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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 111 (Engine Controls - Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0134: Ho2S1 Circuit - Insufficient Activity >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Normal scan tool reading in closed-loop will show O2S voltage varying between 10-1065 millivolts.

To locate an intermittent problem, use scan tool to monitor HO2S1 voltage with engine at normal operating temperature. Bias voltage (399-499 millivolts) will appear on scan tool if Purple wire or Tan wire are open.

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