Description
http://s2-audi.co.uk/tech_articles/motronic/ecu_faults.htm
The table below lists the ECU DTC (diagnostic trouble codes) and the corresponding
code generated by blink codes.
DTC
Blink Possible causes of
Code
fault
00000
No fault
recognised
Possible effects
Rectifying Fault
4444
If a complaint exists,
fault not recognised by self diagnosis
-
0000
-
-
1231
-A/C compressor
-Open Circuit in
does not cut out
wiring or short
in 1st gear at full
circuit from contact load
-Engine speed
50 at J220
to Speedometer
briefly drops below
G21 in dash panel
idling speed when
insert
disengaging clutch
-Speedometer
in overrun phase
-Engine speed
sender G22 faulty
-Speedometer G21 limited to 5300rpm
faulty
(only with USA
coding)
2111
-Metal swarf on G28
-Base of G28 loose
-Clearance from G28
to ring gear
of flywheel > 1.2mm
-Teeth at ring gear of
flywheel
broken off
-Open circuit in
wiring between
3 pin connector in
engine
compartment and
G28
-Open circuit in
wiring between J220
00000
-
End of output
00281
Road Speed
Signal (G68)
No signal
00513
Engine speed
sender (G28)
-Implausible
signal
-No signal
- Mechanical fault
-Engine does not
start
-Misfiring
-Engine cuts out
-Engine does not
start
-Test road speed
signal
-After repair,
perform brief road
test
-Test G28
-Rectify short
circuit or open
circuit
-Plug connectors
G4 & G28
correctly
and G28
-Short circuit
between contact 47
of
J220 and screening
or engine earth
-Open circuit in
screening of G28
-3 pin plug
connection of G28 &
G4
in engine
compartment mixed
up
-G28 faulty
-Input for G28 at
J220 faulty
(J220 faulty)
00514
Ignition timing
(G4)
-No signal
2112
-Base of G4 loose
-Clearance from G4
to pin
of flywheel > 1.2mm
-Pin on flywheel bent
or
broken off
-Open circuit in
wiring between
3 pin connector in
engine
compartment and
G4
-Open circuit in
wiring between J220
and G4
-Short circuit
between contact 49
of
J220 and screening
or engine earth
-Open circuit in
screening of G4
-3 pin plug
connection of G4 &
G28
in engine
compartment mixed
-Fault prior to
engine start or
attempt at starting:
engine does not
start
-Fault after engine
start: engine
continues running in
limp mode
-Engine does not
start
-Test G4
-Rectify short
circuit or open
circuit
-Plug connectors
G4 & G28
correctly
up
-G4 faulty
-Input for G4 at J220
faulty
(J220 faulty)
00515
Hall Sender
(G40)
-Open
circuit/short
cicuit to positive
2113
-Signal to positive
-Short circuit to
earth
-Signal to earth
-Mechanical fault
-Fault in basic
setting
-No supply voltage
for G40 from J220
-No earth for G40
-Open circuit in
signal wire to J220
or short to earth of
signal wire
-Short circuit
between contacts 8
& 12
at J220
-Open circuit in
wiring between 3 pin -Engine does not
plug connection in startr
engine compartment
abd J220
-Position of pin of G4
-G40 faulty
-Input for G40 in
-Poor performance
J220 faulty (J220
faulty)
-Toothed belt jumped
off
-Test G40
-Rectify short
circuit or open
circuit
-Check toothed
belt (camshaft
setting)
-Test G40
-Basic setting of
hall sender
-Check pin of G4
-Basic setting of hall
sender
-Pin of ignition timing
sender -G4 bent
or broken off
00516
Idling speed
switch (F60)
-Open
circuit/short
circuit
to positive
-Setting of F60
-Throttle valve
jamming
2121
-Closing damper
jamming or
incorrectly
set
-Idle speed control
moves to
open loop control
-Test F60 and
adjust
-Check closing
-A/C compressor is damper
switched off
-Short circuit to
earth
-Footmat resting on
accelerator pedal
-Accelerator cable
adjustment
-Open circuit in
wiring betwen F60
and
J220
-Input for F60 in
J220 faulty (J220
faulty)
-Cable from F60 to
J220 has short to
earth
-Moisture in throttle
valve connector
00518
Throttle Valve
Potentiometer
G69
-Open circuit /
short
circuit to
2212
positive
-Signal too large
-Short circuit to
earth
