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Vehicle Speed Sensor (VSS) Test

  1. Disconnect ECM connector containing Dark Green/White wire. Connect Red wire of Signal Generator Instrument Panel Tester (J-33431-B) to Dark Green/White wire. Connect Black wire of tester to a good ground. Set tester to 54 MPH. Turn ignition switch to RUN position.
  2. If speedometer reads 54 MPH, check for poor connection at Dark Green/White wire of ECM connector. If okay, replace ECM. If speedometer does not read 54 MPH, check for open or short in Dark Green/White wire between ECM and Cruise control module and instrument cluster. Check for poor connection at instrument panel connector. If okay, service instrument cluster.
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