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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Engine Controls - Self-Diagnostics - 3.5L) >> Diagnostic Tests >> DTC P0140: Ho2S Circuit Insufficient Activity (Bank 1; Sensor 2) >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the Connector Test Adapter Kit (J-35616-A) for any test that requires probing the PCM harness connectors, electrical center fuse/relay cavities, component terminals and component harness connector. Using this kit will prevent damage caused by improper probing of connector terminals.

Check for a malfunctioning HO2S heater or heater circuit. With the ignition ON and the engine OFF, the HO2S voltage displayed on a scan tool should gradually drop below 250 millivolts or rise greater than 600 millivolts. If this does not occur, disconnect the HO2S and connect a test light between the HO2S ignition 1 voltage circuit and the heater low control circuit. If the test light does not light, repair the open ignition 1 voltage circuit or the sensor ground circuit as necessary. If the test light illuminates and HO2S high signal circuit and HO2S low reference circuit are okay, replace affected HO2S.

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