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Pinpoint Test B - 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. Checking Vehicle Speed Sensor (VSS) & Servo

    Unplug VSS connector, located at left rear of transmission. 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. If wiring is okay, substitute a known good servo. Test drive vehicle and check for proper operation. If system is not okay, check MAP and EVP sensors.
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