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Overdrive Control Switch

NOTE: The overdrive control switch may also be known as Transmission Control Switch (TCS).

The Overdrive Control (OD) switch is mounted on end of gearshift handle. Switch sends a signal to TCM. The TCM turns on indicator light and disables 4th gear. Malfunction of switch will cause lack of 4th gear (overdrive) disable function. To diagnose inoperative TCS, see SYMPTOM TESTS  .

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