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

COMMENT ON TROUBLE SYMPTOM

Failure is possibly caused by improper air-fuel ratio, deteriorated catalyst, failed ignition system, failed fuel system, failed compression pressure or other faults.

PROBABLE CAUSES

Incorrect air/fuel ratio
Failed ignition system
Failed fuel system
Failed intake and exhaust system
Failed emission control system
Failed compression pressure
Failed catalytic converter
Failed engine-ECU

DIAGNOSIS PROCEDURE

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

Q. 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 11E - On-vehicle Service - Ignition Timing Check ).

Q. Is the check result normal?

	Go to Step 4 .

	Check for offset ignition timing (Refer to Inspection Procedure 15 ).

STEP 4. M.U.T.-III data list

Refer to Data List Reference Table .

Item No. 6: Intake air temperature sensor
Item No. 8: Engine coolant temperature sensor
Item No. 80: Air flow 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. M.U.T.-III data list

Refer to Data List Reference Table .

Item No. 79: Barometric pressure sensor

Q. Is the check result normal?

	Go to Step 6 .

	Replace the engine-ECU then perform the variant coding (Refer to GROUP 00 - Precautions Before Service - How to Perform Variant Coding ).

STEP 6. Check air intake from intake hose and intake manifold.

Q. Is the check result normal?

	Go to Step 7 .

	Repair.

STEP 7. Check for emission leakage from exhaust manifold.

Q. Is the check result normal?

	Go to Step 8 .

	Repair.

STEP 8. Check throttle body (throttle valve portion) for contamination.

Q. Is the check result normal?

	Go to Step 9 .

	Clean throttle body (throttle valve portion) (Refer to ).

STEP 9. M.U.T.-III data list

Refer to Data List Reference Table .

Item No. 9: Oxygen sensor (front)
Item No. 10: Oxygen sensor (rear)

Q. Are the check result normal?

	Go to Step 10 .

	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 10. Check Purge control solenoid valve itself.

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

Q. Is the check result normal?

	Go to Step 11 .

	Replace the purge control solenoid valve.

STEP 11. Fuel pressure measurement.

Measure fuel pressure (Refer to Fuel Pressure Test ).

Q. Is the check result normal?

	Go to Step 12 .

	Repair the fuel pressure.

STEP 12. Check positive crankcase ventilation valve itself.

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

Q. Is the check result normal?

	Go to Step 13 .

	Replace the positive crankcase ventilation valve.

STEP 13. 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?

	Go to Step 14 .

	Replace the spark plug.

STEP 14. Check ignition coil itself.

Check ignition coil itself (Refer to GROUP 16 - Ignition System - On-vehicle Service - Ignition Coil Check ).

Q. Is the check result normal?

	Go to Step 15 .

	Replace the ignition coil.

STEP 15. Check compression pressure.

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

Q. Is the check result normal?

	Go to Step 16 .

	Repair the compression pressure.

STEP 16. Check injector for spraying condition.

Check each injector for spray condition (Refer to ).

Q. Does trouble symptom persist?

	Go to Step 17 .

	Replace the injector.

STEP 17. Replace catalytic converter.

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

Q. Does trouble symptom persist?

	Replace the engine-ECU then perform the variant coding (Refer to GROUP 00 - Precautions Before Service - How to Perform Variant Coding ).

	Check end