Mitsubishi Outlander GS45X. Manual - part 362

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-69

PROBABLE CAUSES

Current trouble

• Excessive gap between the wheel speed sensor and the 

magnetic encoder for wheel speed detection

• Adhesion of foreign materials on the wheel speed sensor

• Wheel bearing malfunction

• Deformation of the magnetic encoder for wheel speed 

detection

• Adhesion of foreign materials on the magnetic encoder for 

wheel speed detection

• Malfunction of wheel speed sensor

• Improper installation of the wheel speed sensor

• ABS-ECU malfunction

• Disturbance of magnetization pattern for magnetic encoder 

for wheel speed detection

• The number of poles on the magnetic encoder for wheel 

speed detection (the number of N-pole and S-pole) is 
changed.

Past trouble

• When the DTC C102B is also set, carry out diagnosis with 

particular emphasis on wiring harness and connector fail-
ures between ABS-ECU and the wheel speed sensor. For 
diagnosis procedures, refer to How to treat past trouble 
(Refer to GROUP 00 

− How to Use Troubleshooting/How to 

Treat Past Trouble 

P.00-17

).

• When the DTC C102B is not set, the following conditions 

may be present:

• Some wheels slip.

• Unstable vehicle attitude

• External noise interference

• Vehicle ran with the parking brake applied.

• Rotate only two wheels with drum tester

DIAGNOSIS

Required Special Tools:

• MB991958 Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827 M.U.T.-III USB Cable

• MB991910 M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
lines.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?

YES : Go to Step 3.
NO :  Repair the CAN bus lines (Refer to GROUP 54C 

− 

CAN Bus Diagnostics Table 

P.54C-17

). On 

completion, go to Step 2.

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-70

STEP 2. DTC recheck after resetting CAN bus lines
Q: Is DTC C1035 set?

YES : Go to Step 3.
NO :  The procedure is complete.

STEP 3. Using scan tool MB991958, check the DTC
Check that the DTC C102B is also set.
Q: Is DTC C102B also set?

YES : Perform the diagnosis for the DTC C102B (Refer to 

P.35B-33

).

NO :  Go to Step 4.

STEP 4. Check wheel speed sensor <RR> installation
Check how the wheel speed sensor <RR> is installed (Discon-
nection of wheel speed sensor <RR>, loose mounting bolt, 
etc.).
Q: Is the check result normal?

YES : Go to Step 5.
NO :  Reinstall the wheel speed sensor <RR> correctly 

(Refer to 

P.35B-189

). Then go to Step 5.

STEP 5. Check for wheel speed sensor <RR> output 
current
Refer to 

P.35B-184

.

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Replace the wheel speed sensor <RR> (Refer to 

P.35B-189

). Then go to Step 9.

STEP 6. Check for wheel bearing looseness
NOTE: 

.

•

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

•

Check the wheel bearing <RR> for looseness (Refer to 
GROUP 27A 

−

 On-vehicle Service 

P.27A-6

).

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Replace the rear wheel hub assembly <RR> (Refer to 

GROUP 27A 

− Rear Axle Hub Assembly 

P.27A-8

). 

Then go to Step 10.

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-71

STEP 7. Check 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 8.
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 10.

NO (Deformation) : Replace the rear wheel hub assembly 

<RR> (Refer to GROUP 27A 

− Rear Axle Hub 

Assembly 

P.27A-8

). Then go to Step 10.

STEP 8. 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 C1035 set?

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

P.35B-189

). Then go to Step 9.

NO :  Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/How to Cope with Intermittent 
Malfunctions 

P.00-15

).

STEP 9. 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 C1035 set?

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

(Refer to 

P.35B-188

). Then go to Step 10.

NO :  The procedure is complete.

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 C1035 set?

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

AC608763

Ball bearing

Rear hub
assembly

Magnetic
encoder

AB

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-72

DTC C1041: Abnormality in periodical signal for FL wheel speed sensor

CAUTION

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

rect DTC 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.

.

CIRCUIT 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 ABS-ECU. ABS-ECU uses the frequency of the 
pulse signals to determine the wheel speed.

.

DTC SET CONDITIONS

ABS-ECU monitors the signals from each wheel speed sensor 
while the vehicle is being driven. If any periodical drop is found 
in these sensor signals, ABS-ECU will set the relevant DTC.

.

PROBABLE CAUSES

Current trouble

• Excessive gap between the wheel speed sensor and the 

magnetic encoder for wheel speed detection

• Wheel bearing malfunction

• Deformation of the magnetic encoder for wheel speed 

detection

• Adhesion of foreign materials on the wheel speed sensor

• Adhesion of foreign materials on the magnetic encoder for 

wheel speed detection

• Malfunction of wheel speed sensor

• Improper installation of the wheel speed sensor

• ABS-ECU malfunction

• Disturbance of magnetization pattern for magnetic encoder 

for wheel speed detection

• The number of poles on the magnetic encoder for wheel 

speed detection (the number of N-pole and S-pole) is 
changed.