Mitsubishi Lancer Evolution X. Manual - part 604

DIAGNOSIS <SHIFT LEVER>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-373

DTC U0001: Bus-off

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.

.

DTC SET CONDITIONS

The shift lever-ECU ceases communication (bus-off).

.

PROBABLE CAUSES

• The CAN bus line is defective.
• Malfunction of the shift lever-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

.) After repairing the CAN 

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. U0001 set?

YES : Replace the shift lever assembly. (Refer to 

P.22C-404

.)

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

to Cope with Intermittent Malfunction 

P.00-15

.)

DTC U0100: Engine Time-out 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.

.

DTC SET CONDITIONS

The periodic communication data from the engine 
control module cannot be received.

.

PROBABLE CAUSES

• The CAN bus line is defective.
• Malfunction of engine control module
• Malfunction of the shift lever-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using the scan tool, 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

.) After repairing the CAN 

bus line, go to Step 2.

DIAGNOSIS <SHIFT LEVER>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-374

STEP 2. Scan tool diagnostic trouble code
Check the engine diagnostic trouble code. (Refer to GROUP 
13A − Troubleshooting 

P.13A-48

.)

Q: Is the DTC set?

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

STEP 3. Check whether the DTC is reset.
Q: Is DTC No. U0100 set?

YES : Replace the shift lever assembly. (Refer to 

P.22C-404

.)

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

to Cope with Intermittent Malfunction 

P.00-15

.)

DTC U0101: TC-SST Time-out 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.

.

JUDGMENT CRITERIA

The periodic communication data from TC-SST-ECU 
cannot be received.

.

PROBABLE CAUSES

• The CAN bus line is defective.
• Malfunction of TC-SST-ECU
• Malfunction of the shift lever-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using the scan tool, 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

.) After repairing the CAN 

bus line, go to Step 2.

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

P.22C-15

.)

Q: Is the DTC set?

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

STEP 3. Check whether the DTC is reset.
Q: Is DTC No. U0101 set?

YES : Replace the shift lever assembly. (Refer to 

P.22C-404

.)

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

to Cope with Intermittent Malfunction 

P.00-15

.)

DIAGNOSIS <SHIFT LEVER>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-375

DTC U0121: ASC Time-out 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.

.

JUDGMENT CRITERIA

The periodic communication data from the ASC-ECU 
cannot be received.

.

PROBABLE CAUSES

• The CAN bus line is defective.
• Malfunction of ASC-ECU
• Malfunction of the shift lever-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using the scan tool, 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

.) After repairing the CAN 

bus line, go to Step 2.

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. Check whether the DTC is reset.
Q: Is DTC No. U0121 set?

YES : Replace the shift lever assembly. (Refer to 

P.22C-404

.)

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

to Cope with Intermittent Malfunction 

P.00-15

.)

DTC U0141: ETACS Time-out 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.

.

JUDGMENT CRITERIA

The periodic communication data from the 
ETACS-ECU cannot be received.

.

PROBABLE CAUSES

• The CAN bus line is defective.
• Malfunction of the ETACS-ECU
• Malfunction of the shift lever-ECU

DIAGNOSIS <SHIFT LEVER>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-376

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using the scan tool, 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

.) After repairing the CAN 

bus line, go to Step 2.

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. Check whether the DTC is reset.
Q: Is DTC No. U0141 set?

YES : Replace the shift lever assembly. (Refer to 

P.22C-404

.)

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

to Cope with Intermittent Malfunction 

P.00-15

.)

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: The scan tool cannot communicate with the shift lever-ECU.

CAUTION

Whenever the ECU is replaced, ensure that the 
CAN bus lines are normal.

.

COMMENTS ON TROUBLE SYMPTOM

The CAN bus line, shift lever-ECU power supply cir-
cuit, or shift lever-ECU may have a problem.

.

PROBABLE CAUSES

• Wrong M.U.T.-III wiring harness
• The CAN bus line is defective.
• Malfunction of the shift lever-ECU power supply 

circuit

• Malfunction of the shift lever-ECU
• ECU malfunction of other system

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 : Check and repair the shift lever-ECU power supply 

circuit. (Refer to 

P.22C-387

.)

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

Troubleshooting 

P.54C-15

.)