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Home >> Buick >> 2003 >> Regal LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0502: Vehicle Speed Sensor Circuit - Low Output >> Test Description

Test Description

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

  1. 3

    This step test 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.