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Inspection Procedure
18: Odor, White Smoke, Black Smoke, and High-Concentration CO/HC During Idling
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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.
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PROBABLE CAUSE
- Failed air-fuel control system
- Failed intake and exhaust system
- Failed emission control system
- Failed compression pressure
- Failed catalytic converter
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| STEP 1. MUT-II/III self-diag code Q: Diagnosis code set?
YES:
Inspection chart for diagnosis code (Refer to  ).
NO:
Go to Step 2  .
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| STEP 2. Check injector for operating sound. - Check injector for operating sound (Refer to ).
Q: Can operating sound be heard?
YES:
Go to Step 3 .
NO:
- 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 ).
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| STEP 3. Check ignition timing. - Check ignition timing (Refer to GROUP 11A -
On-vehicle Service ).
Check ignition timing (Refer to GROUP 11C -
On-vehicle Service ).
Q: Is the check result normal?
YES:
Go to Step 4 .
NO:
Check for offset ignition timing (Refer to Inspection Procedure 16 ).
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| STEP 4. MUT-II/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
- Item 25: Barometric pressure sensor <DOHC>
Q: Are the check results normal?
YES:
Go to Step 5 .
NO:
Perform the diagnosis code classified check procedure for the sensor that has
shown an abnormal data value (Refer to Inspection Chart for Diagnosis Codes ).
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| STEP 5. Check air intake from intake hose and intake manifold. Q: Is the check result normal?
YES:
Go to Step 6 .
NO:
Repair.
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| STEP 6. Check for emission leakage from exhaust manifold. Q: Is the check result normal?
YES:
Go to Step 7 .
NO:
Repair.
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| STEP 7. Check throttle body (throttle valve portion) for contamination. Q: Is the check result normal?
YES:
Go to Step 8 .
NO:
Clean throttle body (throttle valve portion) (Refer to ).
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| STEP 8. MUT-II/III data list - Refer to Data list reference table .
- Item 11: Oxygen sensor (front) <SOHC>
- Item 11: Oxygen sensor <DOHC>
Q: Is the check result normal?
YES:
Go to Step 9 .
NO:
- Check oxygen sensor system (front) (Refer
to Code No. P0130 <SOHC> ).
- Check oxygen sensor system (Refer to Code No. P0130 <DOHC> ).
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| STEP 9. Check Purge control solenoid valve itself. - Check Purge control solenoid valve itself (Refer to GROUP 17 -
Emission
Control System -
Evaporative Emission Control System ).
Q: Is the check result normal?
YES:
Go to Step 10 .
NO:
Replace purge control solenoid valve.
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| STEP 10. Check EGR control solenoid valve itself. - Check EGR control solenoid valve itself [Refer to GROUP 17 -
Emission
Control System -
Exhaust Gas Recirculation (EGR) System ].
Q: Is the check result normal?
YES:
Go to Step 11 .
NO:
Replace EGR control solenoid valve.
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| STEP 11. Check EGR valve itself. - Check EGR valve itself [Refer to GROUP 17 -
Emission Control
System -
Exhaust Gas Recirculation (EGR) System ].
Q: Is the check result normal?
YES:
Go to Step 12 .
NO:
Replace EGR valve.
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| STEP 12. Measure fuel pressure. - Measure fuel pressure (Refer to ).
Q: Is the check result normal?
YES:
Go to Step 13 .
NO:
Repair.
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| STEP 13. Check positive crankcase ventilation valve itself. - Check positive crankcase ventilation valve itself (Refer to GROUP 17 -
Emission
Control System -
Evaporative Emission Control System ).
Q: Is the check result normal?
YES:
Go to Step 14 .
NO:
Replace positive crankcase ventilation valve.
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| STEP 14. Check spark plug. Q: Is the check result normal?
YES:
Go to Step 15 .
NO:
Replace spark plug.
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| STEP 15. Check spark plug cable itself. - Check spark plug cable itself (Refer to GROUP 16 -
Ignition System -
On-vehicle
Service ).
Q: Is the check result normal?
YES:
Go to Step 16 .
NO:
Replace spark plug cable.
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| STEP 16. Check ignition coil itself. - Check ignition coil itself (Refer to GROUP 16 -
Ignition System -
On-vehicle
Service ).
Q: Is the check result normal?
YES:
Go to Step 17 .
NO:
Replace ignition coil.
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| STEP 17. Check compression pressure. - Check compression pressure (Refer to GROUP 11A -
On-vehicle Service ).
Check compression pressure (Refer to GROUP 11C -
On-vehicle Service ).
Q: Is the check result normal?
YES:
Go to Step 18 .
NO:
Repair.
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| STEP 18. Check injector for spraying condition. - Check each injector for spray condition (Refer to ).
Q: Does trouble symptom persist?
YES:
Go to Step 19 .
NO:
Replace injector.
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| STEP 19. Replace catalytic converter. - After replacing the catalytic converter re-check the trouble symptoms.
Q: Does trouble symptom persist?
YES:
Replace engine-A/T-ECU.
NO:
Check end.
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