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








COMMENT 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 the diagnosis code set?
Inspection chart for diagnosis codes (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 fuel pump system (Refer to Inspection Procedure 21 )

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 .
Clean throttle body (throttle valve portion) (Refer to ).

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

  • Refer to Data List Reference Table .

  1. Item 2: Crank angle sensor

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

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 ignition circuit system (Refer to Inspection Procedure 23 )

STEP 8. Connector check: A-23X injector relay connector

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

STEP 9. Check injector relay itself.

  • Check injector relay itself (Refer to ).

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

STEP 10. Perform resistance measurement at A-23X 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-23X (terminal No. 2) injector relay connector and body earth.

    • Check earthing line for open circuit and damage.

STEP 11. Perform voltage measurement at A-23X 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-304 ETACS-ECU connector

Q. Is the check result normal?

    Check and repair harness between C-304 (terminal No. 10) ETACS-ECU connector and A-23X (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-23X 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-33X engine control relay connector

Q. Is the check result normal?

    Check and repair harness between A-33X (terminal No. 2) engine control relay connector and A-23X (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-103 and B-104 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-23X (terminal No. 3) injector relay connector and B-101, B-102, B-103 and B-104 (terminal No. 1) injector connectors.
note Before checking harness, check intermediate connector A-11, 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-304 ETACS-ECU connector

Q. Is the check result normal?

    Check and repair harness between C-304 (terminal No. 10) ETACS-ECU connector and A-23X (terminal No. 1) injector relay connector.

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

STEP 18. Connector check: A-33X 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-33X (terminal No. 2) engine control relay connector and A-23X (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-23X (terminal No. 3) injector relay connector and B-101, B-102, B-103 and B-104 (terminal No. 1) injector connectors.
note Before checking harness, check intermediate connector A-11, 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.

  • Check injector for operating sound at engine cranking (Refer to ).

Q. Can operating sound be heard?

Go to Step 22 .

    Check the injector system of the defective cylinder.
    (Refer to Code No. P0201: No. 1 injector system ).
    (Refer to Code No. P0202: No. 2 injector system ).
    (Refer to Code No. P0203: No. 3 injector system ).
    (Refer to Code No. P0204: No. 4 injector system ).

STEP 22. Fuel pressure measurement.

  • Fuel pressure measurement (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 trouble symptom persist?

Check for foreign matters (water, diesel fuel, etc.) in fuel and replace if necessary.
Check end.