Inspection Procedure 16: Odour, White Smoke, Black Smoke and High-concentration of CO/HC during Idling




COMMENTS ON TROUBLE SYMPTOM




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


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


Q. Is diagnosis code set?

Inspection chart for diagnosis code (Refer to ).
Go to Step 2.

STEP 2. Check injector for operating sound.



  • Injector check (Refer to ).

Q. Is operating sound audible?

Go to Step 3.
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 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 Inspection Procedure - ignition timing deviation (Refer to ).

STEP 4. 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
  4. Item 10: Air flow sensor
  5. Item BB: Barometric 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. Inspection chart for diagnosis code (Refer to ).

STEP 5. Check air intake from inlet hose and inlet manifold.


Q. Is the check result normal?

Go to Step 6.
Repair.

STEP 6. Check exhaust leak from exhaust manifold.


Q. Is the check result normal?

Go to Step 7.
Repair.

STEP 7. Check throttle body (throttle valve portion) contamination.


Q. Is the check result normal?

Go to Step 8.
Throttle body (throttle valve area) cleaning (Refer to ).

STEP 8. M.U.T.-III data list



  • Data list reference table (Refer to ).

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

Q. Are the check results normal?

Go to Step 9.
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 9. Check purge control solenoid valve itself.



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

Q. Is the check result normal?

Go to Step 10.
Replace the purge control solenoid valve.

STEP 10. Fuel pressure measurement.



  • Fuel pressure test (Refer to ).

Q. Is the check result normal?

Go to Step 11.
Repair.

STEP 11. Check positive crankcase ventilation valve itself.



  • Check positive crankcase ventilation valve itself (Refer to GROUP 17 - Emission Control - Crankcase Emission Control System - Positive Crankcase Ventilation Valve Check ).

Q. Is the check result normal?

Go to Step 12.
Replace the positive crankcase ventilation valve.

STEP 12. 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 13.
Replace the spark plug.

STEP 13. Check compression pressure.



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

Q. Is the check result normal?

Go to Step 14.
Repair.

STEP 14. Check injector for spray condition.



  • Injector check (Refer to ).

Q. Is the check result normal?

Go to Step 15.
Replace the injector.

STEP 15. Replace the catalytic converter.



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

Q. Does the trouble symptom persist?

Replace the engine-ECU.
Check end.