Mitsubishi Evolution X. Manual — part 794
DIAGNOSIS
TSB Revision
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-183
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 C123A set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Check for diagnostic trouble codes of other
systems
Check if the diagnostic trouble code is set related to the G and
yaw rate sensor, steering wheel sensor, and master cylinder
pressure sensor.
Q: Is any DTC set?
YES : Go to Step 4.
NO : Carry out the diagnosis for the diagnostic trouble code
that is set. (Refer to
.)
STEP 4. G and yaw rate sensor calibration
Perform calibration of the G and yaw rate sensor. ( Refer to
.)
Q: Has the calibration succeeded?
YES : Go to Step 5.
NO : Replace the hydraulic unit (incorporates in
.) Then go to Step 8.
STEP 5. Steering wheel sensor calibration
Perform calibration of the steering wheel sensor. ( Refer to
.)
Q: Has the calibration succeeded?
YES : Go to Step 6.
NO : Replace the hydraulic unit (incorporates in
.) Then go to Step 8.
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DIAGNOSIS
TSB Revision
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-184
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
TSB Revision
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-185
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 SKID CONTROL SYSTEM (ASC)
35C-186
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.
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