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VSS No. 1 Circuit (Speedometer Operates)

  1. Remove instrument cluster, but leave electrical connectors attached. Raise and support vehicle with one front wheel off of ground. Turn ignition on. Connect voltmeter between chassis ground and terminal No. 14 (Violet/Yellow wire) of instrument cluster top center connector. Rotate front wheel.
  2. If voltage alternates between zero and 5 or more volts for each revolution of wheel, go to next step. If voltage does not alternate between zero and 5 or more volts, replace character plate (speedometer assembly). Recheck voltage. If voltage is still incorrect, replace instrument cluster computer.
  3. Check for open or shorted Violet/Yellow wire between instrument cluster and ECM. See COMPONENT LOCATIONS  under INTRODUCTION. If Violet/Yellow wire is okay, replace ECM.
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