Mitsubishi Outlander GS45X. Manual - part 420

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-107

STEP 7. Check for wheel speed sensor <RL> installation
Check how the wheel speed sensor <RL> is installed (Discon-
nection of wheel speed sensor <RL>, loose mounting bolt, 
etc.).
Q: Is the check result normal?

YES : Go to Step 8.
NO :  Reinstall the wheel speed sensor <RL> correctly 

(Refer to 

P.35C-288

). Then go to Step 8.

STEP 8. Check for wheel speed sensor <RL> output 
current
Refer to 

P.35C-277

.

Q: Is the check result normal?

YES : Go to Step 9.
NO :  Replace the wheel speed sensor <RL> (Refer to 

P.35C-288

). Then go to Step 12.

STEP 9. Check for wheel bearing looseness
NOTE: 

.

•

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

•

Check the Rear wheel hub assembly <RL (FWD)> (Refer to 
GROUP 27A 

−

 Wheel Bearing Play Check 

P.27A-6

).

•

Check the wheel bearing <RL (AWD)> for looseness (Refer 
to GROUP 27B 

−

 Wheel Bearing Play Check 

P.27B-17

).

Q: Is the check result normal?

YES : Go to Step 10.
NO (FWD) : Replace the rear wheel hub assembly <RL> 

(Refer to GROUP 27A 

− Rear axle hub assembly 

P.27A-8

). Then go to Step 13.

NO (AWD) : Replace the wheel bearing <RL> (Refer to 

GROUP 27B 

− Rear axle hub assembly 

P.27B-19

). 

Then go to Step 13.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-108

STEP 10. 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 11.
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 13.

NO <Deformation (FWD)> : Replace the rear wheel hub 

assembly <RL> (Refer to GROUP 27A 

− Rear axle 

hub assembly 

P.27A-8

). Then go to Step 13.

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

<RL> (Refer to GROUP 27B 

− Rear axle hub 

assembly 

P.27B-19

). Then go to Step 13.

STEP 11. 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 C1048 set?

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

P.35C-288

). Then go to Step 12.

NO :  Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/How to Cope with Intermittent 
Malfunctions 

P.00-15

).

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 C1048 set?

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

(Refer to 

P.35C-287

). Then go to Step 13.

NO :  The procedure is complete.

AC704785

Rear hub

Oil seal

Ball bearing

Magnetic
encoder

AB

Magnetic
encoder

Rear hub
assembly

Rear wheel bearing

<FWD>

<AWD>

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-109

STEP 13. 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 C1048 set?

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

DTC C1049: RR wheel speed sensor control phase time exceeded

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

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-110

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

This diagnostic trouble code is set if any malfunction below is 
found:

• When the brake fluid pressure is decreased for a long time.

• When the brake fluid pressure is held for a long time.

.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• External noise interference

• Malfunction of wheel speed sensor

• ASC-ECU malfunction

• 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

AC901080AN

Connector: D-133

D-133 (B)