Mitsubishi Outlander XL. Manual - part 669

STEP 7. Connector check: A-02 ASC-ECU connector, A-11
wheel speed sensor <FL> connector

Q:Is the check result normal?

YES:

 Go to Step 8.

NO:

 Repair the defective connector.

STEP 8. 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 9. 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 12.

NO:

 Go to Step 10.

STEP 10. Connector check: A-02 ASC-ECU connector, A-11
wheel speed sensor <FL> connector

Q:Is the check result normal?

YES:

 Go to Step 11.

NO:

 Repair the defective connector.

STEP 11. 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.

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-83

DIAGNOSIS

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 C1046 set?

YES:

 Replace the ASC-ECU, and then go to Step 13.

NO:

 The procedure is complete.

STEP 13. 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 C1046 set?

YES:

 Intermittent malfunction. (Refer to GROUP 00 - How

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

NO:

 The procedure is complete.

DTC C1047: FR wheel speed sensor control phase time exceeded

M13506100027USA0000010000

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)

35C-84

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS

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).

CIRCUIT 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
frequency 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
This diagnostic trouble code 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

｠

ASC-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

｠

MB991997: ASC check harness

STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-85

DIAGNOSIS

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 DTC C1047 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 codes C1015, C101C, C101F,
and C1042 are also set.

Q:Are DTC C1015, C101C, C101F, and C1042 also set?

YES:

 Carry out the diagnosis for the relevant diagnostic

trouble codes, and then go to Step 5.

NO:

 Go to Step 4.

STEP 4. 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 C1047 set?

YES:

 Replace the ASC-ECU, and then go to Step 5.

NO:

 The procedure is complete.

STEP 5. 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 C1047 set?

YES:

 Intermittent malfunction. (Refer to GROUP 00 - How

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

NO:

 The procedure is complete.

35C-86

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS