Inspection Procedure 7: Starting Impossible (initial combustion but no complete combustion), Improper Starting (long time to start)




COMMENTS ON TROUBLE SYMPTOM




PROBABLE CAUSES




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 code (Refer to ).
Go to Step 3.

STEP 3. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. Item 5: Intake air temperature sensor
  2. Item 6: Engine coolant temperature sensor
  3. Item 8: Manifold absolute pressure sensor
  4. Item 10: Air flow sensor
  5. Item BB: Barometric pressure sensor

Q. Are the check results normal?

YES : 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 Inspection Procedure - fuel pump system (Refer to ).

STEP 6. Check air intake from intake 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. Check code No. P0261: No. 1 injector circuit low input (Refer to ). Check code No. P0262: No. 1 injector circuit high input (Refer to ). Check code No. P0264: No. 2 injector circuit low input (Refer to ). Check code No. P0265: No. 2 injector circuit high input (Refer to ). Check code No. P0267: No. 3 injector circuit low input (Refer to ). Check code No. P0268: No. 3 injector circuit high input (Refer to ). Check code No. P0270: No. 4 injector circuit low input (Refer to ). Check code No. P0271: No. 4 injector circuit high input (Refer to ).

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 Inspection Procedure - ignition circuit system (Refer to ).

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 11C - 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, kerosene, etc.) in fuel and replace if necessary.
Check end.