Mitsubishi Lancer Evolution X. Manual — part 178
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-177
STEP 5. Check whether the DTC is reset.
Q: Is DTC C1210 set?
YES : Replace the G and yaw rate sensor. (Refer to
.) Then go to Step 6.
NO : The procedure is complete.
STEP 6. Check whether the DTC is reset.
Q: Is DTC C1210 set?
YES : Replace the hydraulic unit (incorporates in
.) Then go to Step 7.
NO : Intermittent malfunction. (Refer to GROUP 00 − How
to Cope with Intermittent Malfunction
.)
STEP 7. Check whether the DTC is reset.
Q: Is DTC C1210 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC C1242: Abnormality in G and yaw rate sensor (longitudinal G sensor)
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.
• Whenever the ECU is replaced, ensure that the CAN
bus lines are normal.
• Do not drop the G and yaw rate sensor or subject it to a
shock.
• When the G and yaw rate sensor is replaced, always
perform the calibration to make ASC-ECU learn the
neutral point. (Refer to
.)
• When the hydraulic unit (integrated with ASC-ECU) is
replaced, always perform the calibration of steering
wheel sensor, G and yaw rate sensor, brake fluid pres-
sure sensor, cut valve, and inlet valve.(Refer to
.)
.
CIRCUIT OPERATION
• ASC-ECU supplies power to the G and yaw rate sensor at
the terminal No. 1.
• The G and yaw rate sensor outputs the signal to ASC-ECU
via the local CAN bus lines.
.
DTC SET CONDITIONS
This diagnostic trouble code is set when an abnormality is
detected by a comparison of the longitudinal G value output
from G and yaw rate sensor with the wheel speed value output
from wheel speed sensor.
.
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-178
PROBABLE CAUSES
• Improper installation of the G and yaw rate sensor
• G and yaw rate sensor malfunction
• Wheel speed sensor malfunction
• ASC-ECU malfunction
• External noise interference
NOTE: This DTC may be set also when the vehicle is driven on
the four-wheel drum tester.
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
STEP 1. Using scan tool MB991958, diagnose the CAN bus
lines.
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines. (Refer to GROUP 54C −
Troubleshooting
.) After repairing the CAN
bus line, go to Step 2.
STEP 2. Check for diagnostic trouble codes of other
systems
Check if diagnostic trouble code No. U0125 is also set in
ASC-ECU.
Q: Is DTC U0125 set?
YES : Perform troubleshooting for the diagnostic trouble
.) Then go to
Step 3.
NO : Go to Step 3.
STEP 3. Check whether the DTC is reset.
Q: Is DTC C1242 set?
YES : Go to Step 4.
NO : This diagnosis is complete.
STEP 4. Check of wheel speed sensor-related diagnostic
trouble code
Using scan tool MB991958, check if the wheel speed sen-
sor-related diagnostic trouble code is set. (Refer to
Q: Is any DTC set?
YES : Perform troubleshooting for the diagnostic trouble
NO : Go to Step 5.
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-179
STEP 5. G and yaw rate sensor check
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 6.
NO : Reinstall the G and yaw rate sensor correctly. (Refer
to
STEP 6. Scan tool service data
Check the following service data. (Refer to
.)
• Item 09: G sensor
• Item 96: G sensor offset
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the G and yaw rate sensor. (Refer to
.) Then go to Step 7.
STEP 7. Check whether the DTC is reset.
Q: Is DTC C1242 set?
YES : Replace the hydraulic unit (incorporates in
.) Then go to Step 8.
NO : Intermittent malfunction. (Refer to GROUP 00 − How
to Cope with Intermittent Malfunction
.)
STEP 8. Check whether the DTC is reset.
Q: Is DTC C1242 set?
YES : Return to Step 1.
NO : The procedure is complete.
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-180
DTC C123C: Abnormality in G and yaw rate sensor (lateral G or yaw rate)
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.
• Whenever the ECU is replaced, ensure that the CAN
bus lines are normal.
• When the steering wheel sensor is replaced, always
perform calibration to make ASC-ECU learn the neutral
point. (Refer to
.)
• Do not drop the G and yaw rate sensor or subject it to a
shock.
• When the G and yaw rate sensor is replaced, always
perform the calibration to make ASC-ECU learn the
neutral point. (Refer to
.)
• When the hydraulic unit (integrated with ASC-ECU) is
replaced, always perform the calibration of steering
wheel sensor, G and yaw rate sensor, brake fluid pres-
sure sensor, cut valve, and inlet valve.(Refer to
.)
.
CIRCUIT OPERATION
• ASC-ECU supplies power to the G and yaw rate sensor at
the terminal No. 1.
• The G and yaw rate sensor outputs the signal to ASC-ECU
via the local CAN bus lines.
.
DTC SET CONDITIONS
This diagnostic trouble code is set if any malfunction below is
found:
• Lateral G value or yaw rate value output from G and yaw
rate sensor is abnormal.
• When abnormality is detected by comparing the value out-
put from the lateral G and yaw rate with the one from the
steering wheel sensor and wheel speed sensor
.
PROBABLE CAUSES
• Improper installation of the G and yaw rate sensor
• G and yaw rate sensor malfunction
• Steering wheel sensor malfunction
• Improper installation of steering wheel sensor
• Malfunction of wheel speed sensor
• ASC-ECU malfunction
• External noise interference
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
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