Mitsubishi Outlander XL. Manual — part 658

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

Past trouble

｠

When the diagnostic trouble code No. C1015 is also set, carry
out diagnosis with particular emphasis on wiring harness and
connector failures between ASC-ECU and the wheel speed
sensor. For diagnosis procedures, refer to How to treat past
trouble (GROUP 00 - How to Cope with Intermittent
Malfunction P.00-15).

｠

When diagnostic trouble code No. C1015 is not set, the
following conditions may be present:

｠

Right or/and left wheels are rotated.

｠

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. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.

Q:Is the check result normal?

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-39

DIAGNOSIS

YES:

Go to Step 3.

NO:

Repair the CAN bus lines. (Refer to GROUP 54D - CAN

Bus Diagnostics table P.54D-17.) On completion, go to
Step 2.

STEP 2. Diagnostic trouble code recheck after resetting
CAN bus lines

Q:Is DTC C101C set?

YES:

Go to Step 3.

NO:

The procedure is complete.

STEP 3. M.U.T.-III diagnostic trouble code
Check that the diagnostic trouble code No. C1015 is also set.

Q:Is DTC C1015 also set?

YES:

Perform the diagnosis for the diagnostic trouble

code No. C1015. (Refer to P.35C-18.)

NO:

Go to Step 4.

STEP 4. Check for wheel speed sensor installation
Check how the wheel speed sensor <FR> is installed
(Disconnection of wheel speed sensor, loose mounting bolt,
etc.).

Q:Is the check result normal?

YES:

Go to Step 5.

NO:

Reinstall the wheel speed sensor correctly.

STEP 5. Check for wheel speed sensor as a single unit

Q:Is the check result normal?

YES:

Go to Step 6.

NO:

Replace the wheel speed sensor.

STEP 6. Check for wheel bearing looseness

NOTE:

Loose wheel bearing may increase the gap between the

wheel speed sensor and the wheel speed detection magnet
encoder. Check the wheel bearing <FR> for looseness. (Refer
to GROUP 26 - On-vehicle Service P.26-8.)

Q:Is the check result normal?

YES:

Go to Step 7.

NO:

Replace the wheel bearing.

STEP 7. Check of wheel speed detection encoder

ZC601555

Oil seal

Magnetic
encoder

0000

Wheel
bearing

Check the encoder for adhesion of foreign materials or
deformation.

Q:Is the check result normal?

YES:

Go to Step 8.

NO:

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. When the encoder is deformed,
replace the wheel bearing.

35C-40

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS

STEP 8. Voltage measurement at the A-02 ASC-ECU
connector

ZC601293 0014

ASC-ECU

MB991997

Check harness

A-02 ASC-ECU
harness connector

(1)

Disconnect the connector, connect special tool MB991997 to
the harness-side connector, and measure the voltage at the
special tool connector side.

NOTE:

Do not connect the special tool MB991997 to ASC-

ECU.

(2)

Turn the ignition switch to the ON position.

(3)

Measure the voltage between the wheel speed sensor power
supply terminal (signal terminal) No.34/the ground terminal
No. 33 and the body ground.

OK: 0 volt

Q:Is the check result normal?

YES:

Go to Step 9.

NO (Not normal at the terminal No. 34 or 33):

Go to Step

10.

STEP 9. Resistance measurement at A-02 ASC-ECU
connector

ZC601293 0000

ASC-ECU

MB991997

Check harness

A-02 ASC-ECU
harness connector

(1)

Disconnect the connector, connect special tool MB991997 to
the harness-side connector, and measure the voltage at the
special tool connector side.

NOTE:

Do not connect the special tool MB991997 to ASC-

ECU.

(2)

Resistance between the wheel speed sensor power supply
terminal (signal terminal) No. 34/the ground terminal No. 33
and the body ground

OK: No continuity

Q:Is the check result normal?

YES:

Go to Step 11.

NO (Not normal at the terminal No. 34 or 33):

Go to Step

10.

STEP 10. Connector check: A-02 ASC-ECU connector, A-59
wheel speed sensor <FR> connector

Q:Is the check result normal?

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-41

DIAGNOSIS

YES:

The short circuit in the wheel speed sensor <FR>

circuit may be present. Repair the wiring harness between
the A-02 ASC-ECU connector terminal No. 34/33 and the A-59
wheel speed sensor <FR> connector terminal No. 1/2.

NO:

Repair the defective connector.

STEP 11. Voltage measurement at the A-02 ASC-ECU
connector

ZC601292 0002

ASC-ECU

MB991997

Check harness

A-02 ASC-ECU
harness connector

(1)

Disconnect the ASC-ECU connector, connect special tool
MB991997 to the ASC-ECU-side connector and harness-
side connector, and then measure the voltage at the special
tool connector side.

(2)

Turn the ignition switch to the ON position.

(3)

Measure the voltage between the wheel speed sensor circuit
power supply terminal (signal terminal) No. 34 and the body
ground.

OK: Approximately battery voltage

Q:Is the check result normal?

YES:

Go to Step 14.

NO:

Go to Step 12.

STEP 12. Connector check: A-02 ASC-ECU connector, A-59
wheel speed sensor <FR> connector

Q:Is the check result normal?

YES:

Go to Step 13.

NO:

Repair the defective connector.

STEP 13. Wiring harness check between A-02 ASC-ECU
connector terminal No. 34/33 and A-59 wheel speed sensor
<FR> connector terminal No. 1/2

｠

Check for the open circuit in the wheel speed sensor <FR>
circuit.

Q:Is the check result normal?

YES:

Replace the wheel speed sensor.

NO:

Repair the wiring harness.

STEP 14. Check whether the diagnostic trouble code is
reset.

(1)

Erase the diagnostic trouble code.

(2)

Drive the vehicle at 12mph (20 km/h) or more.

NOTE:

The ABS warning light does not turn OFF in some

cases unless the vehicle runs at 12mph (20 km/h) or
higher.

35C-42

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS