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Diagnostic Trouble Code: 129
Diagnostic Trouble Code Name: No Manifold Absolute Pressure (MAP I6) or Mass Air Flow (MAF V8) change in goose
Vehicle Make: Ford
Vehicle Model: Falcon (EF)
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 Circuit High Voltage Bank 1
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P0326, P0327, P0328, P0331, P0332, or P0333
Circuit / System Description
The knock sensor (KS) is a piezoelectric device that produces an AC voltage of different amplitude and frequency depending on the level of engine mechanical vibration. The KS system monitors the knock sensor in order to determine if detonation or spark knock is present. If the KS system determines that excessive knock is present, the engine control module (ECM) retards the spark timing based on the signal from the KS system. The KS 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 KS signal. The ECM samples the KS 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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