Mitsubishi Colt Ralliart. Manual - part 235

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-32

DIAGNOSTIC PROCEDURE

STEP 1. Connector check: C-17 rear left wheel 
speed sensor connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. Remove the rear left wheel speed sensor 
and check it.
Refer to 

P.35B-81

.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the rear left wheel speed sensor 
(Refer to 

P.35B-80

).

STEP 3. Check the wheel bearing for excessive 
play.
Refer to GROUP 27, On-vehicle Service 

− Wheel 

Bearing Axial Play Check 

P.27-3

.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace the hub assembly (Refer to 
GROUP 27, Rear Axle Hub 

P.27-6

 ).

STEP 4. Check the encoder for detecting wheel 
speed.
Check the encoder for presence of foreign objects or 
deformation.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

If foreign objects are found, clean the 
encoder. If deformation is found, replace the 
hub (Refer to GROUP 27, Rear Axle Hub 

P.27-6

 ).

STEP 5. Check whether the diagnosis code is 
reset.

CAUTION

Before connecting or disconnecting the 
M.U.T.-III, turn the ignition switch to the "LOCK" 
(OFF) position.
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.

(7) Disconnect M.U.T.-III.

Q: Is code No.C1216 set?

YES : 

Replace the hydraulic unit (integrated with 

ABS-ECU) (Refer to 

P.35B-78

).

NO : 

The malfunction is intermittent. Refer to 
GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction 

P.00-13

.

AC313878

Connector: C-17

AC

Harness side

C-17(B)

AC206895

AC

Diagnosis

connector

MB991827

MB991824 

MB991910

Main

Index

Group

TOC

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-33

Code No.C1266: Motor system (stuck)

OPERATION

• The ABS-ECU contains the power supply circuit 

(terminal No.25) for the motor pump. The motor 
pump is energised by the pump relay, which is 
incorporated in the ABS-ECU.

• The pump relay, which is incorporated in the 

ABS-ECU, is always energising the motor pump 
unless the initial check is in progress when the 
ignition switch is turned on, or the recurrent sys-
tem check is in progress.

DIAGNOSIS CODE SET CONDITIONS

These diagnosis codes will be set under the cases 
below.

• The ABS-ECU monitors the voltage, which is cre-

ated by the pump motor coasting, after the motor 
relay is turned off. If the voltage continues only for 
too short period, the ECU determines that the 
pump motor is not running smoothly (i.e. motor 
seizure), and sets this diagnosis code.

PROBABLE CAUSES

The most likely causes for these diagnosis codes to 
set are:

• Damaged wiring harness or connector

• Malfunction of the hydraulic unit (integrated with 

ABS-ECU)

IGNITION
SWITCH (IG1)

ELECTRIC
POWER
STEERING
SYSTEM

ABS-ECU

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

Power Supply Circuit

Main

Index

Group

TOC

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-34

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

CAUTION

Before connecting or disconnecting the 
M.U.T.-III, turn the ignition switch to the "LOCK" 
(OFF) position.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the diagnosis code is set.
(3) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Is code No.C1273 set?

YES : . 

Carry out the troubleshooting for diagnosis 

code C1273 (Refer to 

P.35B-38

).

NO : . 

Go to Step 2.

STEP 2. Check ABS-ECU connector A-05 for 
loose, corroded or damaged terminals, or 
terminals pushed back in the connector.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair or replace the damaged 
component(s). Refer to GROUP 00, How to 
Use Troubleshooting/Inspection Service 
Points 

− Connector Inspection Service 

Points 

P.00-11

. 

AC206895

AC

Diagnosis

connector

MB991827

MB991824 

MB991910

AC313863AB

Connector: A-05

Harness side

A-05(B)

Main

Index

Group

TOC

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-35

STEP 3. Check the harness wire between the 
ABS-ECU connector A-05 terminal 20 and 
ignition switch (IG1).

NOTE: 

After inspecting connector B-129 and B-110, inspect 
the wire. If connector B-129 or B-110 is damaged, 
repair or replace it. 

Q: Is the harness wire between the ABS-ECU 

connector A-05 terminal 20 and ignition switch 
(IG1) damaged?
YES : 

Repair the harness wire and then go to Step 

6.

NO : 

Go to Step 4.

AC313863AB

Connector: A-05

Harness side

A-05(B)

AC313870AI

Connector: B-110

Junction Block (Front view)

Junction block side

12

5

9

8

1 2

1011

3 4

14

13

6 7

AC313872AJ

Connector: B-129

Junction Block (Rear view)

Junction block side

Main

Index

Group

TOC