Mitsubishi Grandis. Manual - part 912

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-63

<RH drive vehicles>

TECHNICAL DESCRIPTION (COMMENT)

If the MUT-III can not communicate with the ABS 
system, the CAN bus lines may be defective. If the 
ABS system does not work, the ABS-ECU or its 
power supply circuit may be defective. 

PROBABLE CAUSES

• Damaged wiring harness or connector

• Malfunction of the hydraulic unit (Integrated with 

ABS-ECU)

IGNITION 
SWITCH (IG1)

DIAGNOSIS 
CONNECTOR

POWER
SUPPLY

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet

FRONT SIDE

AC313153

ABS-ECU

20

13

26

21

23

Data Link Connector Circuit

AB

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-64

DIAGNOSIS

STEP 1. MUT-III CAN bus diagnostics

CAUTION

Before connecting or disconnecting the MUT-III, 
turn the ignition switch to the "LOCK" (OFF) 
position.
Use MUT-III to diagnose the CAN bus lines.
(1) Connect MUT-III to the 16-pin diagnosis 

connector.

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.

Q: Is the check result normal?

YES : 

Check and repair the power supply circuit 

system (Refer to 

P.35B-65

).   

NO : 

Repair the CAN bus lines (Refer to GROUP 
54D, CAN bus line Diagnostic flow 

P.54D-9

). 

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-65

INSPECTION PROCEDURE 2: ABS-ECU power supply supply system

<LH drive vehicles>

IGNITION
SWITCH (IG1)

ABS-ECU

POWER
SOURCE

Wire colour code
B : Black     LG : Light green
G : Green     L : Blue
W : White     Y : Yellow
SB : Sky blue     BR : Brown
O : Orange     GR : Gray
R : Red     P : Pink     V : Violet

ABS-ECU Power Supply and Ground Circuit

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-66

<RH drive vehicles>

OPERATION

• The ABS-ECU is energized by the ignition switch 

(IG1) through multi-purpose fuse 2 and the 
ABS-ECU terminal 20.

• If the power supply to the ABS-ECU has failed, 

MUT-III will not be able to communicate with it.

PROBABLE CAUSES

• Damaged wiring harness or connector

• Defective battery

• Charging system failed

• Malfunction of the hydraulic unit (integrated with 

ABS-ECU)

IGNITION
SWITCH (IG1)

ABS-ECU

POWER
SOURCE

Wire colour code
B : Black     LG : Light green
G : Green     L : Blue
W : White     Y : Yellow
SB : Sky blue     BR : Brown
O : Orange     GR : Gray
R : Red     P : Pink     V : Violet

ABS-ECU Power Supply and Ground Circuit