The driver then either increases or decreases engine
speed to synchronize the shift. When engine speed
is correct, the transmission shifts automatically.
The AutoSelect system consists of the following com-
ponents.
•
The Driver Display Module, or DDM
(
Fig. 8.25
), mounted on the dashboard, indi-
cates gear position and the direction engine
rpm needs to go for the next gear engage-
ment. When the gear select lever is in the "D"
position, the display module indicates what the
driver must do to engage the next gear (decel-
erate or accelerate) by down and up arrows.
When the gear number is solid on the display,
that gear is fully engaged. When the gear num-
ber is flashing the transmission is either out of
gear, waiting for the engine and transmission
to synchronize, or the next gear engagement is
in process.
•
The Driver Command Console, or DCC
(
Fig. 8.24
), replaces the shift lever and con-
trols the transmission’s shift patterns. There
are indicators for the three forward positions:
drive, hold, and low, plus reverse and neutral
positions. Shift tone volume buttons and ser-
vice and wait lamps are also located on the
console. The gear select handle contains up-
shift and downshift buttons and a gear select
lever detent button.
•
The shifter performs shifts at the front portion
of the transmission. It preselects the shift to
Neutral and completes the gear change after
driver input.
•
The Electronic Control Unit (ECU) consists of
two controllers: a transmission ECU and a sys-
tem ECU. The transmission ECU controls all
transmission shift functions and the system
ECU manages all vehicle interfaces for trans-
mission shift functions.
•
An electronic range valve, controlled by the
transmission ECU, is used to perform range
shifts.
N
D
H
VOLUME
SERVICE
WAIT
HOLD
R
L
1
2
3
4
6
5
A
B
02/16/98
f270055
A. Console Top View
B. Select Handle Side View
1.
Shift Tone Volume
Buttons
2.
Indicator Lamps
3.
Gear Position
Indicator
4.
Upshift Button
5.
Detent Button
6.
Downshift Button
Fig. 8.24, Driver Command Console (DCC)
1
2
3
4
5
6
7
8
SOLID
SOLID
SOLID
FLASHING
FLASHING
F270056
SOLID
SOLID
A
02/25/98
B
A. Driver Display Module
B. Driver Display Module Detail
1.
Decrease Engine rpm Arrows
2.
Current Gear Position
3.
Increase Engine rpm Arrows
4.
9th Gear Engaged
5.
In 9th Gear, Preselected Toward 10th
6.
Out Of Gear, Waiting For Engine/Transmission rpm
To Synchronize
7.
Engine/Transmission rpm Synchronized, Gear
Engagement In Process
8.
10th Gear Engaged
Fig. 8.25, Driver Display Module (DDM)
Transmissions
8.28