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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 385 (Engine Controls Self-Diagnostics) >> 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 2003 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. 4

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

  3. 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.

  4. 6

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

  5. 7

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

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