|
Diagnostic Trouble Code: B1251
Diagnostic Trouble Code Name: Air Temperature Internal Sensor Circuit Open Input floats > 4.56V
Vehicle Make: Ford
Vehicle Model: Falcon (FG)
Diagnostic Code Entered By: ZerOne
Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
|
Please Note: The DTC Information provided has been randomly generated.
To view the correct Diagnostic Code Information, Please Login, or Register.
Diagnostic Trouble Code Description:
Knock Sensor (KS) 1 Circuit Low Frequency
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTCP0327 or P0332
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 ECM monitors two separate KS, one on each side of the engine block. Each KS produces an AC voltage signal that varies with different engine speeds and loads. The ECM adjusts the spark timing based on the amplitude and the frequency of the KS signal. The ECM receives the KS signal through a signal circuit. The KS ground is supplied by the ECM through a low reference circuit. The ECM uses the KS signal to calculate the average voltage, then assign a voltage range value. The ECM will then monitor for a normal KS signal within the assigned voltage range. If the ECM detects a KS signal outside of the assigned voltage range, or the KS signal is not present, this DTC will set.
|
