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Diagnostic Trouble Code: B0081
Diagnostic Trouble Code Name: Passenger Presence Module
Vehicle Make: Chevrolet
Vehicle Model: Cruze (J300)
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:
Knock Sensor Performance Bank 2
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P0326, P0327, P0328, P0331, P0332, or P0333 for the 2.8L, 3.0L, 3.2L, or 3.6L engine (without LF1)
Circuit / System Description
The knock sensor is a piezoelectric device that produces an AC voltage of different amplitude and frequency depending on the level of engine mechanical vibration. The knock sensor system monitors the knock sensor in order to determine if detonation or spark knock is present. If the knock sensor system determines that excessive knock is present, the engine control module (ECM) retards the spark timing based on the signal from the knock sensor system. The knock sensor produces an AC signal when specific frequencies are detected. The ECM then retards the timing until knock is controlled.
In order to differentiate between normal engine noise and spark knock, the ECM samples the knock sensor signal. The ECM samples the knock sensor signal for a certain length of time under different engine speeds and loads during non-cylinder knock events. This sampling is used to determine a range of acceptable normal engine noise.
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