Content .. 343 344 345 346 ..

Mitsubishi Evolution X. Manual - part 345

DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>

TSB Revision

MANUAL TRANSAXLE

22A-29

STEP 8. Wheel alignment check
Q: Is the check result normal?

YES : After checking the wheel alignment, calibrate the

steering wheel sensor (refer to GROUP 35C

−

On-vehicle Service

P.35C-267

,) and initialize

AWC-ECU steering angle correction amount (refer to

P.22A-113

.) Then go to Step 9.

NO : After adjusting the wheel alignment, calibrate the

steering wheel sensor (refer to GROUP 35C

−

On-vehicle Service

P.35C-267

,) and initialize

AWC-ECU steering angle correction amount (refer to

P.22A-113

.) Then go to Step 9.

STEP 9. Scan tool service data
Item 11: Steering wheel sensor (refer to

P.22A-107

Q: Is the check result normal?

YES : Go to Step 10.
NO : Replace the steering wheel sensor. (Refer to GROUP

35C

− Steering Wheel Sensor

P.35C-279

.) Then go to

Step 10.

STEP 10. Check whether the DTC is reset.
Q: Is DTC No. C123C set?

YES : Replace the AWC-ECU.(Refer to

P.22A-132

.) Then

go to Step 11.

NO : Intermittent malfunction. (Refer to GROUP 00

− How

to Cope with Intermittent Malfunction

P.00-15

STEP 11. Check whether the DTC is reset.
Q: Is DTC No. C123C set?

YES : Return to Step 1.
NO : This diagnosis is complete.

DTC C1242: G and Yaw Rate Sensor (Longitudinal G Output Data Error)

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.

• 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

P.35C-266

), and ini-

tialize the lateral/longitudinal acceleration
correction amount stored in AWC-ECU. (Refer

to item No.10: Lateral acceleration correction
amount initialization, and No. 11: Longitudinal
acceleration correction amount initialization

P.22A-113

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:

DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>

TSB Revision

MANUAL TRANSAXLE

22A-30

• 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 longitudinal G that is
output from the G and yaw rate sensor during
braking with the calculation value calculated by
the data from the wheel speed 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 stoplight switch

• Malfunction of AWC-ECU

• Malfunction of ASC-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

P.54C-14

.) After repairing the CAN

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. C1242 set?

YES : Go to Step 3.
NO : This diagnosis is complete.

STEP 3. Scan tool diagnostic trouble code
Check the ASC diagnostic trouble code. (Refer to GROUP 35C
− Troubleshooting

P.35C-20

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO : Go to Step 4.

STEP 4. Scan tool diagnostic trouble code
Q: Is DTC No. C2204 set?

YES : Perform the relevant troubleshooting.
NO : Go to Step 5.

STEP 5. Scan tool diagnostic trouble code
Check if the local CAN communication-related, stoplight
switch-related, or wheel speed sensor-related diagnostic trou-
ble code is set.
Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO : Go to Step 6.