-Signal too small
-Implausible
signal
00519
Intake manifold
pressure sender
G71
2222
-Signal too small
-Signal too large
-Control
difference
-Idling speed not
within specified
range
-Adjust throttle
cable
-Rectify open
circuit in wiring
-Rectify short
circuit
-Open circuit or short
circuit
to positive in G69 or
in cable
connection between
G69 & J220
-Short circuit to earth
-Boost pressure is
in G69
not reached
or in cable
-Poor performance
connection between
G69 and J220
-G69 faulty
-J220 faulty
Moisture or corrosion
in plug connection
at G69
-Test G69
-Vacuum line from
intake manifold
to J220 interrupted,
blocked, kinked
or crimped
-Liquid seperator in
hose line from intake -Poor performance
manifold to J220 full
of liquid
-Blow off valve faulty
-Solenoid valve for
boost pressure
limiter
-Check / drain
vacuum lines of
liquid
seperator
-Test solenoid
valve for boost
pressure limiter
-Test
turbocharger
N75 faulty
-Pressure sensor in
Motronic control unit
J220 faulty
-Turbocharger faulty
00522
Coolant
temperature
sender G62
2312
-Short circuit to earth
-Moisture in
connector of G62
-Open circuit
between G62 and
J220
-Contact resistances
between G62 & J220
-G62 faulty
-Input of G62 in J220
faulty (J220 faulty)
-Cold starting
problems in very
cold temperatures
-Driving faults
during warm up
phase
-Test G62
2322
-Short circuit to earth
-Open circuit in
wiring between G42
& J220
-G42 faulty
-Input of G42 in J220
faulty (J220 faulty)
-Possible driving
faults in warm up
phase
at low
temperatures
-Test G42
-Corrosion in
connector
-G61 loose
-Open circuit in
wiring or short circuit
in wiring between
G61 & J220
-Short circuit
between G61 and
earth
or to screening
-G61 faulty
-Input for G61 in
J220 faulty (J220
faulty)
-High fuel
consumption
-Poor performance
-Boost pressure is
not reached
-Repair contacts
-Tightening torque
20Nm
-Rectify open or
short circuit
-Open circuit in
wiring to J220
-Probe heater not
-Exhaust not in
order
-Increased fuel
-Rectify open
circuit in wiring
-Test lambda
00523
Intake air
temperature
sender G42
-Short circuit to
earth
-Open circuit /
short
circuit to
positive
00524
Knock sensor #1
G61
2142
-No signal
00525
Lambda probe
G39
2343
operating
-Fuse #25 faulty
-Heating resistor in
probe faulty
-Wiring of probe
heater
-Short circuit of
signal wire to earth
-Short circuit of
signal wire to
screening
-Fuel tank empty (at
least 10 litres)
-Fuel system
pressure
-Failure of spark
plugs, ignition coils
and ignition output
stages
-Ingress of air to G70
-Leak in exhaust
system up to catalyst
-Faulty lambda probe
-Open circuit in earth
cable to contact 10
J220 to engine
block
-Short circuit to
positive
-No signal
-Short circuit to
earth
00528
Altitude sensor
F96
-Open circuit /
2223
short
circuit to positive
-Short circuit to
earth
00532
Supply Voltage
-Signal too large
-Signal too small
2234
consumption
-Formation of black
smoke
-Spark plugs soot
up
-Lambda control
moves to open loop
probe heater
-Basic setting of
engine with
VAG1551 /Vag
Com
-Short circuit to
positive in F96 or
in cable connection
between F96 & J220
-Short circuit to earth
-Poor performance -Test F96
in F96 or
-Boost perssure not -Test boost
in cable connection
reached
pressure
between F96 & J220
-F96 faulty
-Input for F96 in
J220 faulty (J220
faulty)
-Supply voltage
greater than 16 volts
-Alternator faulty
-Starting with two
series connected
batteries
-J220 destroyed
-Test voltage
-Idling speed not
within specified
range
-Voltage below 6
-Check battery
charge state
-Test voltage
supply
-Poor earth
connection to J220
-Battery discharged
-Current drain with
igntion off
00533
Idle speed control
-Adaptation limit
2231
esceeded
-Adaptation limit
-Adapatation limit
no reached
-Idling speed
stabilisation valve
N71 sticking
-Air mass meter G70
characteristic curve
