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Vehicle Speed Sensor

  1. Disconnect negative battery cable. Disconnect ECM connectors. Connect ohmmeter between terminal No. 17 and body ground. Raise front wheels off ground. Resistance between terminal No. 17 and ground should read zero ohm when both wheels are turned by hand.
  2. If resistance is not as specified, check wires and connectors between ECM and vehicle speed sensor. Remove instrument cluster bezel and cluster assembly. Remove speedometer.
  3. Connect ohmmeter to 2 speed sensor terminals on back of speedometer. Ohmmeter should indicate open or closed circuit. Turn speedometer cable joint one full turn gradually clockwise.
  4. Ohmmeter should indicate open or closed circuit 4 times opposite than step 3). If sensor does not operate as specified, replace speedometer.
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