Transmission Control Module (TCM)
The TCM determines shift points and torque converter lock-up based on input signals received from TP sensor, TR sensor, speed sensor(s) and brake switch. The TCM controls transmission shift points and torque converter lock-up by operating electric solenoids mounted on the valve body.
The TCM contains a self-diagnostic system used for determining an electronic component failure. The TCM self-diagnostic system will store a Diagnostic Trouble Code (DTC) in TCM memory if certain electronic problems are present.
DTCs can be retrieved using Chrysler's Diagnostic Readout Box III (DRB-III) or an after-market OBD-II compatible scan tool. After repairing an electrical system problem, stored DTC must be cleared from TCM memory. The TCM may be located under instrument panel next to A/C-heater unit, or behind left side of lower finish panel (depending on manufacture date). See Fig 1 .