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DIAGNOSTIC ITEM 6: Diagnose when the scan tool cannot receive the data sent by ETACS-ECU.
 
 
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
The diagnostic result demonstrates that "the scan tool cannot receive the data sent by ETACS-ECU" when the scan tool MB991958 checks the periodically sent data from each ECU and cannot receive the ETACS-ECU data only.
 
 
TROUBLE JUDGMENT CONDITIONS
The scan tool MB991958 judges the trouble when the periodically sent data from ETACS-ECU cannot be received.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the connector [joint connector (CAN2) or ETACS-ECU connector improperly connected]
  • Malfunction of the wiring harness [open circuit between the ETACS-ECU and the joint connector (CAN2), power supply circuit to the ETACS-ECU]
  • Malfunction of the ETACS-ECU
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Check joint connector (CAN2) C-202 and ETACS-ECU connector C-411 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 and ETACS-ECU connector C-411 in good condition?
Go to Step 2.
Repair the damaged parts.
 
STEP 2. Check the wiring harness between joint connector (CAN2) C-202 and ETACS-ECU connector C-411 for open circuit.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
(1) Disconnect joint connector (CAN2) C-202 and ETACS-ECU connector C-411, and check the wiring harness.
(2) Check the wiring harness between joint connector (CAN2) C-202 (terminal No.11) and ETACS-ECU connector C-411 (terminal No.9)
OK: Continuity exists (2 ohms or less)
(3) Check the wiring harness between joint connector (CAN2) C-202 (terminal No.22) and ETACS-ECU connector C-411 (terminal No.8)
OK: Continuity exists (2 ohms or less)
Is the wiring harness between joint connector (CAN2) C-202 and ETACS-ECU connector C-411 in good condition?
Check the power supply circuit of the ETACS-ECU. Refer to GROUP 54A, ETACS, Diagnosis.
Repair the wiring harness between joint connector (CAN2) C-202 and ETACS-ECU connector C-411.