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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 80 (Engine Controls Self-Diagnostics - 5.0L & 5,7L) >> Diagnostic Tests >> DTC P0140 & P0160: Ho2S Circuit - Insufficient Activity - Bank 1 & 2, Sensor 2 >> Test Description

Test Description

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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. 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. 12

    All oxygen sensors must be disconnected to isolate a short to ground in the HO2S heater ignition 1 voltage circuit.

  6. 14

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

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