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Home >> GMC >> 2002 >> Jimmy 4D Utility, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P0135 & P0155: Ho2S Heater Circuit - Bank 1 & 2, Sensors 1 (Jimmy CANADIAN, SONOMA & S10 Pickup) >> Test Description

Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 2

    After the HO2S heater is commanded 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. 6

    Both HO2S sensors must be disconnected to isolate a short to ground in the HO2S heater high control circuit.

  3. 10

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

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