Inspection Procedure 6: Starting Impossible (starter operative but no initial combustion)


COMMENTS ON TROUBLE SYMPTOM



  • The failure could possibly be caused by the failed ignition circuit, defective fuel feed and so on.

PROBABLE CAUSES



  • Failed battery
  • Timing chain broken
  • Contamination around the throttle valve
  • Failed ignition system
  • Failed fuel system
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check battery.

  • Check battery (Refer to GROUP 54A - Battery - On-vehicle Service - Battery Test ).

Q. Is the check result normal?
Go to Step 2.
Replace the battery.

STEP 2. M.U.T.-III diagnosis code

Q. Is diagnosis code set?
Inspection chart for diagnosis code (Refer to ).
Go to Step 3.

STEP 3. M.U.T.-III actuator test

  • Item 9: Fuel pump
OK: Operating sound of fuel pump can be heard

Q. Is the check result normal?
Go to Step 4.
Check Inspection Procedure - fuel pump system (Refer to ).

STEP 4. Check timing chain for breakage.

  • Engine: Cranking
OK: Camshaft rotates

Q. Is the check result normal?
Go to Step 5.
Replace the timing chain.

STEP 5. Check throttle body (throttle valve portion) contamination.

Q. Is the check result normal?
Go to Step 6.
Throttle body (throttle valve area) cleaning (Refer to ).

STEP 6. M.U.T.-III data list

  • Data list reference table (Refer to ).

  1. Item 2: Crank angle sensor

Q. Is the check result normal?
Go to Step 7.
Check code No. P0335: crank angle sensor system (Refer to ).

STEP 7. Visual check of ignition spark.

  • Remove the spark plug and install it to the ignition coil.
  • Connect the ignition coil connector.
  • Disconnect all injector connectors.
  • At the engine start, check each spark plug produces a spark.

Q. Is the check result normal?
Go to Step 8.
Check Inspection Procedure - ignition circuit system (Refer to ).

STEP 8. Connector check: A-70X injector relay connector

Q. Is the check result normal?
Go to Step 9.
Repair or replace the connector.

STEP 9. Check injector relay itself.

  • Injector relay continuity check (Refer to ).

Q. Is the check result normal?
Go to Step 10.
Replace the injector relay.

STEP 10. Perform resistance measurement at A-70X injector relay connector.

  • Remove relay, and measure at relay box side.
  • Resistance between terminal No. 2 and earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?
Go to Step 11.

    Check and repair harness between A-70X (terminal No. 2) injector relay connector and body earth.

    • Check earthing line for open circuit and damage.

STEP 11. Perform voltage measurement at A-70X injector relay connector.

  • Remove relay, and measure at relay box side.
  • Ignition switch: ON
  • 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: C-403 ETACS-ECU connector

Q. Is the check result normal?

    Check and repair harness between C-403 (terminal No. 10) ETACS-ECU connector and A-70X (terminal No. 1) injector relay connector.

    • Check power supply line for open/short circuit.
Repair or replace the connector.

STEP 13. Perform voltage measurement at A-70X injector relay connector.

  • Remove relay, and measure at relay box side.
  • Ignition switch: ON
  • Voltage between terminal No. 4 and earth.
OK: System voltage

Q. Is the check result normal?
Go to Step 15.
Go to Step 14.

STEP 14. Connector check: A-37X engine control relay connector

Q. Is the check result normal?

    Check and repair harness between A-37X (terminal No. 2) engine control relay connector and A-70X (terminal No. 4) injector relay connector.

    • Check power supply line for open/short circuit.
Repair or replace the connector.

STEP 15. Perform voltage measurement at B-101, B-102, B-105 and B-106 injector connectors.

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

Q. Are the check results normal?
Go to Step 18.
Go to Step 16.

STEP 16. Check harness between A-70X (terminal No. 3) injector relay connector and B-101, B-102, B-105 and B-106 (terminal No. 1) injector connectors.
note Before checking harness, check intermediate connector A-17, and repair if necessary.

  • Check power supply line for open/short circuit.

Q. Is the check result normal?
Go to Step 17.
Repair the damaged harness wire.

STEP 17. Connector check: C-403 ETACS-ECU connector

Q. Is the check result normal?

    Check and repair harness between C-403 (terminal No. 10) ETACS-ECU connector and A-70X (terminal No. 1) injector relay connector.

    • Check power supply line for damage.
Repair or replace the connector.

STEP 18. Connector check: A-37X engine control relay connector

Q. Is the check result normal?
Go to Step 19.
Repair or replace the connector.

STEP 19. Check harness between A-37X (terminal No. 2) engine control relay connector and A-70X (terminal No. 4) injector relay connector.

  • Check power supply line for damage.

Q. Is the check result normal?
Go to Step 20.
Repair the damaged harness wire.

STEP 20. Check harness between A-70X (terminal No. 3) injector relay connector and B-101, B-102, B-105 and B-106 (terminal No. 1) injector connectors.
note Before checking harness, check intermediate connector A-17, and repair if necessary.

  • Check power supply line for damage.

Q. Is the check result normal?
Go to Step 21.
Repair the damaged harness wire.

STEP 21. Check injector for operating sound.

  • Injector check (Refer to ).

Q. Is operating sound audible?
Go to Step 22.
Check the injector system of the defective cylinder. Check code No. P0201: No. 1 injector system (Refer to ). Check code No. P0202: No. 2 injector system (Refer to ). Check code No. P0203: No. 3 injector system (Refer to ). Check code No. P0204: No. 4 injector system (Refer to ).

STEP 22. Fuel pressure measurement.

  • Fuel pressure test (Refer to ).

Q. Is the check result normal?
Go to Step 23.
Repair.

STEP 23. Replace the engine-ECU.

  • After replacing the engine-ECU re-check the trouble symptoms.

Q. Does the trouble symptom persist?
Check for foreign matters (water, diesel fuel, etc.) in fuel and replace if necessary.
Check end.