Mitsubishi Lancer Evolution X. Manual - part 484

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

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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-289

,) and initialize 

AWC-ECU steering angle correction amount (refer to 

P.22A-114

.) 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-289

,) and initialize 

AWC-ECU steering angle correction amount (refer to 

P.22A-114

.) 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-305

.) 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-133

.) 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-287

), 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 

P.22A-114

.)

.

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)>

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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-15

.) 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-22

.)

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.

STEP 6. 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 

P.35C-304

.)

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Reinstall the G and yaw rate sensor correctly. Then 

go to Step 7.

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

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MANUAL TRANSAXLE

22A-31

STEP 7. Scan tool service data
Item No. 31: Longitudinal G sensor (refer to 

P.22A-107

.)

Q: Is the check result normal?

YES : Go to Step 8.
NO :  Replace the G and yaw rate sensor. (Refer to 

GROUP 35C − G and Yaw Rate Sensor 

P.35C-304

.) 

Then go to Step 8. 

STEP 8. Check whether the DTC is reset.
Q: Is DTC No. C1242 set?

YES : Replace the AWC-ECU.(Refer to 

P.22A-133

.) Then 

go to Step 9. 

NO :  Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 9. Check whether the DTC is reset.
Q: Is DTC No. C1242 set?

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

DTC C1610: AWC Actuator Power Supply Electronic Relay Malfunction

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.

.

OPERATION

A relay is incorporated in AWC-ECU, and the power 
is supplied to the actuator via this relay.

.

DTC SET CONDITIONS

When the actuator power supply relay in AWC-ECU 
is seized, the code is set.

.

PROBABLE CAUSES

• 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 

P.54C-15

.) After repairing the CAN 

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. C1610 set?

YES : Replace the AWC-ECU.(Refer to 

P.22A-133

.)

NO :  This diagnosis is complete.

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

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MANUAL TRANSAXLE

22A-32

STEP 3. Check whether the DTC is reset.
Q: Is DTC No. C1610 set?

YES : Replace the AWC-ECU.(Refer to 

P.22A-133

.)

NO :  Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

DTC C1611: AWC Pressure Sensor System (Low Voltage)

AC902086

PRESSURE 
SENSOR

AWC-ECU

AWC pressure sensor system circuit

AB

AC708950CG

Connector: C-46

AC708955

Connector: D-11

AO