DEFINITIONS AND ABBREVIATIONS

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

DEFINITIONS AND ABBREVIATIONS

23.

ABBREVIATIONS

A/N

Assembly Number

ABS

Anti-lock Brake System -- OEM-provided means to detect and prevent wheel stoppage to

enhance vehicle handling. Retarder and engine brakes will not apply when ABS is active.

Amp

Unit of electrical current.

C3PS

C3 Pressure Switch -- Pressure switch to signal the presence or absence of pressure in the

C3 clutch-apply circuit.

CAN

Controller Area Network -- A network for all SAE J1939 communications in a vehicle

(engine, transmission, ABS, etc.)

COP

Computer Operating Properly -- Hardware protection which causes the ECU to reset if

software gets lost.

Closed Throttle

Diagnostic Data Reader -- Diagnostic tool; most current version is the Pro-Link 9000

DDR

made by MicroProcessor Systems, Inc. Used to interrogate the ECU for diagnostic

information and for reprogramming I/O packages in a calibration.

DNA

Does Not Adapt -- Adaptive shift control is disabled.

DNS

DO NOT SHIFT -- Refers to the DO NOT SHIFT diagnostic response during which the

CHECK TRANS light is illuminated and the transmission will not shift and will not

respond to the Shift Selector.

DVOM

Digital volt/ohmmeter

ECU

Electronic Control Unit (also commonly referred to as the "computer")

GPI

General Purpose Input -- Input signal to the ECU to request a special operating mode or

condition.

GPO

General Purpose Output -- Output signal from the ECU to control vehicle components

(such as PTOs, backup lights, etc.) or allow a special operating mode or condition.

J1587

Engine/transmission serial data communications link.

J1939

High-speed vehicle serial data communications link.

LED

Light-Emitting Diode -- Electronic device used for illumination.

NNC

Neutral No Clutches -- Neutral commanded with no clutches applied.

NVL

Neutral Very Low -- The ECU has sensed turbine speed below 150 rpm when output

speed is below 100 rpm and engine speed is above 400 rpm when N (Neutral) was selected.

This is usually caused by a dragging C1 or C3 clutch or a failed turbine speed sensor. NVL

is attained by turning D solenoid "ON" (in addition to E solenoid) and the C4 and C5

clutches are applied to lock the transmission output.

Original Equipment Manufacturer -- Maker of vehicle or equipment.

OEM

Ohm

Unit of electrical resistance.

Over Limit or Oil Level -- For Over Limit see "". Indicates Oil Level is being displayed

on a shift selector.

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