Mitsubishi Outlander XL. Manual - part 652

DTC SET CONDITIONS
ASC-ECU monitors the voltage fluctuation in each wheel speed
sensor circuit. If ASC-ECU detects the open or short circuit in
the circuit, it will set a DTC.

PROBABLE CAUSES

Current trouble

｠

Damaged wiring harness and connectors

｠

Noise interference

｠

Malfunction of wheel speed sensor

｠

ASC-ECU malfunction

Past trouble

｠

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).

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?

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 the diagnostic trouble code C100A set?

YES:

 Go to Step 3.

NO:

 The procedure is complete.

STEP 3. M.U.T.-III data list
Check the following service data.

｠

Item No.01: FL wheel speed sensor

Q:Is the check result normal?

YES:

 Intermittent malfunction. (Refer to GROUP 00 - How

to Cope with Intermittent Malfunction P.00-15.)

NO:

 Go to Step 4.

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-15

DIAGNOSIS

STEP 4. Voltage measurement at the A-02 ASC-ECU
connector

ZC601293 0001

ASC-ECU

MB991997

Check harness

A-02 ASC-ECU 
Harness connector

(1)

Disconnect  the  ASC-ECU  connector,  connect  special  tool
MB991997 to the harness-side connector, and then measure
the resistance 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. 45/the ground terminal
No. 46 and the body ground.

OK: 0 volt

Q:Is the check result normal?

YES:

 Go to Step 5.

NO (Not normal at the terminal No. 45 or 46):

 Go to Step

6.

STEP 5. Resistance measurement at A-02 ASC-ECU
connector

ZC601293 0002

ASC-ECU

MB991997

Check harness

A-02 ASC-ECU 
harness connector

(1)

Disconnect  the  ASC-ECU  connector,  connect  special  tool
MB991997 to the harness-side connector, and then measure
the resistance 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. 45/the ground terminal No. 46
and the body ground

OK: No continuity

Q:Is the check result normal?

YES:

 Go to Step 8.

NO (Not normal at the terminal No. 45 or 46):

 Go to Step

6.

STEP 6. Connector check: A-02 ASC-ECU connector, A-11
wheel speed sensor <FL> connector

Q:Is the check result normal?

35C-16

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS

YES:

 Go to Step 7.

NO:

 Repair the defective connector.

STEP 7. Wiring harness check between A-02 ASC-ECU
connector terminal No. 45/46 and A-11 wheel speed sensor
<FL> connector terminal No. 1/2

｠

Check for short circuit in wheel speed sensor <FL> circuit

Q:Is the check result normal?

YES:

 Replace the wheel speed sensor <FL>.

NO:

 Repair the wiring harness.

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

ZC601292 0001

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. 45 and the body
ground.

OK: Approximately battery voltage

Q:Is the check result normal?

YES:

 Go to Step 11.

NO:

 Go to Step 9.

STEP 9. Connector check: A-02 ASC-ECU connector, A-11
wheel speed sensor <FL> connector

Q:Is the check result normal?

YES:

 Go to Step 10.

NO:

 Repair the defective connector.

STEP 10. Wiring harness check between A-02 ASC-ECU
connector terminal No. 45/46 and A-11 wheel speed sensor
<FL> connector terminal No. 1/2

｠

Check for open circuit in wheel speed sensor <FL> circuit.

Q:Is the check result normal?

YES:

 Replace the wheel speed sensor.

NO:

 Repair the wiring harness.

STEP 11. Check for wheel speed sensor as a single unit
Refer to P.35C-197.

Q:Is the check result normal?

YES:

 Go to Step 12.

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-17

DIAGNOSIS

NO:

 Replace the wheel speed sensor.

STEP 12. 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.

Q:Is DTC C100A set?

YES:

 Replace the ASC-ECU.

NO:

 Intermittent malfunction. (Refer to GROUP 00 - How

to Cope with Intermittent Malfunction P.00-15.)

DTC C1015: Abnormality in FR wheel speed sensor circuit

M13506100011USA0000010000

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)

If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagnosis,
diagnose the CAN bus lines. (Refer to GROUP 54D, Trouble
code diagnosis P.54D-17).

35C-18

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS