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DIAGNOSTIC ITEM 8: Diagnose when the scan tool cannot receive the data sent by TCM <CVT>.
 
 
cautionWhen 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.
 
 
 
 
FUNCTION
If the scan tool MB991958 cannot communicate with the TCM, this diagnosis result will be set.
 
 
TROUBLE JUDGMENT 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-24 and TCM connector C-131 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
cautionThe strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to .
Are joint connector (CAN3) C-24 and TCM connector C-131 in good condition?
Go to Step 2.
Repair the damaged parts.
 
STEP 2. Check the wiring harness between joint connector (CAN3) C-24 and TCM connector C-131 for open circuit.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
(1) Disconnect joint connector (CAN3) C-01 and TCM connector C-131, and check the wiring harness.
(2) Check the wiring harness between joint connector (CAN3) C-24 (terminal No.5) and TCM connector C-131 (terminal No.9 <2.0L ENGINE> or No.4 <2.4L ENGINE>)
OK: Continuity exists (2 ohms or less)
(3) Check the wiring harness between joint connector (CAN3) C-24 (terminal No.16) and TCM connector C-131 (terminal No.10 <2.0L ENGINE> or No.5 <2.4L ENGINE>)
OK: Continuity exists (2 ohms or less)
Is the wiring harness between joint connector (CAN3) C-01 and TCM connector C-38 in good condition?
Check the power supply circuit of the TCM. Refer to GROUP 23A, Troubleshooting <2.0L ENGINE> or GROUP 23C, Troubleshooting <2.4L ENGINE>.
Repair the wiring harness between joint connector (CAN3) C-24 and TCM connector C-131.