WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
2–2 Copyright © 1998 General Motors Corp.
DEFINITIONS AND ABBREVIATIONS
2–3. ABBREVIATIONS
A/N
A
ssembly
N
umber
Amp Unit of electrical current.
C3PS
C3 P
ressure
S
witch — Pressure switch to signal the presence or absence of pressure in
the C3 clutch-apply circuit.
COP
C
entral
O
perating
P
rocessor — Hardware protection which causes the ECU to reset if
software gets lost.
CT
C
losed
T
hrottle.
DDR
D
iagnostic
D
ata
R
eader — Diagnostic tool; most current version is the Pro-Link
®
9000
made by MicroProcessor Systems, Inc. Used to interrogate the ECU for diagnostic
information and for reprogramming I/O packages in a calibration.
DNA
D
oes
N
ot
A
dapt — Adaptive shift control is disabled.
DNS
D
O
N
OT
S
HIFT — Refers to
DO NOT SHIFT
light and
DO NOT SHIFT
diagnostic
response during which the transmission will not shift and will not respond to the Shift
Selector.
DVOM
D
igital
V
olt-
O
hm
m
eter.
ECU
E
lectronic
C
ontrol
U
nit (also commonly referred to as the “computer”).
EEPROM
E
lectronically
E
rasable
P
rogrammable
R
ead
O
nly
M
emory — This is the microchip that
contains the transmission shift calibration information. The EEPROM is soldered into the
ECU and is not removable.
IF
I
nput
F
unction — Input signal to the ECU to request a special operating mode or
condition.
LED
L
ight-
E
mitting
D
iode — Electronic device used for illumination.
MPC
M
ulti-
P
rotocol
C
artridge — Added to Pro-Link 9000
®
to do reprogramming.
NNC
N
eutral
N
o
C
lutches — Neutral commanded with no clutches applied.
NVL
N
eutral
V
ery
L
ow — The ECU has sensed turbine speed below 350 rpm. This is usually
caused by a dragging C1 or C3 clutch or a failed turbine speed sensor. When attained, the
C4 and C5 clutches are applied to lock the transmission output.
OEM
O
riginal
E
quipment
M
anufacturer — Maker of vehicle or equipment.
Ohm Unit of electrical resistance.
OF
O
utput
F
unction — Output signal from the ECU to control vehicle components (such as
PTOs, backup lights, etc.) or allow a special operating mode or condition.
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