Mitsubishi Evolution X. Manual — part 361

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-14

.)

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

− Troubleshooting

P.54A-582

.)

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.00-39

.)

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-676

.)

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-132

.) 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)>

TSB Revision

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-14

.)

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

− Troubleshooting

P.22C-10

.)

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-132

.) 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)>

TSB Revision

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-14

.)

STEP 2. 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 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-132

.) 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-14

.)

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

P.22A-11

.)

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-20

.)

Q: Is the DTC set?

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