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, improper compression pressure and so on.

PROBABLE CAUSE

Failed air-fuel ratio control system
Failed ignition system
Failed fuel system
Failed intake air/exhaust system
Failed exhaust gas cleaning system
Improper compression pressure
Failed catalytic converter
Failed engine-A/T-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. 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 offset ignition timing (Refer to Inspection Procedure 15 ).

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

Refer to Data List Reference Table .

Item 12: Air flow sensor
Item 13: Intake air temperature sensor
Item 21: Engine coolant temperature 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 25: Barometric pressure sensor

Q. Is the check result normal?

	Go to Step 6 .

	Replace engine-A/T-ECU.

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 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 11: Cylinder 1, 4 oxygen sensor (front)
Item 39: Cylinder 2, 3 oxygen sensor (front)
Item 59: Cylinder 1, 4 oxygen sensor (rear)
Item 69: Cylinder 2, 3 oxygen sensor (rear)

Q. Are the check results 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 purge control solenoid valve.

STEP 11. Check EGR valve (stepper motor) itself.

Check EGR valve (stepper motor) itself [Refer to GROUP 17 - Emission Control System - Exhaust Gas Recirculation (EGR) System - EGR Valve (Stepper Motor) Check ].

Q. Is the check result normal?

	Go to Step 12 .

	Replace EGR valve (stepper motor).

STEP 12. Fuel pressure measurement.

Fuel pressure measurement (Refer to Fuel Pressure Test ).

Q. Is the check result normal?

	Go to Step 13 .

	Repair.

STEP 13. 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 14 .

	Replace positive crankcase ventilation valve.

STEP 14. Check spark plug.

Q. Is the check result normal?

	Go to Step 15 .

	Replace spark plug.

STEP 15. Check ignition coil spark.

Q. Is the check result normal?

	Go to Step 16 .

	Check ignition circuit system (Refer to Inspection Procedure 26 ).

STEP 16. 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 17 .

	Repair.

STEP 17. Check injector for spray condition.

Check each injector for spray condition (Refer to ).

Q. Does the trouble symptom persist?

	Go to Step 18 .

	Replace injector.

STEP 18. Replace catalytic converter.

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

Q. Does the trouble symptom persist?

	Replace engine-A/T-ECU.

	Check end.