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