Tcu (Transmission Control Unit) - SSANGYONG Kyron Repair Manual

99
3650

TCU (Transmission Control Unit)

Function
TCU controls the gear groups according to the driving conditions. It receives the driving data from many sensors and
switches as input signals. It is also connected with ECU, HECU, instrument panel and selector lever control unit.
TCU
1. Shifting Method
Basic shift operation includes up-shift and down-shift for all gear groups. The shift control unit determines driving
resistance, accelerator pedal position, vehicle speed and some parameters (road surface condition, up hill and down
hill gradients, trailer driving conditions, catalytic converter conditions, driving habits and automatic transmission oil
temperature) to select a shift gear.
2. Down Shift
When engine speed increases excessively, the down shift does not occur. To get an engine brake effect during
downhill driving, the current gear is maintained in speed control mode.
3. Engine RPM Adjustment
During shifting, the engine torque is reduced to optimize the shift operation by delaying the ignition time.
4. Lock-Up Clutch Control
The lockup clutch in torque converter is activated in 3rd, 4th and 5th gear and operates in sequence via PWM
solenoid valve.
5. Others
The transmission is automatically controlled to compensate durability and wear.
The shift control values such as shifting point, shifting time, pressure during shifting, and lockup clutch control are
permanently saved and the diagnosis is partially available.
AUTO TRANSMISSION
CHANGED BY
EFFECTIVE DATE KYRON SM - 2005.09
AFFECTED VIN