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Scorpio (Speedometer Pointer Is Not Steady)

  1. Turn ignition switch to "RUN" position. Place transmission in neutral. Raise and support vehicle. Disconnect speed sensor connector. Using jumper wires, jump pins No. 1, 2 and 3 of sensor side of connector with same pins on harness side. Connect a voltmeter between sensor side connector pin No. 1 (negative lead) and pin No. 2 (positive lead).
  2. Slowly rotate rear wheel and check voltage. Voltage should cycle to greater than 5.5 volts and decrease to less than 1.5 volts in at least 8 cycles. If okay, replace speedometer. If not, replace speed sensor.
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