Inspection Procedure 4: Abnormally of the WCM power supply and earth circuits.


COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Damaged wiring harness and connectors
  • Malfunction of WCM

DIAGNOSIS PROCEDURE


STEP 1. Connector check: C-09 WCM connector


Q. Is the check result normal?





STEP 2. Voltage measurement at the C-09 WCM connector.


(1)Disconnect the connector and measure the resistance at the wiring harness side.
(2)Turn the ignition switch to the ON position.
(3)Measure the voltage between the C-09 WCM connector terminals No. 7, 8 and the body earth.
OK: System voltage

Q. Is the check result normal?





STEP 3. Check the wiring harnesses between the C-09 WCM connector terminal No. 7, 8 and the fusible link 34 <4A9, 4B1> or 44 <4N1>, 36 <4A9, 4B1> or 38 <4N1>.



  • Check the power supply line for open circuit.
note Before checking the wiring harnesses, check the C-406, C-408 and C-417 ETACS-ECU connectors, C-04 joint connector (2), and repair if necessary.

Q. Is the check result normal?





STEP 4. Resistance measurement at the C-09 WCM connector.


(1)Disconnect the connector and measure the resistance at the wiring harness side.
(2)Turn the ignition switch to the ON position.
(3)Measure the resistance between the C-09 WCM connector terminal No. 4 and the body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?





STEP 5. Check the wiring harness between the C-09 WCM connector terminal No. 4 and the body earth.



  • Check the earth wires for open circuit.
note Before checking the wiring harnesses, check the C-01 earth joint connector, C-108 joint connector (4), and repair if necessary.

Q. Is the check result normal?