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Diagnostic Trouble Code: B0408
Diagnostic Trouble Code Name: Drivers Air Mix Door Motor Circuit
Vehicle Make: Chevrolet
Vehicle Model: Caprice (VE)
Diagnostic Code Entered By: ZerOne
Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
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Please Note: The DTC Information provided has been randomly generated.
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Diagnostic Trouble Code Description:
Cold Start Emission Reduction Control System
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P1400
Circuit / System Description
The catalytic converter must be warmed to efficiently reduce the emissions. The cold start strategy is to reduce the amount of time it takes to warm the catalytic converter. During a cold start, the engine idle speed is elevated and spark timing is retarded to allow the catalyst to warm quickly. This diagnostic monitors the following to build an exhaust energy model:
Engine speed
Spark advance
Throttle position
Engine airflow
Engine coolant temperature
Engine runtime
Park/neutral position
Vehicle speed
The actual model is then compared to the expected exhaust energy model.
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