Mitsubishi Evolution X. Manual - part 459

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-293

PROBABLE CAUSES

• Malfunction of the paddle shift 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.

STEP 2. PADDLE SHIFT SWITCH CHECK
Refer to 

P.22C-348

.

Q: Is the check result normal?

YES : Go to Step 3.
NO :  Replace the paddle shift assembly. (Refer to 

P.22C-348

.)

STEP 3. Measure the resistance at C-207 paddle shift 
switch connector.
Disconnect the connector, and measure the resistance 
between terminal No.2 and ground at the wiring harness side.

OK: Continuity exists. (2 

Ω or less)

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Go to Step 4.

STEP 4. Paddle shift switch connector check: C-207
Check for the contact with terminals.
Q: Is the check result normal?

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

STEP 5. Check the wiring harness between C-207 paddle 
shift switch connector terminal No. 2 and the body ground.
Check the ground line for open circuit.
Q: Is the check result normal?

YES : Go to Step 6.
NO :  Repair the wiring harness.

STEP 6. Inspection of the shift lever assembly connector, 
intermediate connector, and paddle shift switch connector: 
C-27, C-130, C-207
Check for the contact with terminals.
Q: Is the check result normal?

YES : Go to Step 7.
NO :  Repair the defective connector.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-294

STEP 7. Check the wiring harness between C-207 paddle 
shift switch connector terminal No. 1 and C-27 shift lever 
assembly connector terminal No. 11, and between C-207 
paddle shift switch connector terminal No. 3 and C-27 shift 
lever assembly connector terminal No. 10.
Check the output line for short or open circuit.
Q: Is the check result normal?

YES : Go to Step 8.
NO :  Repair the wiring harness.

STEP 8. 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>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-295

INSPECTION PROCEDURE 4: TC-SST-ECU power supply circuit malfunction

ETACS-ECU

IG1
RELAY

ENGINE 
COMPARTMENT

RELAY
BOX

FUSIBLE 
LINK

34

FUSIBLE 
LINK

36

TRANSAXLE 
ASSEMBLY

IGNITION
SWITCH (IG1)

NOTE

: THE TERMINAL NUMBERS DESCRIBED 

IN THE CIRCUIT DIAGRAM AGREE WITH 
THE NUMBERS MARKED ON THE 
TRANSAXLE ASSEMBLY CONNECTOR AND 
HARNESS SIDE CONNECTOR.

Power supply system circuit

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-296

CAUTION

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

.

COMMENTS ON TROUBLE SYMPTOM

TC-SST-ECU power supply circuit, ground circuit, or 
TC-SST-ECU may have a problem.

.

PROBABLE CAUSES

• Defective battery

• Damaged harness wires and connectors

• Malfunction of the ETACS-ECU

• Malfunction of the shift lever-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Check the battery.
Refer to GROUP 54A 

− Battery Test 

P.54A-9

.

Q: Is the battery in good condition?

YES : Go to Step 2.
NO :  Charge or replace the battery.

STEP 2. Measure the resistance at B-107 TC-SST-ECU 
connector.
Disconnect the connector, and measure the resistance 
between terminal No. 19 and ground at the wiring harness side.

OK: Continuity exists. (2 

Ω or less)

Q: Is the check result normal?

YES : Go to Step 5.
NO  :  Go to Step 3.

STEP 3. TC-SST-ECU connector check: B-107
Check for the contact with terminals.
Q: Is the check result normal?

YES : Go to Step 4.
NO :  Repair the defective connector.

AC708949AO

Connector: A-13

AC709137

Connector: B-107

AD

B-107 (B)

AC708950

Connector: C-131

CN

AC708972BI

Connectors: C-309, C-317

C-309 (B)

C-317

ETACS-ECU