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Home >> Pontiac >> 2001 >> Aztek Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 113 (Engine Controls Self-Diagnostics - 2.2L CNG) >> Diagnostic Tests >> DTC P0134: O2S1 Circuit - Insufficient Activity >> Test Description

Test Description

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

The number below refer to the step number on the diagnostic procedure.

  1. 2

    This step determines if proper sensor activity is present. When in Closed Loop fuel control the O2S voltage should rapidly swing greater than and less than the bias voltage.

  2. 6

    This step determines if the PCM and the high and low circuits between the control module and the O2S connector are operating properly.

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