Mitsubishi Colt Ralliart. Manual — part 639

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-101

STEP 6. Check for wheel speed sensor as a
single unit
Refer to GROUP 35B

− Wheel speed sensor

P.35B-81

.

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Replace the wheel speed sensor.

STEP 7. Wheel speed detection magnetic
encoder check

Check the wheel speed detection magnetic encoder
for adhesion of foreign materials or deformation.
NOTE: For the rear wheel speed detection magnetic
encoder, check from the mounting hole of the wheel
speed sensor by rotating the rear hub.

Q: Is the check result normal?

YES : .

Go to Step 8.

NO <Front> : .

If foreign objects are found, clean

the magnetic encoder for wheel speed
detection. When the encoder is deformed,
replace the wheel bearing. (Refer to
GROUP 26

− Front Axle Hub Assembly

P.26-13

.)

NO <Rear> : .

If foreign objects are found, clean

the magnetic encoder for wheel speed
detection. When the encoder is deformed,
replace the rear hub assembly. (Refer to
GROUP 27

− Rear Axle Hub Assembly

P.27-6

.)

STEP 8. Check the wheel bearing.
NOTE: Loose wheel bearing may increase the gap
between the wheel speed sensor and the wheel
speed detection magnet encoder. Check each wheel
bearing for looseness.
Front: Refer to GROUP 26

− On-vehicle Service

P.26-5

.

Rear: Refer to GROUP 27

− On-vehicle Service

P.27-3

.

Q: Is the check result normal?

YES :

Go to Step 9.

NO <Front> :

Replace the wheel bearing. (Refer to

GROUP 26

− Front Axle Hub Assembly

P.26-13

.)

NO <Rear> :

Replace the rear hub assembly.

(Refer to GROUP 27

− Rear Axle Hub

Assembly

P.27-6

.)

STEP 9. Retest the system.

Q: Does the stability control system operate too

frequently?
YES :

Replace the ASC-ECU.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Cope with Intermittent

Malfunction

P.00-13

.)

AC600965

<Front>

<Rear>

Encoder

AB

Encoder

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-102

Inspection Procedure 10: Steering wheel sensor power supply system

OPERATION

The steering wheel sensor is energised by the igni-
tion switch (IG1) through the multi-purpose fuse No.
40 and the steering wheel sensor terminal No. 2.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• Steering wheel sensor malfunction

Steering Wheel Sensor Power Source Circuit

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

IGNITION
SWITCH (IG1)

STEERING
WHEEL
SENSOR

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-103

DIAGNOSTIC PROCEDURE

STEP 1. Connector inspection: B-22 joint
connector, B-131 junction block connector, B-142
steering wheel sensor connector

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the damaged connector.

STEP 2. Measure the resistance between B-142
steering wheel sensor connector and B-131
junction block connector.

(1) Disconnect B-142 steering wheel sensor

connector and B-131 junction block connector.

(2) Measure the resistance between B-142 steering

wheel sensor connector terminal No. 2 and B-131
junction block connector terminal No. 30.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Go to Step 3.

AC601112

Connector: B-22

AB

B-22

Harness side

J/B

i

û

j

AC601113

J/B

(Back view)

AC601113

Connector: B-131

AB

B-131

Harness side

AC601114

Connector: B-142

AB

B-142

Harness side

J/B

i

û

j

AC601113

J/B

(Back view)

AC601113

Connector: B-131

AB

B-131

Harness side

AC601114

Connector: B-142

AB

B-142

Harness side

AC601116

B-131: Harness side

B-142: Harness side

AB

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-104

STEP 3. Check the wiring harness between B-142
steering wheel sensor connector terminal No. 2
and the ignition switch (IG1).

Check the power supply line for open circuit.

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

− How to Cope with Intermittent

Malfunction

P.00-13

.)

NO :

Repair the wiring harness between B-142
steering wheel sensor connector terminal
No. 2 and the ignition switch (IG1).

STEP 4. Measure the resistance at B-142 steering
wheel sensor connector.

(1) Disconnect B-142 steering wheel sensor

connector, and measure at the wiring
harness-side connector.

(2) Measure the resistance between B-142 steering

wheel sensor connector terminal No. 1 and the
body earth.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair the wiring harness between B-142
steering wheel sensor connector terminal
No. 1 and the body earth.

STEP 5. Retest the system.
Check that the steering wheel sensor communicates
with the ASC-ECU normally.
NOTE: When the steering wheel sensor related diag-
nosis code is not set to ACS-ECU and the steering
wheel sensor is normal at the M.U.T.-III CAN bus
diagnosis, the communication with the steering
wheel sensor is normal.

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

− How to Cope with Intermittent

Malfunction

P.00-13

.)

NO :

Replace the steering wheel sensor.

AC601114

Connectors: B-141, B-142

AC

B-141

B-141: Harness side

B-142

B-142: Harness side

AC601114

Connector: B-142

AB

B-142

Harness side

AC601118AB

B-142: Harness side

Main

Index

Group

TOC