Daewoo Musso. Manual - part 247

5A-20  AUTOMATIC TRANSMISSION

OPERATOR INTERFACES

There are three operator interfaces associated with the four speed transmission.

They are:

l

The gear select lever

l

The driving mode selector

l

The indicator light

These operator interfaces are described below.

GEAR SELECT LEVER OPERATION

The transmission uses a conventional selector lever. The selector lever can be moved from one position to another
within the staggered configuration of the selector lever gate to positively indicate the gear -selection as shown on
figure 2.1. For information about the gear selections available refer to table 2.1.

Figure 2.1 - Typical Gear Selector and Mode Switch

AUTOMATIC TRANSMISSION  5A-21

Downshift Type

RANGE ‘1’ (MANUAL ‘1’):

RANGE ‘2’ (MANUAL ‘2’):

RANGE ‘3’ (MANUAL ‘3’):

RANGE ‘D’ (DRIVE):

RANGE ‘N’ (NEUTRAL):

RANGE ‘R’ (REVERSE):

RANGE ‘P’ (PARK):

Inhibited Above

First gear operation only with inhibited engagement as a function of vehicle

speed. Engine braking is applied with reduced throttle.

First and second gear operation with inhibited engagement of second gear, as

a function of vehicle speed. Engine braking is applied with reduced throttle.

First, second and third gear operation with an inhibited third gear engagement

at high vehicle speed. Refer to the vehicle owner’s manual.

Engine braking is applied with reduced throttle.

First, second, third and fourth gear operation. First to second (1-2), first to third

(1-3), second to third (2-3), second to fourth (2-4), third to fourth (3-4), fourth

to third (4-3), fourth to second (4-2), third to second (3-2), third to first (3-1)

and second to first (2-1), shifts are all available as a function of vehicle speed,

throttle position and the time rate of change of the throttle position (forced

downshift). Lockup clutch may be enabled in 3rd and 4th gears depending on

vehicle type. Refer to the owner’s manual.

Rear band applied only, with inhibited engagement as a function of vehicle

speed, engine speed and throttle position. The inhibitor switch allows the en-

gine to start.

Reverse gear operation, with inhibitor engagement as a function of vehicle

speed, engine speed and throttle position. The inhibitor switch enables reverse

lamp operation.

Rear band applied only, with inhibited engagement as a function of vehicle

speed, engine speed and throttle position. The transmission output shaft is

locked. The inhibitor switch allows the engine to start.

Table 2.1 - Gear Selections

DRIVING MODE SELECTOR

The driving mode selector consists of a mode  selection switch and indicator light. The driving mode selector is
located on the centre console. See figure 2,1.

The schedules available to be selected vary with vehicle types. Typically the driver should have the option to select
between ‘NORMAL’ , ‘POWER’ or ‘WINTER’ modes.

When ‘NORMAL’ mode is selected upshifts will occur to maximise fuel economy and the indicator lights remain
extinguished. When ‘POWER’ mode is selected upshifts will occur to give maximum performance and the ‘POWER’
mode indicator light is switched on. When ‘WINTER’ mode is selected, starting at second gear is facilitated, the
‘WINTER’ mode indicator light is switched on and the ‘POWER’ mode indicator light is switched off.

Refer to the vehicle owner’s manual for specific modes for each vehicle type.

5A-22  AUTOMATIC TRANSMISSION

CONTROL SYSTEMS

GENERAL

There are two control systems associated with the transmission. The electronic control system monitors vehicle
parameters and adjusts the transmission performance. The hydraulic control system implements the electronic control
system commands.

ELECTRONIC CONTROL SYSTEM

The electronic control system is comprised of sensors, a TCU and seven solenoids. The TCU reads the inputs, and
under software control activates the outputs according to values stored in read only memory (ROM).

The TCU controls the hydraulic control system. This control is via the hydraulic valve body, which contains seven
electro-magnetic solenoids. Six of the seven solenoids are used to control the line pressure, operate the shift valves
and the torque converter lock-up clutch, and to turn on and off the two regulator valves (The two regulator valves
control the shift feel.).

The seventh solenoid is the proportional or variable pressure solenoid (VPS) which works with the two regulator
valves to control shift feel.

Figure 3.1 details a typical TCU control system schematic.

The individual component locations, operation and specifications which make up the electronic control subsystem
are covered in this section.

Figure 3.1 - Typical TCU Control System Schematic

AUTOMATIC TRANSMISSION  5A-23

Temperature (

°

°

°

°

°

C)

-20

0

20

100

135 (Overheat Mode Threshold)

Maximum

17,287

6,616

2,723

196

85

Minimum

13,638

5,177

2,278

177

75

Resistance (Ohms)

Table 3.1 - Temperature / Resistance Characteristics

Figure 3.2 - Temperature / Resistance Characteristics