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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 113 (Engine Controls Self-Diagnostics - 5.7L Corvette) >> 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 Chevrolet Corvette. 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

    The engine must be at the normal operating temperature before you perform this test.

  2. 3

    Using the Freeze Frame and/or Failure Records data may help to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can help to determine the number of miles since the DTC set. You can also use the Fail Counter and the Pass Counter in order to determine how the number of ignition cycles in which the diagnostic reported a pass and/or a fail. Operate the vehicle within the same Freeze Frame conditions that the PCM recorded, including the RPM, the load, the vehicle speed, and the temperature. This procedure isolates when the DTC failed.

  3. 4

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

  4. 5

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

  5. 6

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

  6. 7

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

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