Excessive hydrocarbon (HC) emission or carbon monoxide (CO) emission
Precautions: General safety (00)
Perform troubleshooting referring to the following points when ECM has detected no DTC and no abnormality has been found in Visual Inspection:M16A and Engine Basic Inspection:M16A.
| Condition | Possible Cause | Action |
|---|---|---|
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Excessive hydrocarbon (HC) emission or carbon monoxide (CO) emission
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Faulty spark plug
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Faulty ignition coil assembly
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Low compression
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Lead contamination of TWC
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Check for absence of filler neck restrictor.
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Faulty evaporative emission control system
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Fuel pressure out of specification
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Faulty closed loop system (A/F feedback compensation) (Poor performance of ECT sensor or MAP sensor)
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Faulty electric throttle body assembly
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Faulty APP sensor
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Faulty fuel injector
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Faulty ECM
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Engine not at normal operating temperature
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—
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Clogged air cleaner
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Vacuum leakage
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VVT system out of order
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•VVT actuator: VVT Actuator, Camshaft, Tappet and Shim Inspection:M16A
•Valve timing: Timing Chain and Chain Tensioner Inspection:M16A •OCV oil circuit: Timing Chain Cover Inspection:M16A |