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Diagnostic Item 20

DIAGNOSTIC ITEM 20: Failure in the lines between CAN main bus line and the ETACS-ECU.

CAUTION: When 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.









TROUBLE JUDGMENT
If the MUT-III cannot received signals from
ETACS-ECU, CAN bus line connector(s) are broken or an open circuit has occurred.

COMMENTS ON TROUBLE SYMPTOM
The wiring harness wire or connectors may have loose, corroded, or damage terminals, or terminals pushed back in the connector, or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- The wiring harness or connectors may have loose, corroded, or damage terminals, or terminals pushed back in the connector
- The ETACS-ECU may be defective

DIAGNOSIS

Required Special Tool:
- MB991223: Harness Set










STEP 1. Check joint connector (3) C-02 and ETACS-ECU connector C-18 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details Service Precautions/Vehicle Damage Warnings.

Check the joint connector at the wiring harness side for loose, corroded or damaged terminals, or terminals pushed back in the connector, and also check the short pin behind the connector for corrosion, deformation and delamination.

Q: Are joint connector (3) C-02 and ETACS-ECU connector C-18 in good condition?

YES: Go to Step 2.

NO: Repair the damaged parts. Replace the joint connector as necessary.

STEP 2. Check the CAN bus lines between joint connector (3) and the ETACS-ECU. Measure the resistance between joint connector (3) C-02 and ETACS-ECU connector C-18.

CAUTION: A digital multimeter should be used. For details Service Precautions/Vehicle Damage Warnings.

CAUTION: The test wiring harness should be used. For details Service Precautions/Vehicle Damage Warnings.







1. Disconnect joint connector (3) C-02 and ETACS-ECU connector C-18, and measure the resistances at the wiring harness sides of joint connector (3) C-02 and ETACS-ECU connector C-18.
2. Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION: Disconnect the negative battery terminal. For details Service Precautions/Vehicle Damage Warnings.

3. Disconnect the negative battery terminal.




4. Measure the resistance between joint connector (3) terminal 5 and ETACS-ECU connector terminal 72.

OK: 2 ohms or less




5. Measure the resistance between joint connector (3) terminal 16 and ETACS-ECU connector terminal 73.

OK: 2 ohms or less

CAUTION: Strictly observe the specified wiring harness repair procedure. For details Service Precautions/Vehicle Damage Warnings.

Q: Do all the resistances measure 2 ohms or less?

YES: If all the resistances measure 2 ohms or less, power supply to the ETACS-ECU may be suspected. Diagnose the SWS. Refer to "Inspection Procedure A-3: Communication with the ETACS-ECU is not Possible".

NO: If either of the resistances measures more than 2 ohms or all the resistances measure more than 2 ohms, repair the wiring harness between joint connector (3) and the ETACS-ECU connector.
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