Mitsubishi Evolution X. Manual - part 458

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-289

STEP 3. Check whether the DTC is reset.
Q: Is DTC No. U0141 set?

YES : Replace the TC-SST assembly. (Refer to 

P.22C-341

.)

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 TC-SST-ECU.

CAUTION

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

.

COMMENTS ON TROUBLE SYMPTOM

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

.

PROBABLE CAUSES

• Wrong M.U.T.-III wiring harness

• The CAN bus line is defective.

• Malfunction of TC-SST-ECU power supply circuit

• Malfunction of TC-SST-ECU

• ECU malfunction of other system

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 TC-SST-ECU power supply 

circuit. (Refer to 

P.22C-295

.)

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

− 

Troubleshooting 

P.54C-14

.)

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-290

INSPECTION PROCEDURE 2: The driving mode cannot be changed.

CAUTION

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

.

COMMENTS ON TROUBLE SYMPTOM

The twin clutch SST control mode switch, or 
TC-SST-ECU may have a problem.

.

PROBABLE CAUSES

• Malfunction of the twin clutch SST control mode 

switch

• Damaged harness wires and connectors

• Malfunction of the shift lever-ECU

• Malfunction of TC-SST-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

.) After repairing the CAN 

bus line, go to Step 2.

CPU

SHIFT LEVER

TWIN CLUTCH 
SPORT SHIFT 
TRANSAXLE 
CONTROL 
MODE SWITCH

Twin clutch sport shift transaxle control mode switch circuit

AC705170AL

Connector: C-27-2

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-291

STEP 2. Scan tool service data
Item No. 30: Drive mode switch (Refer to Service Data Refer-
ence Table 

P.22C-298

.)

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 3.

STEP 3. Twin clutch SST control mode switch check
Refer to 

P.22C-349

.

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Replace the twin clutch SST control mode switch. 

(Refer to 

P.22C-349

.)

STEP 4. Twin clutch SST control mode switch connector 
check: C-27-2
Check for the contact with terminals.
Q: Is the check result normal?

YES : Go to Step 5.
NO :  Repair the defective connector.

STEP 5. Trouble symptom recheck after replacing the shift 
lever assembly
(1) Replace the shift lever assembly. (Refer to 

P.22C-334

.)

(2) Verify that the condition described by the customer exists.
Q: Does a malfunction take place again?

YES : Replace the TC-SST assembly. (Refer to 

P.22C-341

.)

NO :  Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

.)

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-292

INSPECTION PROCEDURE 3: Speed change with the paddle shift is impossible.

CAUTION

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

.

COMMENTS ON TROUBLE SYMPTOM

The paddle shift switch, or TC-SST-ECU may have a 
problem.

.

CPU

SHIFT LEVER

PADDLE 
SHIFT 
SWITCH

Paddle shift switch system circuit

AC705170AM

Connector: C-27

AC708950

Connector: C-130

CM

C-130 (BR)

AC708953AK

Connector: C-207