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Diagnostic Trouble Code: B0228
Diagnostic Trouble Code Name: Recirculation Door Motor Circuit
Vehicle Make: Pontiac
Vehicle Model: G8 (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:
Knock Sensor (KS) Performance
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTCP0326
Circuit / System Description
The knock sensor (KS) system enables the engine control module (ECM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The KS produces an A/C signal that varies with different engine speeds and loads. The ECM makes adjustments to the spark timing based on the amplitude and frequency of either KS signal. The ECM receives the KS signal through a signal circuit. The ECM supplies the KS ground through a low reference circuit. The ECM uses the KS to calculate the amount of normal engine noise for a wide range of engine speeds and loads. The normal engine noise that has been calculated and retained in the ECM memory is called the learned noise channel. The ECM compares the actual KS signal to the learned noise channel in memory. When the ECM determines that the KS signal is outside the limits of the learned noise channel, the ECM will retard the spark timing until the knock goes away. If the knock is such that the engine requires a large amount of spark retard and the ECM is unable to eliminate the knock, this DTC will set. DTC?P0326 refers to either the bank?1 KS or the bank?2 KS.
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