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Home >> Ford >> 1992 >> Thunderbird Base, 5.0 T >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Automatic Ride Control >> Circuit Diagnostic Tests >> Module Input Test D18 >> Speed Sensor

Speed Sensor

  1. Check speedometer operation. If speedometer and speed sensor are okay, replace ARC module. If speedometer has an obvious problem, go to next step.
  2. Raise vehicle, and disconnect transmission-mounted speed sensor harness connector. Using DVOM, check resistance between 2 wire terminals of sensor connector. If resistance is not 200-300 ohms, replace speed sensor.
  3. If resistance is 200-300 ohms, connect DVOM on voltmeter (AC scale) between 2 wire terminals of sensor connector. With vehicle raised, operate rear wheels, and note if DVOM reading is 1.3-6.1 AC volts. If DVOM reading is zero AC volts, replace speed sensor.
  4. If DVOM reading is 1.3-6.1 AC volts, ensure teeth of both speed sensor gears are in good condition. Also check speedometer fuse and wiring from sensor to ARC module and speedometer. Check instrument cluster circuit for loose screws, bad terminals and obviously damaged circuit board. If no problem is found, replace ARC module.
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