
00312
4D0 907
401 G
4D0 907
401 N
00001
00102
00204
Model
Automatic
gearbox with
front-wheel drive
Manual gearbox
with front-wheel
drive
Automatic
gearbox with
four-wheel drive,
no ESP
Manual gearbox
with front-wheel
drive
Automatic
gearbox with
front-wheel drive
Manual gearbox
with front-wheel
drive
Automatic
gearbox with
four-wheel drive,
no ESP
New code on replacing the following engine control
units:
Old
engine
control
unit
4D0 907
401 H
New
engine
control
unit
4D0 907
401 M
Code
Model
00001
Automatic
gearbox with
00102
4D0 907
401 J
4D0 907
401 M
00206
front-wheel drive
Manual gearbox
with front-wheel
drive
Automatic
gearbox with
four-wheel drive,
with ESP
Note:
The abbreviation "ESP" stands for Electronic Stability
Program.
Reading measured value blocks
Reading measured value blocks
Safety precautions
Pay attention to the following if testers and measuring instruments have to be used in the course of a test
drive:
Attention:

◆If measurements/tests have to be performed whilst driving, vehicle diagnostic, testing
and information system VAS 5051 or fault reader V.A.G 1551is always to be attached to
rear seat and operated from there.
If testers and measuring instruments were to be operated from front passenger's seat, person sitting there
could suffer injury in the event of an accident due to triggering of front passenger's airbag.
Test requirements:




● Coolant temperature at least 80 °C
● Electr. loads switched off (radiator fan must not run during test)
● Air conditioner switched off
● Selector lever set to P or N
Test sequence

‒ Connect up vehicle diagnostic, testing and information system VAS 5051=>Page 01-3 and
select vehicle system "01 - Engine electronics" from list. Ignition must be on.
Or, depending on desired operation:

‒ Start engine.
→ Indicated on VAS 5051:

‒ From list -1- select diagnostic
function "08 - Reading
measured value block".
→ Indicated on VAS 5051:


1-
Enter display group
‒ Use keypad -2- to enter
required three-digit display
group number and confirm
entry by touching Q key.
Note:
The display group to be selected can
be seen from the respective functional
tests and component checks.
→ Indicated on VAS 5051:



1 - Read measured value block
2 - Display zone 1
o Display zone 2
o Display zone 3
o Display zone 4
3 - Display group X
Notes:


◆Display remains blank if a display zone is not used.
◆Proceed as follows to switch to a different display
group:
Display group
Up
Down

