Inspection Procedure 6: Starting Impossible (initial combustion but no complete combustion), Improper Starting (long time to start)


COMMENTS ON TROUBLE SYMPTOM



  • The failure could possibly be caused by the poor ignition, improper air-fuel ratio at cranking, failed fuel pressure and so on.

PROBABLE CAUSES



  • Failed battery
  • Failed ignition system
  • Failed fuel system
  • Failed air-fuel ratio control system
  • Failed intake air system
  • Contamination around the throttle valve
  • Timing chain in out of place
  • Improper compression pressure
  • 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 data list

  • Refer to Data List Reference Table .

  1. Item 5: No. 1 intake air temperature sensor
  2. Item 6: Engine coolant temperature sensor
  3. Item 10: Air flow sensor
  4. Item BB: Barometric pressure sensor

Q. Are the check results normal?
Go to Step 4.
Perform the diagnosis code classified check procedure for the sensor that has shown an abnormal data value (Refer to Inspection Chart for Diagnosis Code ).

STEP 4. Check throttle body (throttle valve portion) contamination.

Q. Is the check result normal?
Go to Step 5.
Clean throttle body (throttle valve portion) (Refer to ).

STEP 5. 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 6.
Check fuel pump system (Refer to Inspection Procedure 20 ).

STEP 6. Check air intake from inlet hose and inlet manifold.

Q. Is the check result normal?
Go to Step 7.
Repair.

STEP 7. Check injector for operating sound.

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

Q. Is operating sound audible?
Go to Step 8.

    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 8. Check timing mark on the timing chain.

Q. Is the check result normal?
Go to Step 9.
Align the timing marks.

STEP 9. 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 10.
Check ignition circuit system (Refer to Inspection Procedure 22 ).

STEP 10. Check injector for spray condition.

  • Check each injector for spray condition (Refer to ).

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

STEP 11. Fuel pressure measurement.

  • Fuel pressure measurement (Refer to ).

Q. Is the check result normal?
Go to Step 12.
Repair.

STEP 12. Check compression pressure.

  • Check the compression pressure (Refer to GROUP 11E - On-vehicle Service - Compression Pressure Check ).

Q. Is the check result normal?
Go to Step 13.
Repair.

STEP 13. 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.