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Home >> Ford >> 1997 >> Probe Base, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Cruise Control System - 2.0L A/T >> System Testing >> Set Speed Fluctuates
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Set Speed Fluctuates

  1. Check Servo Cable & Throttle Linkage For Binding

    Verify condition. Ensure engine is properly tuned. If condition occurs when cruise control is off, repair engine as required. If condition only occurs when cruise control is activated, check servo cable, throttle linkage, or throttle plate for binding or sticking. Repair as necessary.

  2. Check Vehicle Speed Sensor

    Unplug VSS connector. Measure resistance between VSS terminals. If resistance is not 200-300 ohms, replace VSS. If resistance is 200-300 ohms, check VSS circuit for open or short. See WIRING DIAGRAM . If wiring is okay, go to next step.

  3. Replace Servo

    Substitute a known-good servo. Test drive vehicle and check for proper cruise control operation. If speed still fluctuates, check PCM for stored codes. See TESTS W/CODES article in ENGINE PERFORMANCE section.
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