Inspection Procedure 17: Odor, White Smoke, Black Smoke, and High-concentration of CO/HC during Idling


COMMENT ON TROUBLE SYMPTOM



  • The failure could possibly be caused by the improper air-fuel ratio, deteriorated catalyst, failed ignition system, defective fuel system, faulty compression pressure and so on.

PROBABLE CAUSES



  • Failed air-fuel ratio control system
  • Failed ignition system
  • Failed fuel system
  • Failed exhaust system
  • Failed compression pressure
  • Deteriorated catalyst
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q. Is the diagnosis code set?
Inspection chart for diagnosis code (Refer to ).
Go to Step 2 .

STEP 2. Check injector for operating sound.

  • Check injector for operating sound (Refer to ).

Q. Can operating sound be heard?
Go to Step 3 .

    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 3. Check ignition timing.

  • Check ignition timing (Refer to GROUP 11A - On-vehicle Service - Ignition Timing Check ).

Q. Is the check result normal?
Go to Step 4 .
Check for ignition timing deviation (Refer to Inspection Procedure 15 ).

STEP 4. 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

Q. Are the check results normal?
Go to Step 5 .
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 5. Check for emission leakage from exhaust manifold.

Q. Is the check result normal?
Go to Step 6 .
Repair.

STEP 6. Check throttle body (throttle valve portion) for contamination.

Q. Is the check result normal?
Go to Step 7 .
Clean throttle body (throttle valve portion) (Refer to ).

STEP 7. M.U.T.-III data list

  • Refer to Data List Reference Table .

  1. Item AC: Oxygen sensor (front)
  2. Item AD: Oxygen sensor (rear)

Q. Are the check results normal?
Go to Step 8 .
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 8. Check purge control solenoid valve itself.

  • Check purge control solenoid valve itself (Refer to GROUP 17 - Emission Control <MPI> - Evaporative Emission Control System - Purge Control Solenoid Valve Check ).

Q. Is the check result normal?
Go to Step 9 .
Replace the purge control solenoid valve.

STEP 9. Fuel pressure measurement.

  • Fuel pressure measurement (Refer to ).

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

STEP 10. Check positive crankcase ventilation valve itself.

  • Check positive crankcase ventilation valve itself [Refer to GROUP 17 - Emission Control <MPI> - Crankcase Emission Control System - Positive Crankcase Ventilation (PCV) Valve Check ].

Q. Is the check result normal?
Go to Step 11 .
Replace the positive crankcase ventilation valve.

STEP 11. Check spark plug.

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

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

STEP 12. Check compression pressure.

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

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

STEP 13. Check injector for spray condition.

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

Q. Does trouble symptom persist?
Go to Step 14 .
Replace the injector.

STEP 14. Replace the catalytic converter.

  • After replacing the catalytic converter, re-check the trouble symptoms.

Q. Does trouble symptom persist?
Replace the engine-ECU.
Check end.