Mitsubishi Outlander GS45X. Manual — part 367

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-89

STEP 9. Check for wheel bearing looseness
NOTE:

.

•

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

•

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

−

Wheel Bearing Play Check

P.26-11

).

Q: Is the check result normal?

YES : Go to Step 10.
NO : Replace the wheel bearing <FL> (Refer to GROUP 26

− Front Axle Hub Assembly

P.26-13

). Then go to Step

13.

STEP 10. 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 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) : Replace the wheel bearing <FL>

(Refer to GROUP 26

− Front Axle Hub Assembly

P.26-13

). 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 C1046 set?

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

P.35B-189

). 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 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 C1046 set?

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

(Refer to

P.35B-188

). Then go to Step 13.

NO : The procedure is complete.

AC608761

Oil seal

Magnetic
encoder

Wheel
bearing

AB

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-90

STEP 13. 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 C1046 set?

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

DTC C1047: FR wheel speed sensor control phase time exceeded

AC703729

Wheel Speed Sensor Circuit

ABS-ECU

(LH)

(LH)

(RH)

(RH)

REAR WHEEL SPEED SENSOR

AB

FRONT WHEEL SEED SENSOR

AC901112

Connectors: A-01, A-59

A-01 (B)

AL

A-59 (B)

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-91

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

).

.

CIRCUIT OPERATION

• The wheel speed sensor is a type of pulse generator. It con-

sists 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

This DTC 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

• ABS-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

• Wheel bearing malfunction

• Improper installation of the wheel speed sensor

• Deformation of the wheel speed detection encoder

• Disturbance of magnetization pattern for wheel speed

detection encoder

• Missing teeth of the wheel speed detection encoder

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

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-92

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 C1047 set?

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

STEP 3. Using scan tool MB991958, check the DTC
Check that the DTCs C1015, C101C, C101F, or C1042 are also
set.
Q: Are DTC C1015, C101C, C101F, or C1042 also set?

YES : Carry out the diagnosis for the relevant DTCs.
NO : Go to Step 4.

STEP 4. Using scan tool MB991958, check the data list
Check the following data list (Refer to

P.35B-179

).

• Item No.02: FR wheel speed sensor

Q: Is the check result normal?

YES : Go to Step 11.
NO : Go to Step 5.

STEP 5. 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 6.
NO : Repair the defective connector. Then go to Step 13.

STEP 6. 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 7.
NO : Repair the wiring harness. Then go to Step 13.