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Speedometer/Odometer Inoperative

WARNING: This page is about a different car, the 1997 Mercury Mountaineer and 1997 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch off. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Measure voltage between ground and instrument cluster connector C288, terminal No. 7 (White/Yellow wire). See Figure . If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open in White/Yellow wire between instrument cluster connector and fuse No. 25 located in interior fuse panel and retest system.
  2. Disconnect Vehicle Speed Sensor (VSS) harness connector. Measure resistance of Gray/Black wire between instrument cluster connector C287, terminal No. 1 and VSS harness connector. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Gray/Black wire between instrument cluster connector and VSS harness connector and retest system.
    NOTE: Measurements must be made at speedometer gauge pins inside instrument cluster printed circuit clips.
  3. Measure resistance of printed circuit between speedometer pins (in center of clips) and corresponding instrument cluster connector terminal. See SPEEDOMETER PRINTED CIRCUIT CHECK  table. If all resistances are less than one ohm, go to next step. If any resistance is more than one ohm, replace instrument cluster printed circuit and retest system. See PRINTED CIRCUIT  under REMOVAL & INSTALLATION.
    SPEEDOMETER PRINTED CIRCUIT CHECK (1)

    Speedometer Pin Connector-Terminal
    "B" C288-7
    "G" C287-2
    "I" C266-4
    "S" C287-1
    (1) See Figure , Figure and Figure .
  4. Remove VSS from transmission. Measure resistance between VSS terminals. If resistance is 200-300 ohms, go to next step. If resistance is not 200-300 ohms, replace VSS and retest system.
  5. Measure AC voltage between VSS terminals while spinning VSS shaft. If voltage changes, go to next step. If voltage does not change, replace VSS and retest system.
  6. Inspect VSS driven gear for damage or wear. If driven gear is damaged or worn, replace driven gear and retest system. If driven gear is not damaged or worn, replace speedometer and retest system. See GAUGES  under REMOVAL & INSTALLATION.
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