Mitsubishi Outlander GS45X. Manual — part 356

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-45

• Disturbance of magnetization pattern for wheel speed

detection encoder

• 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 C1015 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 DTC C1015 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.

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.

STEP 2. DTC recheck after resetting CAN bus lines
Q: Is DTC C101C set?

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

STEP 3. Using scan tool MB991958, check the DTC
Check that the DTC C1015 is also set.
Q: Is DTC C1015 also set?

YES : Perform the diagnosis for the DTC C1015 (Refer to

P.35B-22

).

NO : Go to Step 4.

ABS DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-46

STEP 4. Connector check: A-01 ABS-ECU connector, A-59
front wheel speed sensor <RH> connector
Q: Is the check result normal?

YES : Go to Step 5.
NO : Repair the defective connector. Then go to Step 12.

STEP 5. Wiring harness check between A-01 ABS-ECU
connector terminal No.22 and A-59 front wheel speed
sensor <RH> connector terminal No.1, and between A-01
ABS-ECU connector terminal No.21 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 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.35B-189

). Then go to Step 7.

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

P.35B-184

.

Q: Is the check result normal?

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

P.35B-189

). 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.26-13

). Then go to

Step 12.

ABS DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-47

STEP 9. 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 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.26-13

). 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.35B-189

). 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 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 hydraulic unit (integrated with ABS-ECU)

(Refer to

P.35B-188

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

AC608761

Oil seal

Magnetic
encoder

Wheel
bearing

AB

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-48

DTC C1027: Abnormality in RL wheel speed sensor signal

CAUTION

If there is any problem in the CAN bus lines, an incorrect
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

).

.

AC703729

Wheel Speed Sensor Circuit

ABS-ECU

(LH)

(LH)

(RH)

(RH)

REAR WHEEL SPEED SENSOR

AB

FRONT WHEEL SEED SENSOR

AC901112

Connector: A-01

A-01 (B)

AE

AC901075BC

Connector: C-129

AC709496

AO

Connector: D-114