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
  • 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

  • Data list reference table (Refer to ).

  1. Item 5: Intake air temperature sensor
  2. Item 6: Engine coolant temperature sensor
  3. Item 8: Manifold absolute 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. Inspection chart for diagnosis code (Refer to ).

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

Q. Is the check result normal?
Go to Step 5 .
Throttle body (throttle valve area) cleaning (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 Inspection Procedure - fuel pump system (Refer to ).

STEP 6. Check injector for operating sound.

  • Injector check (Refer to ).

Q. Is operating sound audible?
Go to Step 7 .
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 7. Check timing mark on the timing chain.

Q. Is the check result normal?
Go to Step 8 .
Align the timing marks.

STEP 8. 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 9 .
Check Inspection Procedure - ignition circuit system (Refer to ).

STEP 9. Check injector for spray condition.

  • Injector check (Refer to ).

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

STEP 10. Fuel pressure measurement.

  • Fuel pressure test (Refer to ).

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

STEP 11. 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 12 .
Repair.

STEP 12. 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.