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DIAGNOSTIC ITEM 6: Diagnose when the scan tool cannot receive the data sent by AWD-ECU <AWD>.
 
 
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 AWD-ECU, this diagnosis result will be set.
 
 
TROUBLE JUDGMENT CONDITIONS
If a communication flag is not set for the AWD-ECU, the ETACS-ECU determines that there is a failure.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the connector [joint connector (CAN2) or AWD-ECU connector improperly connected]
  • Malfunction of the wiring harness [open circuit between the AWD-ECU and the joint connector (CAN2), power supply circuit to the AWD-ECU]
  • Malfunction of the AWD-ECU
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Check joint connector (CAN2) C-202, AWD-ECU connector C-228, intermediate connector C-27 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 (CAN2) C-202, AWD-ECU connector C-228, intermediate connector C-27in good condition?
Go to Step 2.
Repair the damaged parts.
 
STEP 2. Check the wiring harness between joint connector (CAN2) C-202 and AWD-ECU connector C-228 for open circuit.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
(1) Disconnect joint connector (CAN2) C-202 and AWD-ECU connector C-228, and check the wiring harness.
(2) Check the wiring harness between joint connector (CAN2) C-202 (terminal No.8) and AWD-ECU connector C-228 (terminal No.5)
OK: Continuity exists (2 ohms or less)
(3) Check the wiring harness between joint connector (CAN2) C-202 (terminal No.19) and AWD-ECU connector C-228 (terminal No.13)
OK: Continuity exists (2 ohms or less)
Is the wiring harness between joint connector (CAN2) C-202 and AWD-ECU connector C-228 in good condition?
Check the power supply circuit of the AWD-ECU. Refer to GROUP 27C, Multiselect AWD Diagnosis .
Repair the wiring harness between joint connector (CAN2) C-202 and AWD-ECU connector C-228.