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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 370 (Engine Control System - Self-Diagnostics - 4.2L) >> Diagnostic Tests >> DTC P1133: Ho2S Circuit - Insufficient Switching (Sensor 1) >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2 -  When the system is operating correctly, the HO2S 1 voltage should toggle greater than and less than the specified values. You may need to operate the vehicle within the Freeze Frame conditions and Conditions for Setting the DTC in order to duplicate the malfunction that was detected by the PCM.
  2. 4 -  The specified value is what is measured on a correctly operating system.
  3. 5 -  The specified value is what is measured on a correctly operating system.

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