Transmission Control Module (TCM) Input & Output Signals

TCM uses two different type of signals. Direct input and Controller Area Network (CAN)-Bus input and output signals.

1. TCM Direct Input Signals
   
   Signals are received from shift selector lever position, kickdown switch, mode selector signal ("S" or "W"), ATF temperature, starter lock-out contact and 2 speed sensors located inside transmission.
2. TCM Direct Output Signals
   
   Signals are sent to 1-2/4-5 shift solenoid valve, 2-3 shift solenoid valve, 3-4 shift solenoid valve, Pulse Width Modulating (PWM) solenoid valve for torque converter, modulating pressure regulating solenoid valve, shift pressure regulating solenoid valve, R/P lock solenoid and starter lock-out.
3. TCM CAN-Bus Input Signals
   
   Signals are received from Anti-lock Brake System (ABS), ECM and Acceleration Slip Regulation (ASR) modules for accelerator pedal position, left and right rear wheel Vehicle Speed Sensor (VSS) signal, engine RPM, engine load, transmission overload protection recognition, engine coolant temperature, downshifting during cruise control operation, demand for 2nd gear startup, demand for shift pattern change (catalytic converter warm-up) and demand for releasing torque converter lock-up clutch.
4. TCM CAN-Bus Output Signals
   
   Signals are sent to ABS, ECM and ASR modules for conversion (internal torque calculation), engaged gear, torque converter lock-up status, transmission overload protection requirement, kickdown and limp-home mode.