Mitsubishi Lancer Evolution X. Manual — part 483
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
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MANUAL TRANSAXLE
22A-25
STEP 4. Scan tool diagnostic trouble code
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 the DTC set?
YES : Carry out the appropriate troubleshooting. Then go to
Step 9.
NO : Go to Step 5.
STEP 5. Check of steering wheel sensor installation status
Check that the steering wheel sensor is installed correctly.
(Refer to GROUP 35C − Steering Wheel Sensor
Q: Is the check result normal?
YES : Go to Step 6.
NO : Install the steering wheel sensor correctly. Then go to
Step 6.
STEP 6. Wheel alignment check
Q: Is the check result normal?
YES : After checking the wheel alignment, calibrate the
steering wheel sensor (refer to GROUP 35C −
,) and initialize
AWC-ECU steering angle correction amount (refer to
.) Then, go to Step 7.
NO : After adjusting the wheel alignment, calibrate the
steering wheel sensor (refer to GROUP 35C −
,) and initialize
AWC-ECU steering angle correction amount (refer to
.) Then, go to Step 7.
STEP 7. Scan tool service data
Item 11: Steering wheel sensor (refer to
.)
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the steering wheel sensor. (Refer to GROUP
35C − Steering Wheel Sensor
.) Then, go to
Step 9.
STEP 8. Check whether the DTC is reset.
Q: Is DTC No. C1219 set?
YES : Replace the AWC-ECU.(Refer to
.) Then,
go to Step 9.
NO : Intermittent malfunction. (Refer to GROUP 00 − How
to Cope with Intermittent Malfunction
.)
STEP 9. Check whether the DTC is reset.
Q: Is DTC No. C1219 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
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MANUAL TRANSAXLE
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DTC C121A: Steering Wheel Sensor System (neutral learning abnormality)
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect 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,
calibrate the steering wheel sensor (refer to
GROUP 35C − On-vehicle Service
and initialize the steering angle correction
amount stored in AWC-ECU. (Item No.1:
Steering angle correction amount initializa-
tion
.
OPERATION
Steering wheel sensor stores the neutral position
learned by the scan tool. When the neutral position
has not been learned, the steering wheel sensor out-
puts the signal indicating that the learning has not
been performed.
.
DTC SET CONDITIONS
This DTC is set when it is detected that the steering
wheel sensor has not learned the neutral position.
.
PROBABLE CAUSES
• Steering wheel sensor neutral point not learned
• Malfunction of steering wheel sensor
• Malfunction of AWC ECU
DIAGNOSTIC PROCEDURE
STEP 1. Scan tool CAN bus diagnostics
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. Check whether the DTC is reset.
Q: Is DTC No. C121A set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Steering wheel sensor calibration
Perform calibration of the steering wheel sensor. (Refer to
GROUP 35C − On-vehicle Service
Q: Has the calibration succeeded?
YES : Go to Step 4.
NO : Replace the steering wheel sensor. (Refer to GROUP
35C − Steering Wheel Sensor
.) Then, go to
Step 4.
STEP 4. Check whether the DTC is reset.
Q: Is DTC No. C121A set?
YES : Replace the AWC-ECU.(Refer to
.) Then,
go to Step 5.
NO : Intermittent malfunction. (Refer to GROUP 00 − How
to Cope with Intermittent Malfunction
.)
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
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MANUAL TRANSAXLE
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STEP 5. Check whether the DTC is reset.
Q: Is DTC No. C121A set?
YES : Return to Step 1.
NO : This diagnosis is complete.
DTC C123C: G and Yaw Rate Sensor (Faulty Signal)
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect 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,
calibrate the steering wheel sensor (refer to
GROUP 35C − On-vehicle Service
and initialize the steering angle correction
amount stored in AWC-ECU. (Item No.1:
Steering angle correction amount initializa-
tion
• Do not drop the G and yaw rate sensor or sub-
ject it to a shock.
• When G and yaw rate sensor is replaced, cali-
brate G and yaw rate sensor (refer to GROUP
35C − On-vehicle Service
), and ini-
tialize the lateral/longitudinal acceleration
correction amount stored in AWC-ECU. (Refer
to item No.2: Lateral acceleration correction
amount initialization, and No.3: Longitudinal
acceleration correction amount initialization
.)
.
OPERATION
The G and yaw rate sensor outputs the signal to
ASC-ECU and AWC-ECU via the special CAN bus
lines.
.
DTC SET CONDITIONS
This diagnostic trouble code is set when the abnor-
mality below is detected:
• Abnormality in G and yaw rate sensor output
value
• This diagnostic trouble code is set when
AWC-ECU determines that an abnormality is
present by comparing the measurement values of
G and yaw rate sensor with the calculation value
of G and yaw rate calculated by the measure-
ment values of the wheel speed sensor and
steering wheel sensor.
.
PROBABLE CAUSES
• Improper installation of G and yaw rate sensor
• Malfunction of G and yaw rate sensor
• Malfunction of wheel speed sensor
• Malfunction of steering wheel sensor
• Malfunction of AWC-ECU
DIAGNOSTIC PROCEDURE
STEP 1. Scan tool CAN bus diagnostics
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. Check whether the DTC is reset.
Q: Is DTC No. C123C set?
YES : Go to Step 3.
NO : This diagnosis is complete.
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
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MANUAL TRANSAXLE
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STEP 3. Scan tool diagnostic trouble code
Q: Is DTC No. C2204 set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
STEP 4. Scan tool diagnostic trouble code
Check if the local CAN communication-related, wheel speed
sensor-related, or steering wheel sensor-related diagnostic
trouble code is set.
Q: Is the DTC set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 5.
STEP 5. Check of G and yaw rate sensor installation status
Check that the G and yaw rate sensor is installed correctly.
(Refer to GROUP 35C − G and Yaw Rate Sensor
Q: Is the check result normal?
YES : Go to Step 6.
NO : Reinstall the G and yaw rate sensor correctly. Then
go to Step 6.
STEP 6. Scan tool service data
Check the following service data. (Refer to
.)
• Item No. 26: Yaw rate sensor
• Item No. 29: Lateral G sensor
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the G and yaw rate sensor. (Refer to
GROUP 35C − G and Yaw Rate Sensor
Then go to Step 11.
STEP 7. Check of steering wheel sensor installation status
Check that the steering wheel sensor is installed correctly.
(Refer to GROUP 35C − Steering Wheel Sensor
Q: Is the check result normal?
YES : Go to Step 8.
NO : Install the steering wheel sensor correctly. Then go to
Step 8.
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