SSANGYONG KYRON 2010.01 Manual page 637

03-16
3650-01
Six variable bleed solenoids and four on/off solenoids are used to direct transmission fluid flow
to control the fluid pressure within the three clutches and two bands. Separate pressure
regulators are used exclusively for torque converter clutch control and main transmission line
pressure.
The TCU monitors all TCU inputs and outputs to confirm correct system operation. If a fault
occurs the TCU is able to perform default action and inform the driver of the problem through
the instrument cluster warning lights. Detailed information is available via trouble codes which
can be read with the service tool.
3) Transmission Control Monitoring System
The TCU monitors all input and outputs to identify possible failures. If a fault is detected, the
TCU takes the appropriate action to ensure the transmission maintains a safe mode of
operation, without sacrificing transmission durability or driver safety.
Supply Monitoring
▶
If the battery voltage is either too great or too low, the TCU will detect a fault condition.
▶ Solenoid Supply Monitoring
While the solenoid operating transistors are being activated, checks are run for open circuits,
shorts circuits to ground and short circuits to supply. The monitoring function evaluates the
voltage characteristics during the switch ON process checking for the above faults.
▶ Gear Ratio Monitoring
The gear ratio diagnostic checks if each gear ratio is correctly engaged. Also, following a gear
shift the diagnostic checks if the transmission has engaged the target gear within the allowed
time.
▶ Torque Converter Monitoring
The TCU checks if the torque converter can be locked correctly. If torque converter lock-up
does not occur correctly the TCU performs the appropriate fail-safe action of opening the
torque converter clutch.
4) Shift Energy Management
This function involves reducing or increasing the engine output torque during shifting. The aim
when upshifting is to reduce the energy which is dissipated in the friction elements of the
transmission. This is done by reducing the engine torque during the ratio change without
interrupting the tractive drive. This function is used for:
- Increasing the transmission service life by shortening the slipping time
- Improving the shift comfort by reducing the step change in torque caused by the gearshift
DSI M78 6-SPEED A/T
KYRON 2010.01