Mitsubishi Outlander XL. Manual - part 667

PROBABLE CAUSES

｠

Wheel bearing malfunction

｠

Deformation of the wheel speed detection encoder

｠

Missing teeth of the wheel speed detection encoder

｠

Adhesion of foreign materials on the wheel speed detection
encoder

｠

ASC-ECU malfunction

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 DTC C1043 set?

YES:

 Go to Step 3.

NO:

 The procedure is complete.

STEP 3. 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 <RL> for looseness. <Refer
to GROUP 27A - On-vehicle Service P.27A-4(FWD) or GROUP 27B
- On-vehicle Service P.27B-15(AWD).>

Q:Is the check result normal?

YES:

 Go to Step 4.

NO:

 Replace the rear wheel hub assembly.

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-75

DIAGNOSIS

STEP 4. Check of wheel speed detection encoder

ZC601558 0000

Magnetic 
encoder

Rear hub 
assembly

Rear wheel bearing

Ball bearing

Rear hub 
assembly

Magnetic 
encoder

<FWD>

<AWD>

Check  the  encoder  for  adhesion  of  foreign  materials  or
deformation.

Q:Is the check result normal?

YES:

 Go to Step 5.

NO (Presence 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. When
the encoder is deformed, replace the rear hub assembly.

NO (Deformation):

 Replace the rear wheel hub assembly.

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 C1043 set?

YES:

 Replace the ASC-ECU.

NO:

 Intermittent malfunction. (Refer to GROUP 00 - How

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

35C-76

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS

DTC C1044: Abnormality in periodical signal for RR wheel speed sensor

M13506100025USA0000010000

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).

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
ASC-ECU monitors the signals from each wheel speed sensor
while the vehicle is being driven. If any periodical drop is found
in  these  sensor  signals,  ASC-ECU  will  set  the  relevant
diagnostic trouble code.

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-77

DIAGNOSIS

PROBABLE CAUSES

｠

Wheel bearing malfunction

｠

Deformation of the wheel speed detection encoder

｠

Missing teeth of the wheel speed detection encoder

｠

Adhesion of foreign materials on the wheel speed detection
encoder

｠

ASC-ECU malfunction

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 DTC C1044 set?

YES:

 Go to Step 3.

NO:

 The procedure is complete.

STEP 3. 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 <RR> for looseness. <Refer
to GROUP 27A - On-vehicle Service P.27A-4(FWD) or GROUP 27B
- On-vehicle Service P.27B-15(AWD).>

Q:Is the check result normal?

YES:

 Go to Step 4.

NO:

 Replace the rear wheel hub assembly.

35C-78

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS