Mitsubishi Outlander GS45X. Manual — part 420
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-107
STEP 7. Check for wheel speed sensor <RL> installation
Check how the wheel speed sensor <RL> is installed (Discon-
nection of wheel speed sensor <RL>, loose mounting bolt,
etc.).
Q: Is the check result normal?
YES : Go to Step 8.
NO : Reinstall the wheel speed sensor <RL> correctly
(Refer to
STEP 8. Check for wheel speed sensor <RL> output
current
Refer to
.
Q: Is the check result normal?
YES : Go to Step 9.
NO : Replace the wheel speed sensor <RL> (Refer to
). Then go to Step 12.
STEP 9. Check for wheel bearing looseness
NOTE:
.
•
Loose wheel bearing may increase the gap between the
wheel speed sensor <RL> and the wheel speed detection
magnet encoder.
•
Check the Rear wheel hub assembly <RL (FWD)> (Refer to
GROUP 27A
−
Wheel Bearing Play Check
•
Check the wheel bearing <RL (AWD)> for looseness (Refer
to GROUP 27B
−
).
Q: Is the check result normal?
YES : Go to Step 10.
NO (FWD) : Replace the rear wheel hub assembly <RL>
(Refer to GROUP 27A
− Rear axle hub assembly
NO (AWD) : Replace the wheel bearing <RL> (Refer to
GROUP 27B
− Rear axle hub assembly
).
Then go to Step 13.
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-108
STEP 10. Check of wheel speed detection encoder
Check the encoder for adhesion of foreign materials or defor-
mation.
Q: Is the check result normal?
YES : Go to Step 11.
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. Then go to Step 13.
NO <Deformation (FWD)> : Replace the rear wheel hub
assembly <RL> (Refer to GROUP 27A
− Rear axle
hub assembly
). Then go to Step 13.
NO <Deformation (AWD)> : Replace the wheel bearing
<RL> (Refer to GROUP 27B
− Rear axle hub
assembly
). Then go to Step 13.
STEP 11. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or higher.
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 C1048 set?
YES : Replace the wheel speed sensor <RL> (Refer to
). Then go to Step 12.
NO : Intermittent malfunction (Refer to GROUP 00
− How
to Use Troubleshooting/How to Cope with Intermittent
Malfunctions
).
STEP 12. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12 mph (20 km/h) or higher.
NOTE: The ABS warning light does not turn OFF in some
cases unless the vehicle runs at 12 mph (20 km/h) or
higher.
Q: Is DTC C1048 set?
YES : Replace the hydraulic unit (integrated with ASC-ECU)
(Refer to
NO : The procedure is complete.
AC704785
Rear hub
Oil seal
Ball bearing
Magnetic
encoder
AB
Magnetic
encoder
Rear hub
assembly
Rear wheel bearing
<FWD>
<AWD>
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-109
STEP 13. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12 mph (20 km/h) or higher.
NOTE: The ABS warning light does not turn OFF in some
cases unless the vehicle runs at 12 mph (20 km/h) or
higher.
Q: Is DTC C1048 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC C1049: RR wheel speed sensor control phase time exceeded
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)
AC901112
Connector: A-02
A-02 (B)
AF
AC901075BC
Connector: C-129
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-110
CAUTION
• If there is any problem in the CAN bus lines, an incor-
rect diagnostic trouble code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C
− CAN Bus Line Diagnostic Flow
• Whenever ECU is replaced, ensure that the CAN bus
lines are normal.
• When the hydraulic unit (integrated with ASC-ECU) is
replaced, always carry out the calibration of the steer-
ing wheel sensor, the G and yaw rate sensor and brake
fluid pressure sensor (Refer to
and
.
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 fre-
quency 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
AC901080AN
Connector: D-133
D-133 (B)
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