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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P0500: Vehicle Speed Sensor ("S" & "T" Series With M/T Only) >> Test Description

Test Description

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

  1. 4 -  The vehicle speed detector in the PCM and the VSS are matched in such a way that an open or a short to ground in the VSS low signal circuit will not usually cause a loss of speed signal or a DTC P0500 to set.
  2. 7 -  This step isolates the short between the VSS and the wiring.
  3. 9 -  The DVOM will detect AC voltage if the VSS high signal circuit is shorted to ground.
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