Automatic Transmission
TRANSMISSION CONTROL MODULE (TCM)
AT-22
3. Transmission Control Module (TCM)
The TCM receives various sensor signals and determines the running conditions of the vehicle. It
then sends control signals to each solenoid according to the preset gearshift characteristic data,
lock-up operation data, and transfer clutch torque data (duty ratios) / multi-plate clutch (LSD)
torque data (duty ratios).
A: CONTROL SYSTEM
1. MPT MODELS
Control item Input signal
Shift control Ordinary shift control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Engine speed
Inhibitor switch
Power switch
Kickdown switch
ABS-in-operation control ABS signal
Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Brake switch
Hydraulic oil temperature control ATF temperature sensor
Reverse inhibiting control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Inhibitor switch
Shift pattern (Base/Power) select control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Inhibitor switch
Power switch
Hold control Inhibitor switch
Hold switch
Grade control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Brake switch
Inhibitor switch
Engine speed
Intake manifold pressure
Lock-up control Ordinary lock-up control Throttle position sensor
Rear vehicle speed sensor
Front vehicle speed sensor
Engine speed
Inhibitor switch
Hold switch
Power switch
Smooth control Throttle position sensor
Hydraulic oil temperature control ATF temperature sensor
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