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DIAGNOSTIC ITEM 20: Diagnose the ETACS-ECU, joint connector (CAN1) or lines between ETACS-ECU and joint connector (CAN1).
 
 
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 a failure is present in the wiring harness wires between the ETACS-ECU connector, the joint connector (CAN1), the ETACS-ECU connector and the joint connector (CAN1), this diagnosis result will be set.
 
 
TROUBLE JUDGMENT CONDITIONS
If a communication flag is set for none of the ECUs on the CAN-B line, the ETACS-ECU determines that there is a failure.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the connector [joint connector (CAN1) or ETACS-ECU connector improperly connected]
  • Malfunction of the wiring harness [open circuit between the ETACS-ECU connector and the joint connector (CAN1)]
  • Malfunction of the ETACS-ECU
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Check joint connector (CAN1) C-05 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 (CAN1) C-05 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 (CAN1) C-05 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 (CAN1) C-05 and ETACS-ECU connector C-411, and check the wiring harness.
(2) Check the wiring harness between joint connector (CAN1) C-05 (terminal 11) and ETACS-ECU connector C-411 (terminal 6)
OK: Continuity exists (2 ohms or less)
(3) Check the wiring harness between joint connector (CAN1) C-05 (terminal 22) and ETACS-ECU connector C-411 (terminal 7)
OK: Continuity exists (2 ohms or less)
Is the wiring harness between joint connector (CAN1) C-05 and ETACS-ECU connector C-411 in good condition?
Go to Step 3.
Repair the wiring harness between joint connector (CAN1) C-05 and ETACS-ECU connector C-411.
 
STEP 3. Using scan tool MB991958, diagnose the CAN bus line. (trouble symptom check)
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
(1) Read all diagnosis with scan tool MB991958.
(2) Confirm that all diagnosis reading results are as shown in the table.
Are all diagnosis reading results as shown in the table?
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.