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Test J: Flash Code 4/Speed Signal Circuit Failure

  1. Check speedometer for correct operation by driving vehicle. If speedometer operates correctly, go to next step. If speedometer does not operate correctly, repair speedometer concern. See appropriate testing ANALOG INSTRUMENT PANELS - RANGER article.
  2. Turn ignition switch to OFF position. Disconnect 10-pin speed control servo harness connector. Speed control servo is located at right rear of engine compartment. Disconnect 104-pin Powertrain Control Module (PCM) harness connector. PCM is located in engine compartment, mounted on firewall. Measure resistance in Gray/Black wire between PCM harness connector terminal No. 68 (terminal No. 58 on 2.5L engines) and speed control servo harness connector terminal No. 3. See Figure . If resistance is less than 5 ohms, replace speed control servo. See REMOVAL & INSTALLATION  . If resistance is more than 5 ohms, repair open in Gray/Black wire between PCM and speed control servo.
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