Copyright © 1998 General Motors Corp. 2–3
DEFINITIONS AND ABBREVIATIONS
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
OL
O
ver
L
imit or
O
il
L
evel — For
O
ver
L
imit see “
∞
.” Indicates
O
il
L
evel is being
displayed on a shift selector.
OLS
O
il
L
evel
S
ensor — Electronic device (optional) on control module for indicating
transmission fluid level.
PCCS
P
ROM
C
alibration
C
onfigurator
S
ystem.
PCMCIA
P
ersonal
C
omputer
M
emory
C
ard
I
nternational
A
ssociation — Memory device for use
with Pro-Link
®
. Contains Allison Transmission programming and diagnostics.
PROM
P
rogrammable
R
ead
O
nly
M
emory.
PTO
P
ower
T
ake
o
ff.
PWM Solenoid
P
ulse
W
idth
M
odulated
Solenoid
— Solenoids are controlled by pulse width modulation.
Solenoid control of clutch pressures is based on the solenoid’s duty cycle. Duty cycle is
determined by the ratio of solenoid’s on-time to off-time.
RMR
R
etarder
M
odulation
R
equest.
RPR
R
eturn to
P
revious
R
ange — Diagnostic response in which the transmission is
commanded to return to previously commanded range.
RSI
R
emote
S
erial
I
nterface — Communications lines between remote shift selector and the
ECU.
SCI
S
erial
C
ommunication
I
nterface — Used to transmit data and messages between the
diagnostic tool and the ECU and other systems such as electronically-controlled engines.
SOL OFF All
SOL
enoids
OFF
.
SPI
S
erial
P
eripheral
I
nterface — Connection between ECU and integral shift selector.
TID
T
rans
ID
— A feature which allows the ECU to know the transmission configuration and
provide the corresponding calibration required.
TPS
T
hrottle
P
osition
S
ensor — Potentiometer for signaling the position of the engine fuel
control lever.
V
V
ersion — Abbreviation used in describing ECU software level.
VDC
V
olts
D
irect
C
urrent (DC).
VIM
V
ehicle
I
nterface
M
odule — A watertight box containing relays and fuses — interfaces
the transmission electronic control system with components on the vehicle.
VIW
V
ehicle
Interface Wiring — Interfaces ECU programmed input and output functions with
the vehicle wiring. Also contains the Serial Communications Interface.
2–3. ABBREVIATIONS (cont’d)
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