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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P0140 & P0160: Ho2S Circuit - Insufficient Activity - Bank 1 & 2, Sensor 2 >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 2

    Before you perform this test, the engine must be at the normal operating temperature.

  2. 3

    The Freeze Frame/Failure Records may help to locate an intermittent condition. If you cannot duplicate the DTC, the information in the Freeze Frame/Failure Records can help to determine how many miles have occurred since the DTC set. The Fail Counter and the Pass Counter can also determine how many ignition cycles have occurred since the diagnostic reported a pass and/or a fail. In order to isolate when the DTC failed, operate the vehicle within the same Freeze Frame conditions that the PCM recorded. These conditions include the RPM, the vehicle load, the vehicle speed, and the temperature.

  3. 4

    If the scan tool indicates the HO2S voltage goes below 200 mV, the HO2S circuits and PCM are okay.

  4. 5

    This step verifies whether the HO2S low signal circuit from the PCM is okay.

  5. 6

    This step verifies whether the HO2S low signal circuit from the PCM is okay. A voltage indicates that the PCM and wiring are okay.

  6. 7

    Disconnecting the PCM allows using a Digital Multimeter (DMM) in order to test the circuit continuity. This procedure helps to locate a circuit that is open or shorted.

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