VAS 5051
Press s key
Press t key
‒ Terminate function "08 - Reading measured value block"
by touching ◂ key.
List of display groups
Display
group
number
Indicated on
display
Designation
Reading
measured
value block 0
12345678
9 10
00
General
1
=
Engine speed
2
=
Commencement of
injection
3
=
Accelerator position
4
=
5
=
6
=
7
8
9
10
=
=
=
=
Injection quantity
Intake manifold
pressure (charge
pressure)
Atmospheric pressure
(ambient pressure)
Coolant temperature
Intake air temperature
Fuel temperature
Intake air mass
Reading
measured
value block 1
1
=
Engine speed
1234
2
=
Injection quantity
3
=
4
=
vehicle
check
01
Injection
quantity
Actuation time of
quantity adjuster
solenoid valve
Coolant temperature
Displa
y
group
numb
er
Indicat
ed on
display
02
Readin
g
measur
ed
value
block 2
1
=
Engine speed
Idling
speed
1234
2
=
Accelerator position
3
=
Operating status:
Designation
X
X
X
X
1
X
X
X
1
X
X
X
1
X
X
X
1
X
X
X
1
X
X
X
X
Air
condition
er
compress
or on
Ignore
Idling
speed
switch
closed
Kickdown
switch
closed
High
idling
speed on
account
of:
▪ Request
from air
condition
er
▪
Accelerati
on and
braking
detected
▪ System
fault
detected
Display group
number
03
Exhaust gas
recirculation
04
Commencement
of injection
05
Starting
conditions
Disp
lay
grou
p
num
ber
Indic
ated
on
displ
ay
06
Readi
ng
meas
4 = Coolant temperature
Indicated
Designation
on display
Reading
measured
1 = Engine speed
value block
3
Intake air mass
1234
2 =
(specified)
Intake air mass
3 =
(actual)
Duty cycle
4 = (actuation) of EGR
valve -N18
Reading
measured
1 = Engine speed
value block
4
Commencement of
1234
2 =
injection (specified)
Commencement of
3 =
injection (actual)
Duty cycle
(actuation) of
4 = commencement of
injection valve N108
Reading
measured
1 = Engine speed
value block
5
Starting injection
1234
2 = quantity (stored
from last start)
Commencement of
3 =
injection
4 = Coolant temperature
Designation
1 = Vehicle speed
ured
value
block
6
Swit
ch
posit
ions
123
4
2 = Brake pedal monitoring:
Brake light
switch -F
closed
Brake pedal
X
1
X switch -F47
open
Clutch pedal
switch -F36
open
1
X
X (displayed for
vehicles with
manual
gearbox only)
Cruise control system (CCS) operating
3 =
element:
X X X X X 1 CCS on
CCS off with
X X X X 1 X
memory
X X X 1 X X Deceleration
Reactivation/a
X X 1 X X X
cceleration
Brake pedal
X 1 X X X X
pressed
Clutch pedal
pressed
(displayed for
1 X X X X X
vehicles with
manual
gearbox only)
X
Displa
y
group
numbe
r
Indicate
d on
display
06
Reading
measure
d value
block 6
Switch
position
s
1234
X
1
Designation
4
=
Cruise control system operating
status:
0
1
2
4
Control
unit with
cruise
control
system
CCS off
Cruise
control
system on
Acceleratio
n
Decelerati
on
8
Display group
number
07
Temperatures
08
Injection
quantity
limitation
09
Injection
quantity
limitation
Indicated
on display
Reading
measured
value block
7
1234
1234
1
6
2
4
8
2
5
5
Fuel temperature
2
=
3
=
4
=
Oil temperature
Intake air
temperature
Coolant temperature
1
=
Engine speed
3
=
4
=
Reading
measured
value block
9
1
=
1234
2
=
3
=
4
=
Reading
measured
value block 10
2
=
=
10
3
1
2
Indicated on
display
6
Designation
Reading
measured
value block
8
Display
group
number
1
Reactivatio
n
Brake
pressed
Maintain
vehicle
speed
Ignore
Ignore
Control
unit with
no CCS
function
Desired injection
quantity (specified by
driver via accelerator
pedal)
Injection quantity
limitation via engine
speed (torque
limitation)
Injection quantity
limitation on account
of intake air mass
(avoidance of
smoke)
Desired injection
quantity (specified by
driver via accelerator
pedal)
Injection quantity
limitation by
automatic gearbox
during gearshift
Injection quantity
based on overrun
torque limitation
Injection quantity
limitation by traction
control system
Designation
1
=
Intake air mass
Air
quantities
11
Charge
pressure
control
12
Glow plug
system
2
=
3
=
4
=
Atmospheric pressure
(ambient pressure)
Intake manifold
pressure (charge
pressure)
Accelerator position
Reading
measured
value block 11
1
=
Engine speed
1234
2
=
Charge pressure
(specified)
3
=
4
=
Reading
measured
value block 12
1
=
Display can be ignored
1234
2
=
Glow period (seconds)
3
=
4
=
1234
Display group
number
13
Idling speed
smooth running
control
14
Idling speed
smooth running
control
15
Fuel
consumption
Indicated on
display
Reading
measured
value block
13
1234
Reading
