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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 46 (Engine Controls Self-Diagnostics - 4.3L) >> Diagnostic Tests >> DTC P0140: Ho2S Circuit - Insufficient Activity - Bank 1, Sensor 2 >> Test Description

Test Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Sonoma, 2002 GMC Safari, 2002 GMC Jimmy, 2002 Chevrolet S10 Pickup, and 2002 Chevrolet Blazer. 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

    After the ignition is turned ON, the HO2S heater heats up causing the HO2S signal voltage to either increase or decrease. This indicates that the HO2S heater is okay.

  2. 3

    If the HO2S voltage is varying outside the specified range, the condition is not present.

  3. 6

    If the voltage is below the specified value, the high signal circuit, the low reference circuit, and the PCM are okay.

  4. 15

    Resistance within the specified range indicates the HO2S heater is okay.

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