Mitsubishi Outlander XL. Manual — part 657
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 C1011 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 code No. C100A is also set.
Q:Is DTC C100A also set?
YES:
Perform the diagnosis for the diagnostic trouble
code No. C100A. (Refer to P.35C-14.)
NO:
Go to Step 4.
STEP 4. Check for wheel speed sensor installation
Check how the wheel speed sensor <FL> 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 <FL> 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:
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 wheel bearing.
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-35
DIAGNOSIS
STEP 8. 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 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 9.
NO (Not normal at the terminal No. 45 or 46):
Go to Step
10.
STEP 9. 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 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 11.
NO (Not normal at the terminal No. 45 or 46):
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?
35C-36
ACTIVE SKID CONTROL SYSTEM (ASC)
DIAGNOSIS
YES:
The short circuit in the wheel speed sensor <FL>
circuit may be present. Repair the wiring harness between
the A-02 ASC-ECU connector terminal No. 45/46 and the A-11
wheel speed sensor <FL> connector terminal No. 1/2.
NO:
Repair the defective connector.
STEP 11. 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 14.
NO:
Go to Step 12.
STEP 12. Connector check: A-02 ASC-ECU connector, A-11
wheel speed sensor <FL> connector
Q:Is the check result normal?
YES:
Go to Step 13.
NO:
Repair the defective connector.
STEP 13. 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 14. 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 C1011 set?
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-37
DIAGNOSIS
YES:
Replace the ASC-ECU.
NO:
Intermittent malfunction. (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction P.00-15.)
DTC C101C Abnormality in FR wheel speed sensor signal
M13506100015USA0000010000
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.
35C-38
ACTIVE SKID CONTROL SYSTEM (ASC)
DIAGNOSIS
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