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Diagnostic Trouble Code: 7
Diagnostic Trouble Code Name: Automatic Temperature Controller
Vehicle Make: Chevrolet
Vehicle Model: Tosca (V250)
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 Signal Circuit Shorted to Heater Circuit Bank 2
Sensor 2
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P2232 or P2235
Circuit / System Description
The engine control module (ECM) supplies a voltage near 450?mV between the heated oxygen sensor (HO2S) signal circuit and the low reference circuit. The HO2S varies the voltage over a range from about 1,000?mV when the exhaust is rich, down through about 10?mV when the exhaust is lean. The ECM monitors and stores the HO2S voltage information. The ECM evaluates the HO2S voltage samples in order to determine the amount of time that the HO2S voltage was out of range. Or, to detect if the HO2S signal voltage switches at the same rate at which the ECM is commanding the heater ON and OFF.
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