Mitsubishi Outlander XL. Manual - part 663

｠

Wheel speed sensor signal continuously indicates low value.

PROBABLE CAUSES

Current trouble

｠

Excessive  gap  between  the  wheel  speed  sensor  and  the
wheel speed detection encoder

｠

Wheel bearing malfunction

｠

Deformation of the wheel speed detection encoder

｠

Adhesion of foreign materials on the wheel speed sensor

｠

Adhesion of foreign materials on the wheel speed detection
encoder

｠

Malfunction of wheel speed sensor

｠

Improper installation of the wheel speed sensor

｠

ASC-ECU malfunction

Past trouble

｠

When the diagnostic trouble code 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 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?

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 C101F set?

YES:

 Go to Step 3.

NO:

 The procedure is complete.

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-59

DIAGNOSIS

STEP 3. M.U.T.-III diagnostic trouble code
Check that the diagnostic trouble code 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 (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.

NO (Deformation):

 Replace the wheel bearing.

STEP 8. 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 C101F set?

YES:

 Replace the ASC-ECU.

NO:

 Intermittent malfunction. (Refer to GROUP 00 - How

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

35C-60

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS

DTC No. C102A: Mutual monitoring of RL wheel speed sensor

M13506100020USA0000010000

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 fault below is found in
these sensor signals, ASC-ECU will set the relevant diagnostic
trouble code.

｠

Missing wheel speed sensor signal

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-61

DIAGNOSIS

｠

Wheel speed sensor signal continuously indicates low 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

｠

Wheel bearing malfunction

｠

Deformation of the wheel speed detection encoder

｠

Adhesion of foreign materials on the wheel speed detection
encoder

｠

Malfunction of wheel speed sensor

｠

Improper installation of the wheel speed sensor

｠

ASC-ECU malfunction

Past trouble

｠

When the diagnostic trouble code C1020 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 (Refer to GROUP 00 - How to Cope with Intermittent
Malfunction P.00-15).

｠

When  the  diagnostic  trouble  code  C1020  is  not  set,  the
following conditions may be present:

｠

Right or 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?

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 C102A set?

YES:

 Go to Step 3.

NO:

 The procedure is complete.

35C-62

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS