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Test J: O/D Off Indicator Is Never/Always On

WARNING: This page is about a different car, the 2000 Ford Mustang and 1999 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch to RUN position. If O/D OFF indicator is always illuminated, go to next step. If O/D OFF indicator is not always illuminated, go to step  3 .
  2. Turn ignition switch to OFF position. Disconnect instrument cluster harness connector C250. Turn ignition switch to RUN position. If O/D OFF indicator is not illuminated, repair transmission control switch circuit. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If O/D OFF indicator is illuminated, replace instrument cluster.
  3. Perform dealer test mode. See DEALER TEST MODE  under SELF-DIAGNOSTIC SYSTEM. If O/D OFF indicator operated properly during "bulb" portion of test, repair transmission control switch circuit. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If O/D OFF indicator did not operated properly during "bulb" portion of test, replace bulb or instrument cluster as necessary.
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