SSANGYONG KYRON 2010.01 Manual page 560

01-12
3410-01
3) TCU Inputs
To function correctly, the TCU requires engine speed, vehicle speed, transmission fluid
temperature, throttle position, gear position and Kickdown Switch inputs to determine the
variable pressure solenoid current ramp and on/off solenoid states. This ensures the correct
gear selection and shift feel for all driving conditions.
The inputs required by the TCU are as follows :
- Engine Speed The engine speed signal is derived from the Controller Area Network (CAN) via
Engine Control Module (ECM).
- Vehicle Speed The vehicle speed sensor, which is located in the transfer case, sends the
output shaft speed signal to the Engine Control Module (ECM). The information is then
transferred to the TCU via the CAN.
- Transmission Fluid Temperature The transmission fluid temperature sensor is a thermistor
located in the solenoid wiring loom within the valve body of the transmission. This sensor is a
typical Negative Temperature Coefficient (NTC) resistor with low temperatures producing a
high resistance and high temperatures producing a low resistance.
If the transmission fluid temperature exceeds 135°C (275°F), the TCU will impose converter
lock-up at lower vehicle speeds and in some vehicles flashes the mode indicator light.
This results in maximum oil flow through the external oil cooler and eliminates slippage in the
torque converter. Both these actions combine to reduce the oil temperature in the transmission.
ION 4-SPEED
KYRON 2010.01