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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 362 (Engine Controls Self-Diagnostics) >> Diagnostic Tests >> DTC P0503: Vehicle Speed Sensor Erratic >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 3 -  This step tests the ability of the VSS to produce an AC voltage. This step also verifies the integrity of the wiring to the PCM.
  2. 4 -  This step test the VSS circuit for correct resistance.

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