Mitsubishi Outlander GS45X. Manual - part 406

 

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Mitsubishi Outlander GS45X. Manual - part 406

 

 

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-51

STEP 5. Wiring harness check between A-02 ASC-ECU 
connector terminal No.34 and A-59 front wheel speed 
sensor <RH> connector terminal No.1 and between A-02 
ASC-ECU connector terminal No.33 and A-59 front wheel 
speed sensor <RH> connector terminal No.2.
Q: Is the check result normal?

YES : Go to Step 6.
NO :  Repair the wiring harness. Then go to Step 12.

STEP 6. Check for wheel speed sensor <FR> installation
Check how the wheel speed sensor <FR> is installed (Discon-
nection of wheel speed sensor <FR>, loose mounting bolt, 
etc.).
Q: Is the check result normal?

YES : Go to Step 7.
NO :  Reinstall the wheel speed sensor <FR> correctly 

(Refer to 

P.35C-288

). Then go to Step 7.

STEP 7. Check for wheel speed sensor <FR> output 
current
Refer to 

P.35C-277

.

Q: Is the check result normal?

YES : Go to Step 8.
NO :  Replace the wheel speed sensor <FR> (Refer to 

P.35C-288

). Then go to Step 11.

STEP 8. Check for wheel bearing looseness
NOTE: 

.

Loose wheel bearing may increase the gap between the 
wheel speed sensor <FR> and the wheel speed detection 
magnet encoder.

Check the wheel bearing <FR> for looseness (Refer to 
GROUP 26 

 Wheel Bearing Play Check 

P.26-11

).

Q: Is the check result normal?

YES : Go to Step 9.
NO :  Replace the wheel bearing <FR> (Refer to GROUP 

26 

− Front axle hub assembly 

P.26-18

). Then go to 

Step 12.

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-52

STEP 9. Check of wheel speed detection encoder
Check the encoder for adhesion of foreign materials or defor-
mation.
Q: Is the check result normal?

YES : Go to Step 10.
NO (Adhesion of foreign materials) : Remove the foreign 

materials and clean the encoder so as not to disturb 
the magnetization pattern on it while taking care of the 
magnet, magnetic substance, and magnetic 
attraction. Then go to Step 12.

NO (Deformation) : Replace the wheel bearing <FR> 

(Refer to GROUP 26 

− Front axle hub assembly 

P.26-18

). Then go to Step 12.

STEP 10. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or higher.

NOTE: The ABS warning light does not turn OFF in some 
cases unless the vehicle runs at 12mph (20 km/h) or higher.

Q: Is DTC C101C set?

YES : Replace the wheel speed sensor <FR> (Refer to 

P.35C-288

). Then go to Step 11.

NO :  Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/How to Cope with Intermittent 
Malfunctions 

P.00-15

).

STEP 11. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12 mph (20 km/h) or higher.

NOTE: The ABS warning light does not turn OFF in some 
cases unless the vehicle runs at 12 mph (20 km/h) or 
higher.

Q: Is DTC C101C set?

YES : Replace the hydraulic unit (integrated with ASC-ECU) 

(Refer to 

P.35C-287

). Then go to Step 12.

NO :  The procedure is complete.

STEP 12. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12 mph (20 km/h) or higher.

NOTE: The ABS warning light does not turn OFF in some 
cases unless the vehicle runs at 12 mph (20 km/h) or 
higher.

Q: Is DTC C101C set?

YES : Return to Step 1.
NO :  The procedure is complete.

AC504925

Oil seal

Magnetic
encoder

AC

Wheel
bearing

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-53

DTC C1027: Abnormality in RL wheel speed sensor signal

Wheel Speed Sensor Circuit

ASC-ECU

FRONT 
WHEEL 
SPEED 
SENSOR 
(LH)

FRONT 
WHEEL 
SPEED 
SENSOR 
(RH)

REAR 
WHEEL 
SPEED 
SENSOR 
(LH)

REAR 
WHEEL 
SPEED 
SENSOR 
(RH)

AC901112

Connector: A-02

A-02 (B)

AF

AC901075BC

Connector: C-129

AC709496

AM

Connector: D-114

D-114 (B)

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-54

CAUTION

• If there is any problem in the CAN bus lines, an incor-

rect diagnostic trouble code may be set. Prior to this 
diagnosis, diagnose the CAN bus lines (Refer to 
GROUP 54C 

 CAN Bus Line Diagnostic Flow 

P.54C-10

).

• Whenever ECU is replaced, ensure that the CAN bus 

lines are normal.

• When the hydraulic unit (integrated with ASC-ECU) is 

replaced, always carry out the calibration of the steer-
ing wheel sensor, the G and yaw rate sensor and brake 
fluid pressure sensor (Refer to 

P.35C-283

P.35C-282

 

and 

P.35C-284

).

.

OPERATION

• The wheel speed sensor is a kind of a pulse generator. It 

consists of encoders (a plate on which north and south pole 
sides of the magnets are arranged alternately) for detecting 
the wheel speed which rotates at the same speed of the 
wheels and wheel speed sensors. This sensor outputs fre-
quency pulse signals in proportion to the wheel speed.

• The pulse signals, which the wheel speed sensor creates, 

are sent to ASC-ECU. ASC-ECU uses the frequency of the 
pulse signals to determine the wheel speed.

.

DTC SET CONDITIONS

ASC-ECU monitors the signals from each wheel speed sensor 
while the vehicle is being driven. If any fault below is found in 
these sensor signals, ASC-ECU will set the relevant diagnostic 
trouble code.

• Irregular change in the wheel speed sensor signal

• Wheel speed sensor signal continuously indicates high 

value.

.

PROBABLE CAUSES

Current trouble

• Excessive gap between the wheel speed sensor and the 

wheel speed detection encoder

• Adhesion of foreign materials on the wheel speed sensor

• Adhesion of foreign materials on the wheel speed detection 

encoder

• Wheel bearing malfunction

• Malfunction of wheel speed sensor

• Damaged wiring harness and connectors

• External noise interference

• Improper installation of the wheel speed sensor

• Deformation of the wheel speed detection encoder

• ASC-ECU malfunction

• Disturbance of magnetization pattern for wheel speed 

detection encoder

• The number of poles on the Magnetic encoder for wheel 

speed detection (N-pole and S-pole) is changed

 

 

 

 

 

 

 

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