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