Inspection Procedure 2: Malfunction of the ignition switch power supply system


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM



POSSIBLE CAUSES



  • Malfunction of the ignition switch
  • Malfunction of the fuse No.14
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. Connector check: C-309 ignition switch connector


Q. Is the check result normal?





STEP 2. Voltage measurement at C-309 ignition switch connector in order to check the battery circuit of power supply system to the ignition switch.


(1)Disconnect the C-309 ignition switch connector and measure the voltage at C-309 ignition switch connector harness side.
(2)Measure the voltage between terminal 1 and earth.
OK: System voltage

Q. Is the check result normal?





STEP 3. Check the fuse No.14.


Q. Is the check result normal?





STEP 4. Connector check: C-408 ETACS-ECU connector


Q. Is the check result normal?





STEP 5. Check the wiring harness from C-309 ignition switch connector terminal No.1 and C-408 ETACS-ECU connector terminal No.3



  • Check the battery power supply line for open circuit.
note Before the wiring harness check, check the joint connector C-231, and repair them if necessary.

Q. Is the check result normal?





STEP 6. Check the ignition switch.



Q. Is the ignition switch in good condition?





STEP 7. Retest the system.


Q. Do the device and the system work normally when the ignition switch is operated?