Inspection Procedure 4: Starting Impossible (No Initial Combustion)




COMMENT ON TROUBLE SYMPTOM



PROBABLE CAUSE



DIAGNOSIS PROCEDURE

STEP 1. Check battery voltage.

  • Measure battery voltage at cranking.
OK: 8 V or more

Q. Is the check result normal?
Go to Step 2 .
Check battery (Refer to GROUP 54A - Battery - On-vehicle Service - Battery Test ).

STEP 2. M.U.T.-III data list

  • Item 18: Cranking signal
OK:
    ON (Ignition switch: ST)
    OFF (Ignition switch: ON)

Q. Is the check result normal?
Go to Step 10 .
Go to Step 3 .

STEP 3. Connector check: B-111 inhibitor switch connector

Q. Is the check result normal?

Go to Step 4 .

Repair or replace.

STEP 4. Perform voltage measurement at B-111 inhibitor switch connector


  • Disconnect connector, and measure at the harness side.
  • Ignition switch: ST
  • Voltage between terminal No. 10 and earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 7 .

Go to Step 5 .

STEP 5. Connector check: C-307 ignition switch connector

Q. Is the check result normal?

Go to Step 6 .

Repair or replace.

STEP 6. Check ignition switch



  • Check ignition switch (Refer to GROUP 54A - Ignition switch - Ignition Switch - Inspection ).

Q. Is the check result normal?


    Check intermediate connector C-18 and repair if necessary. If intermediate connector is normal, check and repair harness between B-111 (terminal No. 10) inhibitor switch connector and C-307 (terminal No. 5) ignition switch connector.

    • Check power supply line for open/short circuit.

Replace ignition switch.

STEP 7. Check inhibitor switch itself.

  • Check inhibitor switch itself (Refer to GROUP 23A - On - vehicle Service - A/T Control Component Check - Inhibitor Switch Check ).

Q. Is the check result normal?
Go to Step 8 .
Replace inhibitor switch.

STEP 8. Connector check: B-116 starter connector

Q. Is the check result normal?

Go to Step 9 .

Repair or replace.

STEP 9. Check harness between B-111 (terminal No. 9) inhibitor switch connector and B-116 (terminal No. 1) starter connector


note Before checking harness, check intermediate connectors B-17 and repair if necessary.

  • Check output line for short circuit.

Q. Is the check result normal?


    Check and repair harness between B-111 (terminal No.9) inhibitor switch connector and C-111 (terminal No. 51) engine-A/T-ECU connector.

    • Check output line for short circuit.

Repair.

STEP 10. Check connector: B-116 starter connector

Q. Is the check result normal?

Go to Step 11 .

Repair or replace.

STEP 11. Perform voltage measurement at B-116 starter connector.


  • Disconnect connector, and measure at the harness side.
  • Ignition switch: ST
  • Voltage between terminal No. 1 and earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 13 .

Go to Step 12 .

STEP 12. Connector check: B-111 inhibitor switch connector


Q. Is the check result normal?


    Check intermediate connectors B-17, and repair if necessary. If intermediate connectors are normal, check and repair harness between B-111 (terminal No. 9) inhibitor switch connector and B-116 (terminal No. 1) starter connector.

    • Check output line for open circuit and damage.

Repair or replace.

STEP 13. Connector check: B-115 starter connector

Q. Is the check result normal?


    Go to Step 14 .

Repair or replace.

STEP 14. Perform voltage measurement at B-115 starter connector.


  • Disconnect connector, and measure at the harness side.
  • Voltage between terminal No. 1 and earth.
OK: System voltage

Q. Is the check result normal?


    Go to Step 15 .


    Check and repair harness between B-115 (terminal No. 1) starter connector and battery.

    • Check power supply line for open/short circuit.

STEP 15. Check harness between B-111 (terminal No. 9) inhibitor switch connector and B-116 (terminal No. 1) starter connector.


note Before checking harness, check intermediate connectors B-17 and repair if necessary.

  • Check output line for damage.

Q. Is the check result normal?

Go to Step 16 .

Repair.

STEP 16. Check harness between B-115 (terminal No. 1) starter connector and battery.


  • Check power supply line for damage.

Q. Is the check result normal?

Replace starter.

Repair.