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Home › Ford › 1997 › Windstar Base, 3.0 U › Repair and Diagnosis › Accessories & Equipment › Cruise Control Systems › Testing › Set Speed Fluctuates

Set Speed Fluctuates

  1. Ensure engine is properly tuned. Ensure problem does not occur while driving vehicle without speed control activated. If problem occurs without speed control activated, repair engine as necessary. If problem occurs only with speed control activated, go to next step.
  2. Check for binding or sticking speed control servo cable, throttle linkage and/or throttle plate. Ensure throttle cable bracket and speed control servo bracket are not loose. Repair as necessary. If all components are okay, go to next step.
  3. Disconnect Vehicle Speed Sensor (VSS) connector. Measure resistance between terminals of VSS connector. If resistance is 200-300 ohms, check continuity between Dark Green/White wire, Pink/Orange wire or Gray/Red wire. Repair as necessary and to next step. If resistance is not 200-300 ohms, replace VSS.
  4. Substitute speed control servo with a known-good servo. Check speed control system for proper operation. If speed control system operates okay, replace speed control servo. If speed control system does not operate okay, check engine powertrain control system. See TESTS W/CODES article in ENGINE PERFORMANCE section.
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