Mitsubishi Outlander GS45X. Manual — part 428
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-139
STEP 8. Check the wiring harness between C-312
ETACS-ECU connector terminal No.16 and C-133 stoplight
relay connector terminal No.2
• Check the signal line for open circuit.
Q: Is the check result normal?
YES : Go to Step 9.
NO : Replace the wiring harness.
STEP 9. Diagnostic trouble code recheck
Erase the DTC.
Q: Is diagnostic trouble code No.C1000 set?
YES : Replace the hydraulic unit (integrated with ASC-ECU)
(Refer to
NO : Intermittent malfunction (Refer to GROUP 00
− How
to Use Troubleshooting/How to Cope with Intermittent
Malfunctions
).
STEP 10. Diagnostic trouble code recheck
Erase the DTC.
Q: Is diagnostic trouble code No.C1000 set?
YES : Return to Step 1.
NO : The procedure is complete.
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-140
35C
DTC C123B: Prolonged operation of ASC
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 steering wheel sensor is replaced, always
carry out calibration to make ASC-ECU learn the neu-
tral point (Refer to
).
• Do not drop or shock the G and yaw rate sensor.
• When the G and yaw rate sensor is replaced, always
carry out calibration to make ASC-ECU learn the neu-
tral point (Refer to
).
• 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
ASC-ECU controls ASC by calculating the data sent from the
wheel speed sensor, the steering wheel sensor, and the G and
yaw rate sensor.
.
DTC SET CONDITIONS
This diagnostic trouble code is set when ASC operates for a
prolonged period.
NOTE: When the vehicle runs on a slippery or rough road, or
when the vehicle makes the steady turn, this diagnostic trouble
code may be set.
.
PROBABLE CAUSES
• Steering wheel sensor malfunction
• G and yaw rate sensor malfunction
• Improper installation of wheel speed sensor, steering wheel
sensor, or G and yaw rate sensor
• ASC-ECU malfunction
• Different steering wheel
• Wheel alignment not performed
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
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-141
STEP 1. Using scan tool MB991958, diagnose the CAN bus
lines.
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 54C
−
CAN Bus Diagnostics Table
). On
completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines
Q: Is DTC C123B set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Check the wheel speed sensor, and G and yaw
rate sensor-related DTC.
Check that DTCs C100A, C1015, C1020, C102B, C1011,
C101C, C1027, C1032, C1014, C101F, C102A, C1035, C1041,
C1042, C1043, C1044, C1219, C2205, C123C, and C2204 are
also set.
Q: Are DTCs C100A, C1015, C1020, C102B, C1011, C101C,
C1027, C1032, C1014, C101F, C102A, C1035, C1041,
C1042, C1043, C1044, C1219, C2205, C123C, and C2204
also set?
YES : Carry out the diagnosis for the relevant diagnostic
trouble codes, and then go to Step 10.
NO : Go to Step 4.
STEP 4. Check of G and yaw rate sensor installation status
Check that the G and yaw rate sensor is installed correctly.
Q: Is the check result normal?
YES : After checking the G and yaw rate sensor, perform
the calibration of the G and yaw rate sensor to make
ASC-ECU relearn the neutral point (Refer to
). Then go to Step 5.
NO : Reinstall the G and yaw rate sensor correctly (Refer
to
STEP 5. Using scan tool MB991958, check the data list
Check the following data list (Refer to
• Item 08: Lateral G sensor
• Item 09: G sensor
• Item 12: Yaw rate sensor
Q: Is the check result normal?
YES : Go to Step 6.
NO : Replace the G and yaw rate sensor (Refer to
). Then go to Step 10.
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-142
STEP 6. Check of steering wheel sensor installation status
Check that the steering wheel sensor is installed correctly.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Install the steering wheel sensor correctly (Refer to
). Then go to Step 7.
STEP 7. Wheel alignment check
Refer to GROUP 33
− On-vehicles service/Front Wheel Align-
ment Check and Adjustment
Q: Is the check result normal?
YES : After checking the wheel alignment, perform the
calibration of steering wheel sensor to make
ASC-ECU relearn the neutral point (Refer to
). Then go to Step 8.
NO : After adjusting the wheel alignment, perform the
calibration of steering wheel sensor to make
ASC-ECU relearn the neutral point (Refer to
). Then go to Step 8.
STEP 8. Using scan tool MB991958, check the data list
Check the following data list (Refer to
• Item 11: Steering angle
Q: Is the check result normal?
YES : Go to Step 9.
NO : Replace the steering wheel sensor (Refer to
). Then go to Step 10.
STEP 9. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or higher.
Q: Does ASC unnecessary activation occur or is the DTC
C123B set?
YES : Replace the hydraulic unit (integrated with ASC-ECU)
(Refer to
NO : Intermittent malfunction (Refer to GROUP 00
− How
to Use Troubleshooting/How to Cope with Intermittent
Malfunctions
).
STEP 10. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or higher.
Q: Does ASC unnecessary activation occur or is the DTC
C123B set?
YES : Return to Step 1.
NO : The procedure is complete.
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