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Test P: O/D Indicator Inoperative

  1. Ensure operation of overdrive function. If overdrive functions correctly, go to next step. If overdrive does not function correctly, repair overdrive system concern. See FORD AX4S ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.
  2. Turn ignition switch to LOCK position. Connect New Generation Star (NGS) tester to Data Link Connector (DLC), located beneath instrument panel. Turn ignition switch to RUN position. Using NGS tester, select ICM WARNING LAMPS AND CHIME active command. Trigger ALL LAMPS active. Observe O/D OFF indicator light. If O/D OFF indicator light does not illuminate, go to next step. If O/D OFF indicator light illuminates, repair overdrive system concern. See FORD AX4S ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.
  3. Disconnect all instrument cluster harness connectors. Inspect for corrosion and pushed out pins. Connect all instrument cluster harness connectors, ensuring they seat correctly. Operate system and verify if concern is still present. If concern is still present, replace instrument cluster. Clear DTCs and perform instrument cluster self-test. If concern is not present, system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
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