Manuals through 2025 now available!
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LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
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lemon-manuals.org.ua
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Transmission Control Systems: Description and Operation
Circuit Operation
The engine control module (ECM) receives inputs from switches and sensors, and controls the functions of transmission mode. The Transmission control module (TCM) also controls the POWER DRIVE , WINTER DRIVE , A/T OIL TEMP , and CHECK TRANS indicator lights and allows for diagnostic testing through the data link connector, (DLC).