Transmission Control Systems: Description and Operation

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Circuit Operation
The engine or powertrain control module (ECM or PCM) receives inputs from switches and sensors, and controls the functions of transmission mode. The multi-plexed indicator control unit also controls the "POWER DRIVE" "WINTER DRIVE", "A" OIL TEMP", and "CHECK TRANS" indicator lights and allows for diagnostic testing through the data link connector, (DLC).