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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 83 (Engine Controls Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0140: Ho2S Circuit - Insufficient Activity (Sensor 2) >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Sonoma and 2002 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on 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 changes more than the specified value, the condition is not present.

  3. 5

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

  4. 6

    If the voltage is above the specified value, the low signal circuit is okay.

  5. 14

    Resistance below the specified value indicates the HO2S heater is shorted.
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