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Diagnostic Trouble Code: 118
Diagnostic Trouble Code Name: Engine Coolant Temperature Sensor (ECT) circuit high input
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:
HO2S Circuit Sensor 1
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P0130-P0134 or P2A00
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. Heating elements inside the heated oxygen sensor (HO2S) 1 minimize the time required for the sensors to reach operating temperature. The engine control module (ECM) supplies the heated oxygen sensor (HO2S) 1 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) 1 voltage signal. Once the heated oxygen sensor (HO2S) 1 reaches operating temperature and closed loop is achieved, the heated oxygen sensor (HO2S) 1 generates a voltage within a range of 0-1000?mV that fluctuates above and below bias voltage. High heated oxygen sensor (HO2S) 1 voltage indicates a rich exhaust stream. Low heated oxygen sensor (HO2S) 1 voltage indicates a lean exhaust stream.
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