LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P0135, P0141 & P0155: Ho2S Heater Circuit - Bank 1 & 2, Sensors 1 & 2 (Astro & Safari) >> Test Description

Test Description

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. 7

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

  3. 9

    Resistance within the specified range indicates the HO2S heater is okay.
scientia non olet · About LEMON Manuals