measured
value block
14
1234
Charge pressure
(actual)
Duty cycle (actuation)
of charge pressure
control solenoid valve N75
Control unit power
supply
Coolant temperature
Designation
1
=
2
=
3
4
=
=
Difference in
injection quantity
between cylinder 3
and cylinder 2
Difference in
injection quantity
between cylinder 1
and cylinder 2
No display
No display
1
=
No display
Difference in
injection quantity
between cylinder 6
and cylinder 2
Difference in
injection quantity
between cylinder 4
and cylinder 2
Difference in
injection quantity
between cylinder 5
and cylinder 2
2
=
3
=
4
=
Reading
measured
value block
15
1
=
Engine speed
1234
2
=
Injection quantity
(actual)
3
=
4
=
Displ
ay
grou
p
num
ber
Indica
ted on
displa
y
16
Readi
ng
measu
red
value
block
16
No display
Readi
ng
measu
red
value
block
17
No display
Fuel consumption
Desired injection
quantity (specified
by driver via
accelerator pedal)
Designation
Not
used
17
Not
used
18
Readi
ng
measu
red
value
block
18
1234
1
=
Injection pump power supply
2
3
=
=
Engine control unit power supply
Information from injection pump
Quantity
adjuster
solenoid
X X X X X X 1 valve
permanentl
y
energised
Quantity
adjuster
X X X X X 1 X solenoid
valve
defective
Injection
pump
X X X X 1 X X speed
sender
defective
Injection
timing
X X X 1 X X X
control
defective
Commence
X X 1 X X X X
ment of
X
X
X
X
X
Display
group
number
181)
19
Starting
conditions
X
X
1
X
X
X
X
X
X
1
X
X
X
X
X
X
1
X
X
X
X
X
X
X
Indicated
on
display
Reading
measured
value
block 18
1234
injection
not
detected
Cut-out
signal set
Engine
speed not
detected
Signal wire
defective
Designation
Evaluation of pulses from
engine speed sender; pulses
are expected in injection
pump alternately within and
outside specific segments
One pulse
outside and
0 0 0 0 one within
detected,
OK
No pulse
X X X 1 outside
segment
Several
pulses
X X 1 X
outside
segment
No pulse
X 1 X X within
segment
Several
pulses
1 X X X
within
segment
4
=
Reading
measured
value
block 19
1
=
Engine speed
1234
2
=
Commencement of injection
3
=
4
=
(stored)
Actuation time of quantity
adjuster solenoid valve
Fuel temperature
1) Only displayed by engine control unit as of a certain data
level.
Display
group
numbe
r
Indicat
ed on
display
20
Readin
g
measur
ed
Designation
1
=
Ambient temperature
value
block
20
Addition
al
heater
1234
Displa
y
group
numb
er
Indicate
d on
display
21
Reading
measur
ed value
block 21
Fuel
quantit
y
2
=
3
=
4
=
Additional heater fuel
consumption
Additional heater shut off on
account of:
Engine
speed
X X
X 1
less than
600 rpm
Engine
start
X X
1 X within last
10
seconds
No
request to
engine
control
X 1
X X
unit (e.g.
ECON
button
pressed)
Ambient
temperat
ure
1 X
X X
greater
than +5
°C
Coolant temperature
Designation
1
=
1234
2
=
Operating status of fuel quantity
diagnosis
Low fuel
level
1 0 0 sender:
Tank
empty
Low fuel
level
sender:
0 1 0
Tank
almost
empty
Warning
signal
from dash
0 0 1
panel
insert:
Refuel
Status of injection system
Engine
1 0 0 0 0
off, no
3
=
0
1
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
1
Fuel pump actuated:
With
engine
running
For
approx. 6
seconds
0 1
after
ignition
on
Operating status of fuel quantity
diagnosis
Deactivat
ed due to
1
system
fault
1
4
=
more fuel
Engine
cuts out
after
starting
due to
insufficien
t fuel
Engine
prevented
from
starting
due to no
fuel in
tank
Engine
misfiring
Standby
for cut-out
0
Display
group
number
Indicated on
display
25
Reading
measured value
block 25
1
=
1 2 3 45
2
=
3
4
5
=
=
=
Injection pump
number (refer also to
Parts List)
Software version
Serial number
Date of manufacture
Reading
measured value
block
1
=
Gearbox control unit
1234
2
=
ABS control unit
3
4
=
=
Dash panel insert
Airbag control unit
Injection
pump
125
Drive train
data bus
Designation
Data level
Display group 00 at idle (engine warm, coolant temperature
not below +85 °C)
⇒
Reading measured value block 0
3
4
7
2
0
1
6
9
7
20
8
5
9
19
1
12
7
◂Indicat
ed on
display
5
4
Intake
air
mass:
50...70
OK
▪ If
outside
toleranc
e =>
Display
group
03,
Page
01-130
Fuel
temperature:
No
specification
Intake manifold
temperature: No
specification
Coolant temperature:
80...45 OK
▪ Greater than 80: Warm
up engine
Ambient pressure: No
specification
Charge pressure: Ignore
Injection quantity: 10...30 OK
▪ If outside tolerance => Display group
01, Page 01-122
Accelerator pedal position: 0
