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
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