Mitsubishi Lancer Evolution X. Manual - part 500

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

TSB Revision

MANUAL TRANSAXLE

22A-93

DTC U1417: Coding Data 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 communication circuit is normal.

• When the diagnostic trouble code No. U1417 

is set in AWC-ECU, the diagnostic trouble 
code may also be set in ETACS-ECU. When 
the diagnostic trouble code is set in 
ETACS-ECU, perform the diagnosis of the 
diagnostic trouble code for ETACS-ECU first.

.

OPERATION

AWC-ECU receives the vehicle information stored in 
ETACS-ECU via CAN bus lines.

.

DTC SET CONDITIONS

The code is set when the vehicle information 
received from ETACS-ECU is not correct.

.

PROBABLE CAUSES

• The CAN bus line is defective.
• Malfunction of the ETACS-ECU
• Malfunction of AWC-ECU
• ETACS-ECU has been interchanged between 

two vehicles.

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 2.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C − 

Troubleshooting 

P.54C-15

.)

STEP 2. Scan tool diagnostic trouble code
Check the ETACS diagnostic trouble code. (Refer to GROUP 
54A − Troubleshooting 

P.54A-646

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO :  Go to Step 3.

STEP 3. ETACS-ECU coding data check
Using the scan tool, check if there is any abnormality to the 
coding data stored in the ETACS-ECU. (Refer to GROUP 00 − 

Coding Reference Table 

P.00-26

.)

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Repair the coding data or replace ETACS-ECU. 

(Refer to GROUP 54A − ETACS-ECU 

P.54A-742

.) 

Then go to Step 5.

STEP 4. Check whether the DTC is reset.
Q: Is DTC No. U1417 set?

YES : Replace the AWC-ECU.(Refer to 

P.22A-133

.) Then 

go to Step 5.

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

to Cope with Intermittent Malfunction 

P.00-15

.)

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

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MANUAL TRANSAXLE

22A-94

STEP 5. Check whether the DTC is reset.
Q: Is DTC No. U1417 set?

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

DTC U1425: TC-SST 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.

.

OPERATION

AWC-ECU communicates with TC-SST-ECU via the 
CAN bus lines.

.

DTC SET CONDITIONS

The code is set when abnormality is detected in the 
signal received from the TC-SST-ECU.

.

PROBABLE CAUSES

• The CAN bus line is defective.
• Malfunction of TC-SST-ECU
• 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 2.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C − 

Troubleshooting 

P.54C-15

.)

STEP 2. Scan tool diagnostic trouble code
Check the TC-SST diagnostic trouble code. (Refer to GROUP 
22C − Troubleshooting 

P.22C-15

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO :  Go to Step 3.

STEP 3. Scan tool service data
Item No. 17: T/M shift range (Refer to 

P.22A-107

.)

Q: Is the check result normal?

YES : Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

NO :  Go to Step 4.

STEP 4. Check whether the DTC is reset.
Q: Is DTC No. U1425 set?

YES : Replace the AWC-ECU.(Refer to 

P.22A-133

.) Then 

go to Step 5.

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

to Cope with Intermittent Malfunction 

P.00-15

.)

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

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MANUAL TRANSAXLE

22A-95

STEP 5. Check whether the DTC is reset.
Q: Is DTC No. U1425 set?

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

DTC U1426: ASC 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.

.

OPERATION

AWC-ECU communicates with the ASC-ECU via the 
CAN bus lines.

.

DTC SET CONDITIONS

The code is set when abnormality is detected in the 
signal received from the ASC-ECU.

.

PROBABLE CAUSES

• The CAN bus line is defective.
• Malfunction of ASC-ECU
• 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 2.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C − 

Troubleshooting 

P.54C-15

.)

STEP 2. 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 3.

STEP 3. Scan tool service data
Item No. 38: Master cylinder pressure sensor (Refer to 

P.22A-107

.)

Q: Is the check result normal?

YES : Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

NO :  Go to Step 4.

STEP 4. Check whether the DTC is reset.
Q: Is DTC No. U1426 set?

YES : Replace the AWC-ECU.(Refer to 

P.22A-133

.) Then 

go to Step 5.

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

to Cope with Intermittent Malfunction 

P.00-15

.)

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

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MANUAL TRANSAXLE

22A-96

STEP 5. Check whether the DTC is reset.
Q: Is DTC No. U1415 set?

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

DTC U1427: Wheel Speed Sensor 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.

.

OPERATION

AWC-ECU communicates with the ASC-ECU via the 
CAN bus lines.

.

DTC SET CONDITIONS

The code is set when abnormality is detected in the 
signal received from the wheel speed sensor.

.

PROBABLE CAUSES

• The CAN bus line is defective.
• Malfunction of the CAN bus line (local)
• Malfunction of ASC-ECU
• Malfunction of wheel speed 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 2.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C − 

Troubleshooting 

P.54C-15

.)

STEP 2. Scan tool diagnostic trouble code
Check if the AWC diagnostic trouble code No. U1003 is 
set.(Refer to 

P.22A-12

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO :  Go to Step 3.

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.