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DIAGNOSTIC ITEM 12: Diagnose the lines between the ETACS-ECU and joint connector (CAN2).
 
 
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 between the ETACS-ECU connector and the joint connector (CAN2), this diagnosis result will be set.
 
 
TROUBLE JUDGMENT CONDITIONS
If a communication flag is not set for some of the ECUs on the CAN-C line, the ETACS-ECU determines that there is a failure.
 
 
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 connector and the joint connector (CAN2), power supply circuit to the engine control module]
  • 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?
Go to Step 3.
Repair the wiring harness between joint connector (CAN2) C-202 and ETACS-ECU connector C-411.
 
STEP 3. Using scan tool MB991958, diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Connect scan tool MB991958 to the data link connector. Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose CAN bus lines, and check if the scan tool screen is as shown in the illustration.
Does the scan tool screen correspond to the illustration?
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.