Mitsubishi Grandis. Manual - part 909

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-51

STEP 7. Check whether the diagnosis code is 
reset.

Check again if the diagnosis code is set.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF) 

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Is code No.C1276 set?

YES : 

Replace the hydraulic unit (integrated with 

ABS-ECU). Then go to Step 8.

NO : 

It can be assumed that this malfunction is 
intermittent. Refer to GROUP 00, How to 
Use Troubleshooting/Inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction 

P.00-5

.

STEP 8. Check whether the diagnosis code is 
reset.

Check again if the diagnosis code is set.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF) 

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Is code No.C1276 set?

YES : 

Go to Step 1.

NO : 

The procedure is complete.

Code No.C1607: Trouble in ABS-ECU

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-52

CAUTION

If there is any problem in the CAN bus lines, an 
incorrect diagnosis code may be set. Prior to this 
diagnosis, diagnose the CAN bus lines.

CAUTION

Whenever the ECU is replaced, ensure that the 
CAN bus lines are normal.

DIAGNOSIS CODE SET CONDITIONS

The ABS-ECU always monitors itself while the 
system is working. If the ECU detects any faults, it 
will set this diagnosis code.

PROBABLE CAUSES

• Malfunction of the hydraulic unit (integrated with 

ABS-ECU)

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.
(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.
(4) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

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

P.54D-9

). Then go to Step 2.

STEP 2. MUT-III diagnosis code

CAUTION

Before connecting or disconnecting the MUT-III, 
turn the ignition switch to the "LOCK" (OFF) 
position.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF) 

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Is code No.C1607 set?

YES : 

Replace the hydraulic unit (integrated with 

ABS-ECU).

NO : 

The procedure is complete.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-53

Code No.C1860: Power supply high voltage
Code No.C1861: Power supply low voltage

<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-54

<RH drive vehicles>

CAUTION

If there is any problem in the CAN bus lines, an 
incorrect diagnosis code may be set. Prior to this 
diagnosis, diagnose the CAN bus lines.

OPERATION

The ABS-ECU is energized by the ignition switch 
(IG1) through multi-purpose fuse 2 and the 
ABS-ECU terminal 20.

DIAGNOSIS CODE SET CONDITIONS

C1860 will be set when the power supply voltage to 
the ABS-ECU has decreased to a predetermined 
value or lower. C1861 will be set when the power 
supply voltage to the ABS-ECU has increased to a 
predetermined value or higher.

PROBABLE CAUSES

• Excessive electrical load

• Defective battery

• Damaged wiring harness or connector

• Malfunction of the hydraulic unit (integrated with 

ABS-ECU)

• Charging system failed

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