Diagnostic Item 8
DIAGNOSTIC ITEM 8: Diagnose When The Scan Tool Cannot Receive The Data Sent By TCM.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 Communication Circuit (Part 1):
CAN Communication Circuit (Part 2):
FUNCTION
If the scan tool MB991958 cannot communicate with the TCM, this diagnosis result will be set.
TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the TCM, the ETACS-ECU determines that there is a failure.
TROUBLESHOOTING HINTS
- Malfunction of the connector [joint connector (CAN3) or TCM connector improperly connected]
- Malfunction of the wiring harness [open circuit between the TCM and the joint connector (CAN3), power supply circuit to the TCM]
- Malfunction of the TCM
DIAGNOSIS
Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
STEP 1. Check joint connector (CAN3) C-01 and TCM connector C-38 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-01 and TCM connector C-38 in good condition?
YES : Go to Step 2.
NO : Repair the damaged parts.
STEP 2. Check the wiring harness between joint connector (CAN3) C-01 and TCM connector C-38.
CAUTION: Strictly observe the specified wiring harness repair procedure.
1. Disconnect joint connector (CAN3) C-01 and TCM connector C-38, and check the wiring harness.
2. Check the wiring harness between joint connector (CAN3) C-01 (terminal No.7) and TCM connector C-38 (terminal No.4)
3. Check the wiring harness between joint connector (CAN3) C-01 (terminal No.20) and TCM connector C-38 (terminal No.5)
4. Check the wiring harness between joint connector (CAN3) C-01 (terminal No.7) and TCM connector C-38 (terminal No. 10)
5. Check the wiring harness between joint connector (CAN3) C-01 (terminal No.20) and TCM connector C-38 (terminal No.11)
Q: Is the wiring harness between joint connector (CAN3) C-01 and TCM connector C-38 in good condition?
YES : Check the power supply circuit of the TCM. Refer to Continuously variable transaxle Troubleshooting
NO : Repair the wiring harness between joint connector (CAN3) C-01 and TCM connector C-38.