shifted
-Contact resistance
at connector of N71
-N71 sticking in open
position
-G70 characteristic
curve shifted
-Ingress of air
betwen G70 an N71
-Throttle valve
potentiometer G69
incorrectly set
volts
-Engine not running
-Idling speed too
low
-Idling speed too
high
-Test N71
-Test G70
-Recify air leak
-Test G69and
adjust
-Engine vibrating
-Poor throttle
response
-Irregular Idling
-Test throttle body
valve
replace if
necessary
Throttle body valve
jamming
2341
-Fill up fuel tank
-Recify air leak
-Fuel tank empty at
-Test lambda
least 10 litres
probe
-CO upstream of
-Fuel system
catalyst less than
-Test fuel system
pressure too low
pressure
0.3%
-Failure of spark
-Check hose
plugs, ignition coils
connection intake
and ignition output
-Formation of black manifold/
stages
smoke
pressure
-Ingress of air to G70
-Spark plugs sooted regulator (fuel
-Leak in exhaust
-CO upstream of
shut off
system up to catalyst
valve on overrun
catalyst greater
-Faulty lambda probe
than 1%
-Check fuel return
-Fuel system
line of fouling,
pressure too high
kinking
and damage
2144
-Corrosion in
connector
-G66 loose
00537
Lambda sensor
control
-Control limit
exceeded
-Control limit not
reached
00540
Knock Sensor #2,
-High fuel
consumption
-Poor performance
-Repair contacts
-Tightening torque
20Nm
-Boost pressure is
-Open circuit in
wiring or short circuit not reached
between G66 and
J220
-Short circuit
between G66 and
earth
or to screening
-G66 faulty -Input for
G66 in J220 faulty
(J220 faulty)
G66
- No change in
signal
00543
Engine speed to
max exceeded
2214
Boost pressure to
maximum
exceeded
2224
-Implausible
signal
-Signal too large
00553
Air mass meter
G70
-Signal too large
-Signal too small
2324
-Engine speed
has exceeded
7200 RPM
as a result of an
operating fault
-Engine overrevs
(switching fault)
-Possible engine
damage
-Ingress of air
downstream of
turbocharger
-Blow off valve faulty
-Solenoid valve for
boost pressure
limiter
N75 faulty
-Leak in vacuum line
from inlet
manifold to J220 or
is disconnected
-Pressure sensor in
Motronic control
unit J220 is faulty
-Hard misfire at full
load
-Check
-Boost pressure too
connections
high
-Test blow off
valve
-Test solenoid
valve for boost
pressure limiter
N75
-Severe boost
-Test boost
pressure
pressure
fluctuations at full
load
-Open circuit in
wiring between G70
and J220
-Voltage supply to
G70 interrupted or
short
to earth
-Short to earth of
signal wire to J220
-Short circuit of
signal wire to J220
-G70 faulty
-Input for G70 in
-Slight handling
-Test G70
faults (performance)
-Signal too large
00544
-Rectify open or
short circuit
J220 faulty (J220
faulty)
00561
Mixture
adaptation
-Adaptation limit
(multiplicative)
exceeded
-Adaptation limit
(multiplicative)
not
reached
-Adaptation limit
(additive)
exceeded
-Adaptation limit
(additive) not
reached
2413
00577
Knock control cyl
#1
00578
Knock control cyl
#2
2141
00579
Knock control cyl
#3
-Control limit
exceeded
00580
Knock control cyl
#4
2143
00581
-Fuel system
pressure too low or
too high
-Failure of spark
plugs, ignition coils
and ignition output
stages
-Ingress of air to G70
-Leak in exhaust
system up to catalyst
-Incorrect signal from
air mass meter G70
-Poor fuel quality
(less than 91 RON)
-Open circuit in
signal wire from
engine
speed sender G28
or ignition timing
sender
G4 (loose contact,
sporadic fault) or
signal wire wrongly
connected
-Abnormal engine
noises (loose
ancilliary)
-Open circuit in
screening of G61
-Injector fouled
-Poor fuel quality
(less than 91 RON)
-Open circuit in
signal wire from
engine
speed sender G28
or ignition timing
-Increased fuel
consumption
-Formation of black
smoke
-Spark plugs sooted
up
-High fuel
consumption
-Poor performance
-Max speed is not
reached
-Boost pressure
reduction
-High fuel
consumption
-Poor performance
