Diagnostic Item 11

DIAGNOSTIC ITEM 11: Diagnose When The Scan Tool Cannot Receive The Data Sent By TC-SST-ECU. [TC-SST]

CAUTION: When servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted water pipe. If you fail to do so, a component connected to the CAN bus line may be damaged.

CAN-C Communication Circuit <TC-SST> (Part 1):

CAN-C Communication Circuit <TC-SST> (Part 2):

FUNCTION
If the scan tool MB991958 cannot communicate with the TC-SST-ECU, this diagnosis result will be set.

TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the TC-SST-ECU, the ETACS-ECU determines that there is a failure.

TROUBLESHOOTING HINTS
- Malfunction of the connector [joint connector (CAN4), transaxle assembly connector improperly connected]
- Malfunction of the wiring harness [open circuit between the transaxle assembly connector and the joint connector (CAN4), power supply circuit to the transaxle assembly]
- Malfunction of the TC-SST-ECU

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN4) A-14 and transaxle assembly connector B-107 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector.

Q : Are joint connector (CAN4) A-14 and transaxle assembly connector B-107 in good condition?

YES : Go to Step 2.

NO : Repair the damaged parts.

STEP 2. Check the wiring harness between joint connector (CAN4) A-14 and transaxle assembly connector B-107 for open circuit.

CAUTION: Strictly observe the specified wiring harness repair procedure.

1. Disconnect joint connector (CAN4) A-14 and transaxle assembly B-107, and check the wiring harness.




2. Check the wiring harness between joint connector (CAN4) A-14 (terminal 6) and transaxle assembly connector B-107 (terminal 5)

OK: Continuity exists (2 ohms or less)




3. Check the wiring harness between joint connector (CAN4) A-14 (terminal 19) and transaxle assembly connector B-107 (terminal 2)

OK: Continuity exists (2 ohms or less)

Q : Is the wiring harness between joint connector (CAN4) A-14 and transaxle assembly connector B-107 in good condition?

YES : Check the power supply circuit of the transaxle assembly. Refer to Twin Clutch -Sportronic Shift Transmission (TC - SST), TC-SST Diagnosis.

NO : Repair the wiring harness between joint connector (CAN4) A-14 and transaxle assembly connector B-107.