Commencement of injection: 51...88 OK
▪ If outside tolerance => Display group 04, Page
01-123
Idling speed: 32...36 OK
▪ If outside tolerance => Display group 02, Page 01126
Display group 00 at full throttle (test drive in 3rd or 4th gear,
coolant temperature not below +85 °C)
Engine code letters AFB, AKN
Attention: Attach fault reader to rear seat and operate it from
there. Heed test drive safety precautions =>Page 23-1.
Reading measured value block 0
⇒
◂Indic
ated
on
displa
y
15
6
14
7
2
5
5
1
2
4
2
0
8
2
0
8
5
9
1
9
1
1
2
9
2
1
1
Intake
air
mass:
Greate
r than
185
OK
▪ Less
than
185:
=>
Displa
y
group
10,
Page
01134
Fuel
temperatur
e: No
specificatio
n
Intake manifold
temperature: No
specification
Coolant temperature:
80...45 OK
▪ Greater than 80:
Warm up engine
Ambient pressure: Ignore
Charge pressure: 187...215 OK
▪ If outside tolerance => Display
group 11, Page 01-135
Injection quantity: 113...127 (full
throttle injection quantity) OK
▪ If outside tolerance => Interrogate
fault memory, Page 01-13
Accelerator pedal: 255 (floored)
Commencement of injection: Greater than 115
OK
▪ If outside tolerance => Display group 04,
Page 01-124
Engine speed: 140...170 (do not exceed 4000 rpm,
breakaway speed)
Display group 00 at full throttle (test drive in 3rd or 4th gear,
coolant temperature not below +85 °C)
Engine code AKE
Attention: Attach fault reader to rear seat and operate it from
there. Heed test drive safety precautions =>Page 23-1.
⇒
Reading measured value block 0
15
6
14
7
2
5
5
1
3
2
2
0
8
2
0
8
5
9
1
9
1
1
2
9
◂Indic
ated
on
displa
y
2
1
1
Intake
air
mass:
Greate
r than
200
OK
▪ Less
than
200:
=>
Displa
y
group
10,
Page
01134
Fuel
temperatur
e: No
specificatio
n
Intake manifold
temperature: No
specification
Coolant temperature:
80...45 OK
▪ Greater than 80:
Warm up engine
Ambient pressure: Ignore
Charge pressure: 200...230 OK
▪ If outside tolerance => Display
group 11, Page 01-135
Injection quantity: 130...150 (full
throttle injection quantity) OK
▪ If outside tolerance => Interrogate
fault memory, Page 01-13
Accelerator pedal: 255 (floored)
Commencement of injection: Greater than 120
OK
▪ If outside tolerance => Display group 04,
Page 01-124
Engine speed: 140...170 (do not exceed 4000 rpm,
breakaway speed)
Reading measured value blocks
Injection pump display specifications
Display group 19 on attempted starting (only if engine does not start)
Reading measured value block
19
310
0.7
35.7
rpm
°bef.TDC
°CS
◂ Indicated on display
⇒
14.3 °C
Fuel temperature
Actuation time of quantity adjuster solenoid valve
▪ Display increases in time increments: OK (pump providing
injection)
▪ 0 °crankshaft: Quantity adjuster solenoid valve closed, insufficient
cranking speed, refer to display zone 1
▪ =>Interrogate fault memory, Page 01-13
Commencement of injection
▪ 2.0 ° after TDC...4.7 ° before TDC: OK
▪ Later than 2.0 ° after TDC: Commencement of injection too late => Check
commencement of injection, Page 23-26
Cranking speed
▪ Less than 200 rpm and coolant temperature greater than 40 °C: Insufficient cranking
speed
▪ Injection pump is not actuated
▪ Low battery charge, starter defective
Note:
If all values are OK, but engine still does not start: Air in fuel system, injectors stuck open
Display group 01 at idle (engine warm, coolant temperature not below +85 °C)
Reading measured value
block 1
800
5.6
20.7
rpm
mg/S
°CS
⇒
◂ Indicated on display
87.3 °C
Coolant temperature
▪ 85...105 °C: OK
▪ Less than 85 °C: => Warm up engine
Actuation time of quantity adjuster solenoid valve
▪ 15...25 °crankshaft: OK
▪ Less than 15°CS: Injection pump setting too rich=>Replace injection
pump
▪ Greater than 25 °CS: Load on engine => Switch off loads, injection
pump setting too lean => Replace injection pump
Injection quantity
▪ 3.0...8.0 mg/S: OK
▪ Less than 3.0 mg/S: Injection pump setting too rich => Replace injection pump
▪ Greater than 8.0 mg/S: Load on engine => Switch off loads, injection pump
setting too lean => Replace injection pump
Engine speed
▪ 740...840 rpm: OK
Display group 04 at idle (engine warm, coolant temperature not below +85 °C)
Reading measured value block 4
800
rpm
2.0
°aft.TDC
1.6
°aft.TDC
◂ Indicated on display
⇒
73
%
Duty cycle (actuation) of commencement of injection
valve
▪ No specification
Instantaneous commencement of injection
▪ 2 ° after TDC...3 ° before TDC: OK
