DIA GNOSTIC DISPLA
Y S
DIA GNOSTIC CODES
ST A TIC INDICA TION
Full TT
CONFIGURA TIONS
Semi & Centr e axle TT
BLANK DISPLAY
SENSOR BAR
00
01
02
03
04
05
06
07
08
09
OC
OA
OE
11
12
13
14
15
16
20
21
22
23
24
25
26
40
41
42
43
61
62
63
67
68
69
71
72
73
77
78
79
80
81
82
83
87
88
89
90
91
92
93
99
CA
CF
d b
No supply on ignition switched line.
Possible causes:
Fuse blown. DDU or cable fault.
Open circuit B -
Bar displayed = Sensor output O.K.
Bar not displayed = Sensor output too low
System is O.K. vehicle is moving
1A Sensor/wiring open or short circuit
1B Sensor/wiring open or short circuit
2A Sensor/wiring open or short circuit
2B Sensor/wiring open or short circuit
3A Sensor/wiring open or short circuit
3B Sensor/wiring open or short circuit
System is O.K. vehicle is stationary
Retarder / Wiring open circuit
Retarder / Wiring short circuit
Reset to ride / Wiring short circuit
Reset to ride / Wiring open circuit
Warning lamp circuit fault
LOW SENSOR OUTPUT GROUP
1A Sensor system fault
1B Sensor system fault
2A Sensor system fault
2B Sensor system fault
3A Sensor system fault
3B Sensor system fault
Possible causes:
Sensor worn, maladjusted sensor, wiring open or short circuit.
Incorrect exciter type.
Possible causes: Exciter tooth count.
INTERMITTENT LOW SENSOR OUTPUT GROUP
1A Sensor system fault
1B Sensor system fault
2A Sensor system fault
2B Sensor system fault
3A Sensor system fault
3B Sensor system fault
Possible causes:
Loose sensor, connection, bracket or exciter.
Dented exciter.Maladjusted sensor or worn sensor cable insulation.
ONE WHEEL WITH SLOW RECOVERY GROUP
Sensor wiring crossed across an axle
Slow recovery of one wheel of red channel
Slow recovery of one wheel of blue channel
Slow recovery of one wheel of yellow channel
Possible causes:
Slow brake release, foundation brake mechanical faults, dry bearings, broken spring, restricted piping.
Modulator fault Check for kinks and blockages etc.
Incorrect piping, Wiring.
OPEN CIRCUIT MODULATOR SOLENOID OR SOLENOID
WIRING GROUP
Hold solenoid circuit fault, red channel
Hold solenoid circuit fault, blue channel
Hold solenoid circuit fault, yellow channel
Dump solenoid circuit fault, red channel
Dump solenoid circuit fault, blue channel
Dump solenoid circuit fault, yellow channel
SHORT CIRCUIT ACROSS MODULATOR SOLENOID
OR SOLENOID WIRING GROUP
Hold solenoid circuit fault, red channel
Hold solenoid circuit fault, blue channel
Hold solenoid circuit fault, yellow channel
Dump solenoid circuit fault, red channel
Dump solenoid circuit fault, blue channel
Dump solenoid circuit fault, yellow channel
MODULATOR SOLENOID WIRING OR SOLENOID
SHORT TO B+ GROUP
Poor insulation in the modulator solenoid or wiring fault.
Hold solenoid circuit fault, red channel.
Hold solenoid circuit fault, blue channel.
Hold solenoid circuit fault, yellow channel.
Dump solenoid circuit fault, red channel.
Dump solenoid circuit fault, blue channel.
Dump solenoid circuit fault, yellow channel.
SUPPLY VOLTAGE GROUP
Supply voltage at ECU less than 18v when a solenoid is energised.
Faulty supply from ISO 7638 Pin 1 or fuse blown.
Supply voltage at the ECU greater than 32v.
Internal ECU fault.
Internal ECU fault.
VARIOUS CODES
Erase stored fault.
Sensors and Solenoid not connected.
Alternating with code 90 (incomplete solenoid function).
Indicates that electrical contact has been made when using the ECU diagnostic connectors to switch through fault codes.
CO
C1
C2
C3
C4
C5
C6
C7
C8
C9
CONFIGURATION CODES
Figures in brackets indicate sensing is disabled when the axle is lifted.
Function Axle Lifted Sensors Used Modulators Used
2S/1M 1A, 1B RD
2S/2M
4S/2M
2A, 2B BU YE
3A, 2A, 2B, 3B BU YE
4S/2M 3 (3A), 2A, 2B, (3B) BU YE
4S/3M 2A, 1A, 1B, 2B BU RD YE
4S/3M 1 2A, 1A, 1B, 2B BU (RD) YE
6S/3M 3A, 2A, 1A, 1B, 2B, 3B BU RD YE
6S/3M 1 3A, 2A, (1A), (1B), 2B, 3B BU (RD) YE
6S/3M 3 (3A), 2A, 1A, 1B, 2B, (3B) BU RD YE
6S/3M 1, 3 3A, 2A, (1A), (1B), 2B, 3B BU (RD) YE
Details viewed from above
Sensed axle which may be a lift axle
NOTE: Any non sensed axle may be lifted.
Red modulator
Blue modulator
Yellow modulator
Other configurations are possible
NOTE: If a code is displayed and after following recommended procedure,
as detailed in the Service Manual, no fault is found, the ECU should be replaced.
NOTE: Check memory codes of the ECU are clear
Tel: INT + 43 7865 16 40
Fax: INT + 43 4865 16 4027
Tel: INT + 32 2725 3707
Fax: INT + 32 2725 4099
Tel: INT + 333 88 68 22 00
Fax: INT + 333 88 68 22 09
Tel: INT + 49 711 934 91 70
Fax: INT + 49 711 934 91 740
Tel: INT + 44 1 325 310 110
Fax: INT + 44 1 325 311 834
Tel: INT + 48 34 350 1100
Fax: INT + 48 34 350 1111
Tel: INT + 34 9 3573 1030
Fax: INT + 34 9 3573 0728
Tel: INT + 46 418 47 6000
Fax: INT + 46 418 47 6001
000 700 237 / 06.00 / Redditch