Mitsubishi Lancer Evolution X. Manual — part 182
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-193
STEP 6. Master cylinder pressure sensor calibration
Perform calibration of the brake fluid pressure sensor. ( Refer
to
Q: Has the calibration succeeded?
YES : Go to Step 7.
NO : Replace the hydraulic unit (incorporates in
.) Then go to Step 8.
STEP 7. Check whether the DTC is reset.
Q: Is DTC C123A 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 C123A set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC C1219: Abnormality in steering wheel sensor signal
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, after turning the ignition switch ON and OFF
(vehicle information from ETACS-ECU is registered),
always perform the calibration of steering wheel sen-
sor, G and yaw rate sensor, brake fluid pressure sen-
sor, cut valve, and inlet valve.(Refer to
, and
.)
.
CIRCUIT OPERATION
Steering wheel sensor outputs the signal to ASC-ECU via CAN
bus lines.
.
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-194
DTC SET CONDITIONS
This diagnostic trouble code is set if any malfunction below is
found:
• The tolerance of the neutral position of steering wheel sen-
sor exceeds the specified range.
• Abnormality in steering wheel sensor output value
• Abnormality is detected by a comparison of output value
from the steering wheel sensor with the output values from
wheel speed sensor and G and yaw rate sensor.
.
PROBABLE CAUSES
• Improper installation of steering wheel sensor
• Wheel alignment not performed
• Steering wheel sensor malfunction
• Different steering wheel
• G and yaw rate sensor malfunction
• Wheel speed sensor malfunction
• 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
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 3.
NO : Repair the CAN bus lines. (Refer to GROUP 54C −
Troubleshooting
.) After repairing the CAN
bus line, go to Step 2.
STEP 2. DTC recheck after repairing the CAN bus line
Q: Is DTC C1219 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Check the DTC.
Check if the wheel speed sensor-related, G and yaw rate sen-
sor-related, or steering wheel sensor-related diagnostic trouble
code is set.
Q: Is any DTC set?
YES : Troubleshoot the relevant diagnostic trouble code,
and then go to Step 8.
NO : Go to Step 4.
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-195
STEP 4. Check of steering wheel sensor installation status
Check that the steering wheel sensor is installed correctly.
(Refer to
Q: Is the check result normal?
YES : Go to Step 5.
NO : Install the steering wheel sensor correctly. (Refer to
.) Then go to Step 5.
STEP 5. Wheel alignment check
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 6.
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 6.
STEP 6. Scan tool service data
Check the following service data. (Refer to
.)
• Item 11: Steering angle sensor
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the steering wheel sensor.(Refer to
.) Then go to Step 8.
STEP 7. Check whether the DTC is reset.
Q: Is DTC C1219 set?
YES : Replace the hydraulic unit (incorporates in
.) Then go to Step 8.
NO : The procedure is complete.
STEP 8. Check whether the DTC is reset.
Q: Is DTC C1219 set?
YES : Return to Step 1.
NO : The procedure is complete.
DIAGNOSIS
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ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-196
DTC C121A: Abnormality in steering wheel sensor initialization
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
.)
• When the hydraulic unit (integrated with ASC-ECU) is
replaced, after turning the ignition switch ON and OFF
(vehicle information from ETACS-ECU is registered),
always perform the calibration of steering wheel sen-
sor, G and yaw rate sensor, brake fluid pressure sen-
sor, cut valve, and inlet valve.(Refer to
, and
.)
.
CIRCUIT OPERATION
Steering wheel sensor stores the neutral position learned using
scan tool MB991958. When the neutral position has not been
learned, the steering wheel sensor outputs the signal indicating
that the learning has not been performed.
.
DTC SET CONDITIONS
This diagnostic trouble code is set when it is detected that the
steering wheel sensor has not learned the neutral position.
.
PROBABLE CAUSES
• Neutral position of steering wheel sensor not learned
• Steering wheel sensor malfunction
• 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
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 3.
NO : Repair the CAN bus lines. (Refer to GROUP 54C −
Troubleshooting
.) After repairing the CAN
bus line, go to Step 2.
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