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

COMMENTS ON TROUBLE SYMPTOM

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

PROBABLE CAUSES

Failed air-fuel ratio control system
Failed ignition system
Failed fuel system
Failed intake and exhaust air system
Improper compression pressure
Deteriorated catalyst
Failed engine-ECU

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.

Check injector for operating sound (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

).Check code No. P0273: No. 5 injector circuit low input (Refer to

). Check code No. P0274: No. 5 injector circuit high input (Refer to

).Check code No. P0276: No. 6 injector circuit low input (Refer to

). Check code No. P0277: No. 6 injector circuit high input (Refer to

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

Refer to Data List Reference Table .

Item 5: Intake air temperature sensor
Item 6: Engine coolant temperature sensor
Item 8: Manifold absolute pressure sensor
Item 10: Air flow sensor
Item BB: Barometric pressure 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 ignition timing.

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

Q. Is the check result normal?

	Go to Step 5.

	Check ignition timing deviation (Refer to Inspection Procedure 14 ).

STEP 5. Check air intake from intake 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.

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

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

Refer to Data List Reference Table .

Item AC: Right bank oxygen sensor (front)
Item AD: Right bank oxygen sensor (rear)
Item AE: Left bank oxygen sensor (front)
Item AF: Left bank 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 (Refer to Inspection Chart for Diagnosis Code ).

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?

	YES : Go to Step 10.

	Replace the purge control solenoid valve.

STEP 10. Fuel pressure measurement.

Fuel pressure measurement. (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. 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 produces a spark.

Q. Is the check result normal?

	Go to Step 13.

	Check Inspection Procedure - ignition circuit system (Refer to ).

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 injector for spray condition.

Check each injector for spray condition (Refer to ).

Q. Is the check result normal?

	Go to Step 15.

	Replace the injector.

STEP 15. Replace the catalytic converter.

After replacing catalytic converter check the trouble symptom again.

Q. Does the trouble symptom persist?

	Replace the engine-ECU.

	Check end.