-Fill fuel tank
-Recify leak
-Test fuel system
pressure
-Test G70
-Replace J220
-Fill tank with at
least 91 RON
-Test G28 and G4
-Rectify open
circuit
-Replace injector
-Replace J220
-Fill tank with at
least 91 RON
-Test G28 and G4
Knock control cyl
#5
sender
G4 (loose contact,
sporadic fault) or
signal wire wrongly
connected
-Abnormal engine
noises (loose
ancilliary)
-Open circuit in
screening of G66
-Injector fouled
-Control limit
exceeded
01247
Solenoid valve 1
for
activated
charcoal
canister N80
-Short circuit to
positive in N80
or in the cable
connection between
N80 and J220
-Short circuit to
earth in N80
-Test N80
or in the cable
connection between
N80 and J220
-Thermofuse S75
faulty
-Open circuit in
wiring
4343
4411
-Short circuit to earth
-Open circuit in
wiring
-Fuse S28 faulty
-Engine does not
-Short circuit to
run smoothly
positive at
connector or in
injector
-Test injectors
-Check wiring &
fuse S28
4412
-Short circuit to earth
-Open circuit in
wiring
-Fuse S28 faulty
-Engine does not
-Short circuit to
run smoothly
positive at
connector or in
injector
-Test injectors
-Check wiring &
fuse S28
Injector cyl #1
N30
Injector cyl #2
N31
-Open
circuit/short
circuit to earth
-Short circuit to
positive
-Boost pressure
reduction
-Rectify open
circuit
-Replace injector
-Short circuit to
positive in N80 or in
the cable
connection between
N80 and J220
-Short circuit to earth
in N80 or in the cable
connection between
N80 and J220
-Thermofuse S75
faulty
-Open circuit in
wiring
-Short circuit to
positive
-Open
circuit/short
circuit
to earth
01249
-Open
circuit/short
circuit to earth
-Short circuit to
positive
01250
-Max speed is not
reached
01251
4413
-Short circuit to earth
-Open circuit in
wiring
-Fuse S28 faulty
-Engine does not
-Short circuit to
run smoothly
positive at
connector or in
injector
-Test injectors
-Check wiring &
fuse S28
4414
-Short circuit to earth
-Open circuit in
wiring
-Fuse S28 faulty
-Engine does not
-Short circuit to
run smoothly
positive at
connector or in
injector
-Test injectors
-Check wiring &
fuse S28
4421
-Short circuit to earth
-Open circuit in
wiring
-Fuse S28 faulty
-Engine does not
-Short circuit to
run smoothly
positive at
connector or in
injector
-Test injectors
-Check wiring &
fuse S28
4431
-Short circuit to
positive in N71 or in
cable connection
between N71 and
contact 4
of J220
-Short circuit to earth
in N71 or in
cable connection
between N71 and
J220
-Fuse S24 faulty
-Open circuit in
wiring
Injector cyl #3
N32
-Open
circuit/short
circuit to earth
-Short circuit to
positive
01252
Injector cyl #4
N33
-Open
circuit/short
circuit to earth
-Short circuit to
positive
01253
Injector cyl #5
N83
-Open
circuit/short
circuit to earth
-Short circuit to
positive
01257
Idle speed
Stabilisation
Valve N71
-Short circuit to
positive
-Open circuit /
short
circuit to earth
-At engine
operating
temperature idling
speed differs from
specification
(800+rpm)
-With cold engine,
engine may cut out -Test N71
-In emergency
running mode,
idling speed
1100-1200rpm
when warm
-A/C compressor
cuts out when idling
-Irregular idling
speed
4442
-Short circuit to
positive in N75 or in
cable connection
between N75 and
contact 23
of J220
-Short circuit to earth
in N75 or in
cable connection
between N75 and
J220
-Fuse S24 faulty
-Open circuit in
wiring
1111
-Engine does not
-Earth connection to
start
-Test earth
J220 contacts
-With ignition on, no connection of
10,14,19,24
voltage at contact J220
-Control unit faulty
37 of J220
01262
Solenoid valve
for boost
pressure limiter
N75
-Short circuit to
positive
-Open circuit /
short
circuit to earth
65535
Control unit faulty
-Boost pressure too
high
-Boost pressure too
low
-Hard misfire at full
-Test N75
load because of
"Boost pressure to
max. exceeded,
implausible signal"
fault