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Home >> GMC >> 1991 >> C3500 HD 6.2 J, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel - C/K Series Pickups >> Component Tests >> Vehicle Speed Sensor Testing & Diagnosis >> Functional Test

Functional Test

  1. Lift and support rear of vehicle. Disconnect instrument cluster connector. Start engine, and place transmission in Drive. Using a voltmeter, measure voltage between instrument cluster connector terminals B13 (Purple/White wire) and B16 (Light Green/Black wire) while varying engine speed.
  2. If voltage varies with engine speed, vehicle speed sensor is okay. If no voltage is present, check wires for opens and connectors for tightness. If still no voltage is present, replace vehicle speed sensor.
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