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Diagnostic Trouble Code: 27
Diagnostic Trouble Code Name: Shift Lever Position Input fault. Voltage measured by TCM across the shift lever input terminals is outside the expected range
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 Sensor 2
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P0136
Circuit / System Description
The heated oxygen sensor (HO2S) 2 circuit diagnostics monitors the voltage on the signal circuit of the post catalyst oxygen sensor. In order to control emissions of hydrocarbons, carbon monoxide (CO), and oxides of nitrogen (NOX), a 3-way catalytic converter is used. The catalyst within the converter promotes a chemical reaction which oxidizes the hydrocarbons and CO present in the exhaust gas, converting the hydrocarbons and the CO into harmless water vapor and carbon dioxide. The catalyst also reduces NOX by converting the NOX to nitrogen. The engine control module (ECM) has the ability to monitor this process using the heated oxygen sensors HO2S?1 and heated oxygen sensor (HO2S) 2. The heated oxygen sensor (HO2S) 1 produces an output signal which indicates the amount of oxygen present in the exhaust gas entering the 3-way catalytic converter. The heated oxygen sensor (HO2S) 2 produces an output signal which indicates the oxygen storage capacity of the catalyst. This in turn indicates the catalysts ability to convert exhaust gases efficiently. If the catalyst is operating efficiently, the heated oxygen sensor (HO2S) 1 signal will be far more active than that produced by the heated oxygen sensor (HO2S) 2.
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