Btra M74 4Wd Automatic Transmission; Description And Operation - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

3A2-2

DESCRIPTION AND OPERATION

BTRA M74 4WD AUTOMATIC
TRANSMISSION
The BTR Automotive Model 74 Four Speed Automatic
Transmission is an electronically controlled overdrive four
speed unit with a lock-up torque converter. The lock-up
torque converter results in lower engine speeds at cruise
and eliminates unnecessary slippage. These features ben-
efit the customer through improved fuel economy and noise
reduction.
Of primary significance is the Transmission Control Mo-
dule (TCM) which is a microprocessor based control
system.
Max. Power (kW)
320 160
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
Configuration
260 mm Torque
Converter-Wide
Ratio Gear Set
Splined Output for Transfer
Case
The TCM utilizes throttle position, rate of throttle open-
ing, engine speed, vehicle speed, transmission fluid
temperature, gear selector position and mode selector
inputs, and in some applications a Kickdown Switch to
control all shift feel and shift schedule aspects.
The TCM drives a single proportional solenoid multi-plexed
to three regulator valves to control all shift feel aspects.
The output pressure of this solenoid is con-trolled as a
function of transmission fluid temperature to maintain con-
sistent shift feel throughout the operating range.
Shift scheduling is highly flexible, and several indepen-
dent schedules are programmed depending on the ve-hicle.
Typically the NORMAL schedule is used to maximize fuel
economy and driveability, and a POWER schedule is used
to maximize performance. WINTER schedule is used to
facilitate starting in second gear.
Y220_3A2010
BTRA 4 AUTO TRANSMISSION
REXTON SM - 2004.4