Mitsubishi Evolution X. Manual - part 1058

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-593

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the ASC-ECU.
NO :  The trouble can be an intermittent malfunction such 

as a poor connection or open circuit in the CAN bus 
lines between the ASC-ECU and the ETACS-ECU 
(Refer to GROUP 00, How to Cope with Intermittent 
Malfunction 

P.00-15

).

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the ETACS-ECU.
NO :  The trouble can be an intermittent malfunction such 

as a poor connection or open circuit in the CAN bus 
lines between the ASC-ECU and the ETACS-ECU 
(Refer to GROUP 00, How to Cope with Intermittent 
Malfunction 

P.00-15

).

DTC U0126: Steering wheel sensor CAN timeout

CAUTION

• If DTC U0126 is set to the ETACS-ECU, always 

diagnose the CAN bus line.

• Before replacing the ECU, ensure that the 

communication circuit is normal.

.

TROUBLE JUDGMENT

If the signal from steering wheel sensor cannot be 
received, the ETACS-ECU sets DTC U0126.

.

JUDGMENT CRITERIA

After the following statuses continue to be true for 5 
seconds, if the communication with the steering 
wheel sensor cannot be established for 0.6 second 
or more, the ETACS-ECU determines that a problem 
has occurred.

• No abnormality is present to the network.

• Ignition switch is in the ON position.

• No abnormality is present to the power supply 

fuse, or the odometer value is at 80.5 km (50.0 
miles) or more.

• ETACS-ECU system voltage is at 10−16 volts.

.

TROUBLESHOOTING HINTS

• The steering wheel sensor may be defective.

• The ETACS-ECU may be defective.

• The CAN bus may be defective.

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-594

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with 

CAN communication system)

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line. 

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the 

Scan Tool (M.U.T.-III) 

P.54A-579

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-14

).

STEP 2. Using scan tool MB991958, read the steering 
wheel sensor diagnostic trouble code.
Check if DTC is set to the steering wheel sensor.
Q: Is the DTC set?

YES : Troubleshoot the steering wheel sensor (Refer to 

GROUP 35C, Diagnosis 

P.35C-20

).

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read the ASC-ECU 
diagnostic trouble code.
Check if the DTC U0126 is set to the ASC-ECU.
Q: Is the DTC set?

YES : Go to Step 4.
NO :  Go to Step 5.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-595

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the steering wheel sensor.
NO :  The trouble can be an intermittent malfunction such 

as a poor connection or open circuit in the CAN bus 
lines between the steering wheel sensor and the 
ETACS-ECU (Refer to GROUP 00, How to Cope with 
Intermittent Malfunction 

P.00-15

).

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the ETACS-ECU.
NO :  The trouble can be an intermittent malfunction such 

as a poor connection or open circuit in the CAN bus 
lines between the steering wheel sensor and the 
ETACS-ECU (Refer to GROUP 00, How to Cope with 
Intermittent Malfunction 

P.00-15

).

DTC U0136: S-AWC-ECU CAN timeout

CAUTION

• If DTC U0136 is set to the ETACS-ECU, always 

diagnose the CAN bus line.

• Before replacing the ECU, ensure that the 

communication circuit is normal.

.

TROUBLE JUDGMENT

If the signal from S-AWC-ECU cannot be received, 
the ETACS-ECU sets DTC U0136.

.

JUDGMENT CRITERIA

After the following statuses continue to be true for 5 
seconds, if the communication with the S-AWC-ECU 
cannot be established for 0.6 second or more, the 
ETACS-ECU determines that a problem has 
occurred.

• No abnormality is present to the network.

• Ignition switch is in the ON position.

• No abnormality is present to the power supply 

fuse, or the odometer value is at 80.5 km (50.0 
miles) or more.

• ETACS-ECU system voltage is at 10−16 volts.

.

TROUBLESHOOTING HINTS

• The S-AWC-ECU may be defective.

• The ETACS-ECU may be defective.

• The CAN bus may be defective.

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-596

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with 

CAN communication system)

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the 

Scan Tool (M.U.T.-III) 

P.54A-579

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-14

).

STEP 2. Using scan tool MB991958, read the S-AWC-ECU 
diagnostic trouble code.
Check if DTC is set to the S-AWC-ECU.
Q: Is the DTC set?

YES : Troubleshoot the S-AWC (Refer to GROUP 22A, 

Diagnosis 

P.22A-11

).

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read the ASC-ECU 
diagnostic trouble code.
Check if the DTC U0136 is set to the ASC-ECU.
Q: Is the DTC set?

YES : Go to Step 4.
NO :  Go to Step 5.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB