Mitsubishi Outlander GS45X. Manual - part 405

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-47

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 <FL>

(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 C1011 set?

YES : Replace the wheel speed sensor <FL> (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 C1011 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 C1011 set?

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

AC504925

Oil seal

Magnetic
encoder

Wheel
bearing

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-48

DTC C101C Abnormality in FR 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

Connectors: A-02, A-59

A-02 (B)

A-59 (B)

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-49

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

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-50

Past trouble

• When the diagnostic trouble code No. C1015 is also set,

carry out diagnosis with particular emphasis on wiring har-
ness and connector failures between ASC-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 diagnostic trouble code No. C1015 is not set, the fol-

lowing 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

• MB991997: ASC check harness

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 DTC C1015 is also set.
Q: Is DTC C1015 also set?

YES : Perform the diagnosis for DTC C1015 (Refer to

P.35C-26

NO : Go to Step 4.

STEP 4. Connector check: A-02 ASC-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.

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