Electronic Control System - SSANGYONG Actyon 2012.12 Manual

5. ELECTRONIC CONTROL SYSTEM

1) Overview
The transmission control unit (TCU) and its input/output networks control the operations of transmission:
- Shift timing
Line pressure
-
- Clutch pressure (shift feel)
- Torque converter clutch
In addition, the TCU receives input signals from certain transmission-related sensors and switches. The
TCU also uses these signals when determining transmission operating strategy. Using all of these input
signals, the TCU can determine when the time and conditions are right for a shift, or when to apply or
release the torque converter clutch. It will also determine the pressure needed to optimise shift feel. To
accomplish this, the TCU operates six variable bleed control solenoids and four ON/OFF solenoids to
control the operations of transmission.
2) Transmission Control Unit (TCU)
The transmission control unit (TCU) is mounted under the driver's seat and controls the operation of the
transmission.
TCU processes the analog information from the internal sensors and the digital information through CAN
communication lines. TCU monitors all the input and output signals. If there is any failure, TCU changes
the system to "Limp Home Mode" and alerts to the driver through the warning lamp on the
instrument cluster.
(1) Hard-wired (Analog) Input/Output
▶
Input/Output Data between TGS Lever and TCU
- Position and conditions of gear select lever
- Driving moded (Winter or Standard)
▶
Input/Output Data between Inhibitor and TCU
- Position of inhibitor switch
▶
Input/Output Data between Automatic Transmission and TCU
- 6 control signals for variable bleed solenoid
- 4 control signals for ON/OFF solenoid
- Transmission input speed
-
Transmission output speed
- Transmission oil temperature
- EMM (Embeded Memory Module)
▶
Input/Output Data between Self Diagnostic Connector and TCU
- Various DTC codes and TCU information
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3680-01