Diagnostic Trouble Code: 027
Diagnostic Trouble Code Name: Driver Window Express Up Switch Circuit
Vehicle Make: Daewoo
Vehicle Model: Tosca (V250)
Diagnostic Code Entered By: ZerOne
Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
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Diagnostic Trouble Code Description:
O2 Sensor Circuit High Volt
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTCP0132 or P0152
Circuit / System Description
Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. Heating elements inside the HO2S minimize the time required for the sensors to reach operating temperature. The engine control module (ECM) supplies the HO2S with a reference, or bias, voltage of about 450?mV. When the engine is first started the ECM operates in Open Loop, ignoring the HO2S voltage signal. Once the HO2S reaches operating temperature and Closed Loop is achieved, the HO2S generates a voltage within a range of 0-1,000?mV that fluctuates above and below bias voltage. High HO2S voltage indicates a rich exhaust stream. low HO2S voltage indicates a lean exhaust stream. If the ECM detects an HO2S voltage that stays above a specified value, DTC?P0132 sets for HO2S bank?1 sensor?1, or DTC?P0152 sets for HO2S bank?2 sensor?1.
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