|
Diagnostic Trouble Code: B1255
Diagnostic Trouble Code Name: Air temperature external sensor circuit open
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:
HO2S Heater Control Circuit Low Voltage Sensor 1
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P0030-P0032, or P0135
Circuit / System Description
Heated oxygen sensors (HO2S) are used for fuel control and post-catalyst monitoring. The heated oxygen sensor (HO2S) 1 compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The heated oxygen sensor (HO2S) 1 must reach operating temperature to provide an accurate voltage signal. A heating element inside the heated oxygen sensor (HO2S) 1 minimizes the time required for the sensor to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, ground is provided to the heater by the heated oxygen sensor (HO2S) 1 heater low control circuit, through a low side driver within the engine control module (ECM). The ECM uses pulse-width modulation (PWM) to control the heated oxygen sensor (HO2S) 1 heater operation to maintain a specific heated oxygen sensor (HO2S) 1 operating temperature range.
|
