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 voltage.

  • Measure battery voltage at cranking.
OK: 8 V or higher

Q. Is the check result normal?
Go to Step 2 .
Check battery (Refer to GROUP 54A - Battery - On-vehicle Service - Battery Test ).

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 05: Intake air temperature sensor
    2. Item 06: Engine coolant temperature sensor
    3. Item 08: Manifold absolute pressure sensor
    4. Item 10: Air flow 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 09: 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 21 ).

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 the check result normal?
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 ).
    (Refer to Code No. P0205: No. 5 Injector System ).
    (Refer to Code No. P0206: No. 6 Injector System ).

STEP 8. Check timing mark on the timing belt.

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.
  • Remove all injector connectors.
  • At the engine start, check each spark plug procedures a spark.

Q. Is the check result normal?
Go to Step 11 .
Go to Step 10 .

STEP 10. Check spark plug

  • Check spark plug itself (Refer to GROUP 16 - Ignition System - On-vehicle Service - Spark Plug Check and Cleaning ).

Q. Is the check result normal?
Check ignition circuit system (Refer to Inspection Procedure 26 ).
Replace the spark plug.

STEP 11. Check injector for spray condition.

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

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

STEP 12. Fuel pressure measurement.

  • Fuel pressure measurement (Refer to ).

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

STEP 13. 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 14 .
Repair.

STEP 14. Check exhaust gas recirculation valve itself.

  • Check exhaust gas recirculation valve itself (Refer to GROUP 17 - Emission Control - Exhaust Gas Recirculation Valve - Exhaust Gas Recirculation Valve (Stepper Motor) Check ).

Q. Is the check result normal?
Go to Step 15 .
Replace the exhaust gas recirculation valve.

STEP 15. Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.

  • After the engine-ECU <M/T> or engine-A/T-ECU <A/T> has been replaced, check for the trouble symptom again.

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