▪ Later than 2 ° after TDC: Commencement of injection valve
defective
Pump set to inject far too late
=> Check injection timing control range, Page 23-46
Specified commencement of injection requested by control unit
▪ 2 ° after TDC...3 ° before TDC: OK
Engine speed
▪ 740...840 rpm: OK
Display group 04 at full throttle (test drive in 3rd or 4th gear, coolant temperature not below +85
°C)
Engine code letters AFB, AKN
Attention: Attach fault reader to rear seat and operate it from there. Heed test drive safety
precautions =>Page 23-1.
Reading measured value block 4
4160
11.8
14.2
rpm
°bef.TDC
°bef.TDC
⇒
32
%
◂ Indicated on display
Duty cycle (actuation) of commencement of
injection valve
▪ No specification
Instantaneous commencement of injection
▪ As specified commencement of injection in display zone
2 (tolerance±2°) OK
▪ Outside tolerance: Injection pump commencement of
injection incorrect
=> Check commencement of injection, Page 23-46
Specified commencement of injection requested by control unit
▪ 8...12 °bef.TDC: OK
Engine speed
▪ 3800...4200 rpm: OK
Display group 04 at full throttle (test drive in 3rd or 4th gear, coolant temperature not below +85
°C)
Engine code AKE
Attention: Attach fault reader to rear seat and operate it from there. Heed test drive safety
precautions =>Page 23-1.
Reading measured value block 4
4160
12.8
14.2
rpm
°bef.TDC
°bef.TDC
⇒
32
%
◂ Indicated on display
Duty cycle (actuation) of commencement of
injection valve
▪ No specification
Instantaneous commencement of injection
▪ As specified commencement of injection in display zone
2 (tolerance±2°) OK
▪ Outside tolerance: Injection pump commencement of
injection incorrect
=> Check commencement of injection, Page 23-46
Specified commencement of injection requested by control unit
▪ 10...14 °bef.TDC: OK
Engine speed
▪ 3800...4200 rpm: OK
Reading measured value blocks
Engine idling display specifications
Display group 02 at idle (engine warm, coolant temperature not below +85 °C)
Reading measured value block 2
800 rpm
0.0 %
0 01 00
⇒
88.4 °C
◂ Indicated on display
Coolant temperature
▪ 85...100 °C: OK
▪ Less than 85 °C: => Warm up engine
Operating status
▪ 0 01 00: OK (idling-speed switch closed)
▪ 1 01 10: Air conditioner signal => Switch off air conditioner
Acceleration and braking detected => Check brake pedal switch
Additional heater on => Warm up engine
▪ 1 01 11: AC compressor signal => Switch off air conditioner
Accelerator position
▪ 0.0 %: OK
▪ Greater than 0.0 %: Accelerator pedal position sender incorrectly set or
defective
▪ => Adjust
Engine speed
▪ 740...840 rpm: OK
Display group 13 at idle
Reading measured value block 13
0.82 mg/S
-0.12 mg/S
⇒
◂ Indicated on display
No display
No display
- Difference in injection quantity between cylinders 3 and 1 and
cylinder 2
▪ -1.5 mg/S...+1.5 mg/S OK
▪ All display zones too high: Cylinder 2 more powerful
▪ All display zones too low: Cylinder 2 less powerful
Difference in injection quantity between cylinder 1 and cylinder 2
▪ -1.5 mg/S...+1.5 mg/S OK
▪ Greater than +1.5 mg/S: Cylinder 1 less powerful
▪ Less than 1.5 mg/S: Cylinder 1 more powerful
Difference in injection quantity between cylinder 3 and cylinder 2
▪ -1.5 mg/S...+1.5 mg/S OK
▪ Greater than +1.5 mg/S: Cylinder 3 less powerful
▪ Less than 1.5 mg/S: Cylinder 3 more powerful
Notes on display group 13 =>Page 01-129
Display group 14 at idle
Reading measured value block
14
0.79 mg/S
0.37 mg/S
⇒
◂ Indicated on display
-0.15
mg/S
- Difference in injection quantity between cyl. 6, 4 and 5
and cyl. 2
▪ -1.5 mg/S...+1.5 mg/S OK
▪ All display zones too high: Cylinder 2 more powerful
▪ All display zones too low: Cylinder 2 less powerful
Difference in injection quantity between cylinder 5 and
cylinder 2
▪ -1.5 mg/S...+1.5 mg/S OK
▪ Greater than +1.5 mg/S: Cylinder 5 less powerful
▪ Less than 1.5 mg/S: Cylinder 5 more powerful
Difference in injection quantity between cylinder 4 and cylinder 2
▪ -1.5 mg/S...+1.5 mg/S OK
▪ Greater than +1.5 mg/S: Cylinder 4 less powerful
▪ Less than 1.5 mg/S: Cylinder 4 more powerful
Difference in injection quantity between cylinder 6 and cylinder 2
▪ -1.5 mg/S...+1.5 mg/S OK
▪ Greater than +1.5 mg/S: Cylinder 6 less powerful
▪ Less than 1.5 mg/S: Cylinder 6 more powerful
No display
Notes on display group 14 =>Page 01-129
Notes on display groups 13 and 14:






◆The injection system features idling speed smooth running control. Differences in power
between the individual cylinders (component tolerances, injector delivery, compression, etc.) can
be detected and compensation provided by way of selective injection quantity metering at idle.
◆Detection takes place at idle by way of the signal from the engine speed sender, which
provides the control unit with six signals per crankshaft revolution. If the signals arrive at equal
intervals, all cylinders are providing the same power. If one cylinder is less powerful, the next 120
° crankshaft revolution will take longer. Conversely, a powerful cylinder will accelerate the
crankshaft to such an extent that less time is required.
◆If the control unit detects a difference, the cylinder concerned is immediately supplied with a
greater or lesser injection quantity until the engine runs smoothly again.
◆The measured value block displays the difference in injection quantity of the individual
cylinders as compared to cylinder 2 required for smooth engine idling.
◆+... mg/S: Cylinder concerned is less powerful than cylinder 2 and is therefore supplied with
more fuel
◆-... mg/S: Cylinder concerned is more powerful than cylinder 2 and is therefore supplied with
less fuel

◆Display groups 13 and 14 show the differences in injection quantity of cylinder banks 1 and 2
respectively. If there is an appreciable difference between the injection quantities of the cylinder
banks, check: Toothed belt tension, tensioning roller and injection timing
Reading measured value blocks
EGR display specifications
Display group 03 at idle (engine warm, coolant temperature not below +85 °C)
Reading measured value block 3
800
215
211
rpm
mg/S
mg/S
⇒
◂ Indicated on display
54 %
Duty cycle (actuation) of EGR valve
▪ No specification
Intake air mass
▪ As specified air mass in display zone 2 (tolerance ±20 mg/S):
OK
▪ Insufficient air mass: Unmetered air in intake system
Excessive exhaust gas recirculation => Check
▪ Excessive air mass: Insufficient exhaust gas recirculation =>
Check
Engine running for 10 min. at idle => Give brief burst of throttle
▪ Constant display: Substitute value => Interrogate fault
memory
Specified air mass requested by control unit
▪ 180...270 mg/S: OK
▪ Greater than 270 mg/S: Engine too cold => Warm up
Injection quantity too high => Injection pump display specifications
Intake air temperature very high (display group 7 zone 3) => No correction
possible
Engine speed
▪ 740...840 rpm: OK
Reading measured value blocks
Temperature sender display specifications
Display group 07 with ignition on (engine cooled down, not running)
Reading measured value block
7
15.4 °C
16.5 °C
15.9 °C
⇒
◂ Indicated on display
16.7
°C
Coolant temperature (at coolant temperature sender G62)
Intake air temperature (at intake-air temperature sender -G42)
Oil temperature (at oil temperature sender -G8)
Fuel temperature (at fuel temperature sender -G81)
Notes:


