Mitsubishi Evolution X. Manual - part 1057

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-589

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 TC-SST-ECU.
NO :  The trouble can be an intermittent malfunction such 

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

P.00-15

).

DTC U0103: Shift lever CAN timeout

CAUTION

• If DTC U0103 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 shift lever cannot be received, the 
ETACS-ECU sets DTC U0103.

.

JUDGMENT CRITERIA

After the following statuses continue to be true for 5 
seconds, if the communication with the shift lever 
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 shift lever may be defective.

• The ETACS-ECU may be defective.

• The CAN bus may be defective.

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-590

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 shift lever 
diagnostic trouble code.
Check if DTC is set to the shift lever (Refer to GROUP 22C, 
Diagnosis 

P.22C-302

).

Q: Is the DTC set?

YES : Troubleshoot the shift lever.
NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read the TC-SST-ECU 
diagnostic trouble code.
Check if the DTC U0103 is set to the TC-SST-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-591

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 shift lever.
NO :  The trouble can be an intermittent malfunction such 

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

P.00-15

).

DTC U0121: ASC-ECU CAN timeout

CAUTION

• If DTC U0121 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 ASC-ECU cannot be received, the 
ETACS-ECU sets DTC U0121.

.

JUDGMENT CRITERIA

After the following statuses continue to be true for 5 
seconds, if the communication with the ASC-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 ASC-ECU may be defective.

• The ETACS-ECU may be defective.

• The CAN bus may be defective.

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-592

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 ASC 
diagnostic trouble code.
Check if DTC is set to the ASC-ECU.
Q: Is the DTC set?

YES : Troubleshoot the ASC (Refer to GROUP 35C, 

Diagnosis 

P.35C-20

).

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read the TC-SST 
diagnostic trouble code.
Check if the DTC U0121 is set to the TC-SST-ECU.
Q: Is the DTC set?

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

AC608435

Data link connector

MB991827

MB991824

MB991910

AB