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Diagnostic Trouble Code: 123
Diagnostic Trouble Code Name: Throttle Position Sensor (TP) circuit high input
Vehicle Make: Ford
Vehicle Model: Falcon (EL)
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:
HO2S Circuit High Voltage Sensor 2
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P0137-P0140, P2270, P2271, or P2A01
Circuit / System Description
Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. The heated oxygen sensor (HO2S) 2 compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The heated oxygen sensor (HO2S) 2 must reach operating temperature to provide an accurate voltage signal. Heating elements inside the heated oxygen sensor (HO2S) 2 minimize the time required for the sensors to reach operating temperature. The engine control module (ECM) supplies the heated oxygen sensor (HO2S) 2 with a reference, or bias, voltage of about 450?mV. When the engine is first started, the ECM operates in open loop, ignoring the heated oxygen sensor (HO2S) 2 voltage signal. Once the heated oxygen sensor (HO2S) 2 reaches operating temperature and closed loop is achieved, the heated oxygen sensor (HO2S) 2 generates a voltage within a range of 0-1000?mV that fluctuates above and below bias voltage. High heated oxygen sensor (HO2S) 2 voltage indicates a rich exhaust stream. Low heated oxygen sensor (HO2S) 2 voltage indicates a lean exhaust stream.
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