Diagnostic Item 14

DIAGNOSTIC ITEM 14: Diagnose The Lines Between Joint Connector (CAN3) And Joint Connector (CAN4). [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 a failure is present in the wiring harness between the joint connector (CAN3) and the joint connector (CAN4), this diagnosis result will be set.

TROUBLE JUDGMENT CONDITIONS
If a communication flag is not set for some of the ECUs on the CAN-C line, the ETACS-ECU determines that there is a failure.

TROUBLESHOOTING HINTS
- Malfunction of the connector [joint connector (CAN3), joint connector (CAN4) or intermediate connector failed]
- Malfunction of the wiring harness [open circuit between joint connector (CAN3) and joint connector (CAN4)]

DIAGNOSIS

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

STEP 1. Check joint connector (CAN3) C-127, joint connector (CAN4) A-14 and intermediate connector A-13 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 (CAN3) C-127, joint connector (CAN4) A-14 and intermediate connector A-13 in good condition?

YES : Go to Step 2.

NO : Repair the damaged parts.

STEP 2. Check the wiring harness between joint connector (CAN3) C-127 and joint connector (CAN4) A-14 for open circuit.

CAUTION: Strictly observe the specified wiring harness repair procedure.

1. Disconnect joint connector (CAN3) C-127 and joint connector (CAN4) A-14, and check the wiring harness







2. Check the wiring harness between joint connector (CAN3) C-127 (terminal 3) and joint connector (CAN4) A-14 (terminal 5)

OK: Continuity exists (2 ohms or less)







3. Check the wiring harness between joint connector (CAN3) C-127 (terminal 14) and joint connector (CAN4) A-14 (terminal 16)

OK: Continuity exists (2 ohms or less)

Q: Is the wiring harness between joint connector (CAN3) C-127 and joint connector (CAN4) A-14 in good condition?

YES : The trouble can be an intermittent malfunction.

NO : Repair the wiring harness between joint connector (CAN3) C-127 and joint connector (CAN4) A-14.