Mitsubishi Lancer Evolution X. Manual - part 596

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-341

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

AC902075AB

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-342

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

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

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.

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

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-343

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.

STEP 4. Check the wiring harness between B-107 
TC-SST-ECU connector terminal No. 19 and body ground.
Check the ground line for open circuit.
Q: Is the check result normal?

YES : Go to Step 5.
NO :  Repair the wiring harness.

STEP 5. Measure the voltage at B-107 TC-SST-ECU 
connector.
Disconnect the connector, and measure the voltage between 
terminal No. 6 and ground at the wiring harness side.

OK: Battery positive voltage

Q: Is the check result normal?

YES : Go to Step 8.
NO :  Go to Step 6.

STEP 6. Inspection of the intermediate connector and 
TC-SST-ECU connector: A-13, B-107
Check for the contact with terminals.
Q: Is the check result normal?

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

STEP 7. Check the wiring harness between B-107 
TC-SST-ECU connector terminal No. 6 and fusible link No. 
36.
Check the power supply line for short or open circuit.
Q: Is the check result normal?

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

STEP 8. 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 9.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-344

STEP 9. Measure the voltage at B-107 TC-SST-ECU 
connector.
(1) Disconnect the connector, and measure the voltage 

between terminal No. 11 and ground at the wiring harness 
side.

(2) Turn the ignition switch to the "ON" position.

OK: Battery positive voltage

Q: Is the check result normal?

YES : Go to Step 12.
NO :  Go to Step 10.

STEP 10. Inspection of the intermediate connector, 
TC-SST-ECU connector, and ETACS-ECU connector: A-13, 
C-131, B-107, C-317
Check for the contact with terminals.
Q: Is the check result normal?

YES : Go to Step 11.
NO :  Repair the defective connector.

STEP 11. Check the wiring harness between B-107 
TC-SST-ECU connector terminal No. 11 and C-317 
ETACS-ECU connector terminal No. 5.
Check the power supply line for short or open circuit.
Q: Is the check result normal?

YES : Go to Step 12.
NO :  Repair the wiring harness.

STEP 12. Retest the system.
Q: Does a malfunction take place again?

YES : Replace the mechatronic assembly. (Refer to 

P.22C-421

.)

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

to Cope with Intermittent Malfunction 

P.00-15

.)