◆It is not possible to give temperature specifications.
◆Once the engine has cooled down, fuel, intake air, oil and coolant temperatures must roughly
correspond to ambient temperature. Check appropriate sender if there is a significant deviation.
Reading measured value blocks
Vehicle performance display specifications
Display group 08 at full throttle (test drive in 3rd or 4th gear, coolant temperature not below +85
°C)
Engine code letters AFB, AKN
Attention: Attach fault reader to rear seat and operate it from there. Heed test drive safety
precautions =>Page 23-1.
Reading measured value block 8
3490
rpm
43.6
mg/S
38.5
mg/S
⇒
◂ Indicated on display
42.9
mg/S
Injection quantity limitation on account of air mass
detected
Greater than 41 mg/S: OK
▪ Less than 41 mg/S: Insufficient air mass detected
▪ => Check air mass meter, Page 23-73
▪ Exhaust gas recirculation at full throttle
Injection quantity limitation based on engine speed (torque
limitation) 37...40 mg/S: OK
▪ Less than 37 mg/S: Engine speed too high or too low
▪ Greater than 40 mg/S: Increased injection quantity due to
tuning
Desired injection quantity (accelerator pedal position) greater than 41 mg/S
OK
▪ Less than 41 mg/S: Accelerator pedal not floored, incorrectly set or
defective => Check
Engine speed 2800...3500 rpm: OK
Display group 08 at full throttle (test drive in 3rd or 4th gear, coolant temperature not below +85
°C)
Engine code AKE
Attention: Attach fault reader to rear seat and operate it from there. Heed test drive safety
precautions =>Page 23-1.
Reading measured value block 8
3490
66.1
45.5
rpm
mg/S
mg/S
⇒
50.9
mg/S
◂ Indicated on display
Injection quantity limitation on account of air mass
detected
Greater than 48 mg/S: OK
▪ Less than 48 mg/S: Insufficient air mass detected
▪ => Check air mass meter, Page 23-73
▪ Exhaust gas recirculation at full throttle
Injection quantity limitation based on engine speed (torque
limitation) 42...47 mg/S: OK
▪ Less than 42 mg/S: Engine speed too high or too low
▪ Greater than 47 mg/S: Increased injection quantity due to
tuning
Desired injection quantity (accelerator pedal position) greater than 50 mg/S
OK
▪ Less than 50 mg/S: Accelerator pedal not floored, incorrectly set or
defective => Check
Engine speed 2800...3500 rpm: OK
Display group 10 at full throttle (test drive in 3rd or 4th gear, coolant temperature not below +85
°C)
Attention: Attach fault reader to rear seat and operate it from there. Heed test drive safety
precautions =>Page 23-1.
Reading measured value
block 10
832
1030
2070
mg/S
mbar
mbar
⇒
◂ Indicated on display
100
%
Accelerator pedal position: 100 %: OK
▪ Less than 100 %: Accelerator pedal not floored,
accelerator pedal position sender -G79 incorrectly set or
defective=>Check
Instantaneous charge pressure: 1900...2300 mbar: OK
Outside tolerance: Charge pressure control defective => Display
group 11, Page 01-135
Instantaneous atmospheric pressure: No specification
Intake air mass: Greater than 750 mg/S: OK
▪ Less than 750 mg/S: Engine speed less than 2000 rpm or greater than 4000 rpm
▪ Charge pressure too low => Observe display zone 3, unmetered air between air mass
meter and turbocharger, air mass meter defective
Reading measured value blocks
Charge pressure control display specifications
Display group 11 at full throttle (test drive in 3rd and 4th gear, coolant temperature not below +85
°C)
Attention: Attach fault reader to rear seat and operate it from there. Heed test drive safety
precautions =>Page 23-1.
Reading measured value block 11
3340
2121
2121
rpm
mbar
mbar
⇒
42
%
◂ Indicated on display
Duty cycle (actuation) of charge pressure control
solenoid valve -N75
Instantaneous charge pressure
▪ As specified charge pressure in display zone 2 (tolerance
±100 mbar): OK
▪ Insufficient charge pressure: No charge pressure control =>
Check
▪ Excessive charge pressure: Solenoid valve -N75 sticking
Charge pressure control hose detached or clogged
Linkage at turbocharger seized, pressure unit defective
=> Check charge pressure
Specified charge pressure requested by control unit
▪ 1900...2300 mbar: OK
Engine speed 2900...4000 rpm: OK
Adaption
Adaption
The adaption function permits alteration of


