Transaxle Control Module (TCM)
TCM is located in control module box in engine compartment, between coolant recovery reservoir and washer fluid reservoir. TCM is in position No. 3 in module box. See Fig 1. TCM determines shift points and torque converter lock-up timing based on input signals received from various components. Components consist of mode selector switch, throttle position sensor, engine speed (RPM) sensor, vehicle speed sensor, gear position sensor, transaxle oil temperature sensor, brake switch and kickdown switch.
TCM contains a self-diagnostic system which stores a Diagnostic Trouble Code (DTC). If a transaxle problem exists, DTC(s) can be retrieved to determine transaxle problem area.