FixVault
Home › Ford › 1993 › Escort Base, Standard › Repair and Diagnosis › Accessories & Equipment › Cruise Control Systems › Testing › Vehicle Speed Sensor (VSS)

Vehicle Speed Sensor (VSS)

  1. Unplug 6-pin connector at amplifier. On Continental, measure resistance between circuits No. 679 (Gray/Black wire) and No. 57 (Black wire). On Cougar, Sable, Taurus, Tempo, Thunderbird and Topaz, measure resistance between circuits No. 150 (Dark Green/White wire) and No. 57 (Black wire).
  2. On Escort and Tracer, measure resistance between circuits No. 57 (Blue wire on 1.9L; thin Green wire on 1.8L) and circuit No. 59 (White/Black wire). On Mustang, unplug VSS, located at transmission. Measure resistance between VSS terminals.
  3. On all models, resistance should be 200-300 ohms. Resistance near zero ohms indicates a shorted coil; high resistance indicates an open coil in sensor or open wire in harness.
  4. If test was performed at amplifier connector, repeat test at sensor terminals. Replace sensor if resistance is not 200-300 ohms. Repair wiring harness if sensor resistance is okay.
  5. If resistance is 200-300 ohms and speedometer operates properly without needle waver, sensor is probably good. If necessary, substitute a known good sensor to check operation.
About FixVault