◆Idling speed
◆Glow period
within a specified range.

‒ Connect up vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G
1551 and select engine electronics control unit with "address word" 01=>Page 01-8.
Engine should be idling.
→ Indicated on display:
Rapid data
transfer HELP
Select function XX

‒ Press keys 1 and 0 for "Adaption" function and confirm entry with Q
key.
→ Indicated on display:
Adaption
Q
Enter channel number XX

‒ Enter desired channel number.
To change
Idling speed
Glow period

Channel
02
12
‒ Confirm entry with Q key.
→ Indicated on display:
Channel
2
Adaption 32768
⇒
%
800 rpm
0 01
0.0
00 18.4 5C
Adaption value can be altered in two ways:
Incrementing/decrementing
Adaption value can be decremented/incremented by pressing key 1
(3) on V.A.G 1551.
→ Indicated on display:
Channel
#1
Display group
Up
Down
V.A.G 1551
Press key 3
Press key 1
⇒
Adaption 32758
⇒
3%
V.A.G 1552
Press ↑key
Press ↓ key
→ Indicated on display:
Channel
2
790 rpm

Adaption 32768
2
0.0 %
0
01
00
‒ Confirm entry with Q key.
Direct adaption
Press ⇒ key and then enter new adaption value directly.
→ Indicated on display:
Channel
2
Adaption 32768
⇒
Enter adaption value XXXXX
→ Indicated on display:
Channel
2
Adaption 32768
Q
Enter adaption value 32788

‒ Confirm entry with Q key.
→ Indicated on display:
Channel
800 rpm

2
Adaption 32788
0.0 %
0
01
18.4 5C
‒ Confirm entry with Q key.
→ Indicated on display:
Channel
2
Adaption 32788
Store altered value?

00
Q
‒ Confirm entry with Q key.
→ Indicated on display:
Channel
2
Adaption 32788
⇒
Q
18.4 5C
Altered value stored

‒ Press ⇒key.
→ Indicated on display:
Rapid data transfer
Select function XX
HELP