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• The TCM detects the vehicle conditions and performs calculations and processing based on input information from each type of sensor and switch.
• Outputs control signals to each solenoid valve so that each type of control is optimally implemented according to the vehicle conditions.

Function Table

Control item

Main control content

Shift point control
Automatic shift control
(D position)
Driving mode
Normal mode
• Normal mode selected using drive selection
• Performs automatic shift corresponding to vehicle speed and accelerator pedal depression amount
SPORT mode
• SPORT mode selected using drive selection
• Performs automatic shifting corresponding to vehicle speed and accelerator pedal depression amount
• Lower gear is selected than while in the Normal mode
Active Adaptive Shift (AAS) mode
• Unnecessary shift up is suppressed for several seconds by maintaining the gear corresponding to the operation speed at which the accelerator pedal is released
• The optimum gear on the low vehicle-speed side is selected and shift down is executed corresponding to the operation force at which the brake pedal is depressed
• During cornering, shift up is suppressed in preparation for acceleration after cornering
• In regions of high elevation, the optimum gear is selected corresponding to the environment
• The slope is estimated in the TCM to select the appropriate gear for ascent and descent

• When SPORT mode is selected, the AAS selects a lower gear compared to when normal mode is selected, and maintains it for a longer period of time
High ATF temperature mode
• Controls engine torque when the ATF temperature is high
Low engine coolant temperature mode
• If the engine coolant temperature is low, a gear lower than when in normal mode is selected
Direct mode (with steering shift switch)
• When the steering shift switch is operated while driving with the selector lever in the D position, the gear position may temporarily switch
Manual shift control
(M position)
• When M position is selected, manual shifting is prioritized according to the driver’s shift up/shift down operation
Shift pressure control
Line pressure control
• Controls line pressure with high accuracy and fine control corresponding to engine load conditions and vehicle driving conditions
Direct electric shift control
• Performs direct, electronic control of clutch engagement pressure appropriate to engine load conditions and vehicle driving conditions
Learning control
• Learns engine performance changes and transaxle deterioration over time to optimally correct clutch engagement pressure
Torque converter clutch (TCC) control
• Based on adoption of full range TCC control, active TCC control directly after acceleration from stop
• By gradually engaging/disengaging TCC piston, shock during operation is reduced
• Implements TCC control when accelerator pedal is fully closed for improved fuel economy and emission performance
Engine-transaxle integration control
• Optimally controls engine output torque when shifting
• Calculates optimum clutch engagement pressure according to engine output torque
On-board diagnostic system
• Main part of transaxle control includes self-diagnosis function. In case of malfunction, automatic transmission warning light illuminates to alert driver, and DTC is stored in TCM
• When transaxle malfunction is determined resulting from on-board diagnostic test, system control is switched to prevent any dangerous situation while driving



Block diagram



Correlation between control and input/output parts