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Speedometer/Odometer Reads Inaccurately (Ranger)

  1. Access Vehicle Speed Sensor (VSS). Ensure harness connector is clean, tight and securely attached. Clean, repair or replace as necessary. If VSS harness connector is okay, go to next step.
  2. Perform ODOMETER TEST  under COMPONENT TESTS. If odometer is operating and is accurate, go to next step. If odometer is not operating or is not accurate, go to step 4).
  3. Perform SPEEDOMETER CALIBRATION TEST  under COMPONENT TESTS. If speedometer is operating and is within specification, speedometer is operating properly. If speedometer is not operating or is not within specification, go to next step.
  4. Remove VSS. Ensure proper driven gear is installed. See Ford Speedometer Gear Supplement Charts for speedometer gear applications. Refer to Ford Motor Co. Parts department for Speedometer Gear Supplement charts. If correct driven gear is installed, go to next step. If driven gear is not correct, replace with correct gear and repeat step 3).
  5. Check for proper drive gear, axle, tires and ratio adapter. If all components are correct and speedometer/odometer reads inaccurately, replace speedometer and retest system. See GAUGES  under REMOVAL & INSTALLATION. If any component is incorrect, replace with correct component and repeat step 3).
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