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Home >> Cadillac >> 1987 >> Allante F7/ME9 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Theory & Operation >> Computerized Engine Controls >> Input Devices >> Fourth Gear Switch

Fourth Gear Switch

The fourth gear switch is a normally closed switch in transmission that opens when fourth gear oil is applied. The fourth gear switch grounds fourth gear input when transmission is not in fourth gear (0 volts at ECM).