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A
Amperes
A/C
Air Conditioning
A/C CLUTCH SWITCH
Device which sends a signal to the vehicle's on-board computer to prevent engine idle speed from varying when the compressor clutch cycles. The computer activates the AIS motor to give a one-time increase in engine speed when the A/C clutch engages.
A/C CUT-OUT RELAY
Device which operates under control of the vehicle's on-board computer to prevent compressor clutch engagement under wide open throttle conditions.
A/C SWITCH
Device which sends a signal to the vehicle's on-board computer to indicate the air conditioner is operating. The computer increases engine speed to compensate for the additional load. (This signal was not used on 1984-85 EFI models).
A/CL BIMET
Air Cleaner Bi-Metal Sensor
A/CL DV
Air Cleaner Duct and Valve Vacuum Motor
A/D
Analog to Digital Converter
A/F
Air Fuel Ratio
A/T
Automatic Transmission
A4LD
Ford automatic 4 speed lock-up converter drive.
A4R70W
Automatic Overdrive Electronic Wide Ration Transmission
AAC
Auxiliary Air Control
AAV
Anti-Afterburn Valve (Mazda)
ABCV
Airbleed Control Valve (Ford)
ABS
Antilock Brake System
ABSV
Air Bypass Solenoid Valve (Mazda)
ABV
Air Bypass Valve
AC
Alternating Current
ACC
Air Conditioning Clutch
ACC
Automatic Climate Control
ACCS
Air Conditioning Cycling Switch.
ACD
Air Conditioning Demand Switch
ACON
Air Conditioning On Signal
ACP
Air Conditioning Pressure Signal
ACPSW
Air Conditioning Pressure Switch
ACR
Air Conditioning Relay
ACR4
Air Conditioning Refrigerant, Recovery, Recycling, Recharging
ACT
Air Charge Temperature sensor or signal circuit.
ACTUATION TEST MODE (ATM)
The diagnostic mode used by the vehicle's on-board computer to activate and deactivate specific output circuits to determine if they are operating properly. Outputs of this test mode are displayed as 2-digit ATM codes which identify malfunctions to a specific circuit.
ACTUATOR
A device that moves or controls another device in response to a mechanical, hydraulic, pneumatic, or electrical input.
ACV
(Thermactor) Air Control Valve.
A-D (ANALOG-DIGITAL) CONVERTER
An electronic circuit which converts an analog input to a digital output.
ADU
Analog-Digital Unit
AFC
Air Flow Control
AFM
Air Flow Meter
AFR
Air Fuel Ratio
AFS
Air Flow Sensor (Mitsubishi)
AFTER TOP DEAD CENTER
Refers to crankshaft position relative to the ignition timing in degrees.
AICV (AIR INJECTION CHECK VALVE)
One-way check valve which prevents hot exhaust gases from backing up in the hose and air pump in the event of air pump belt failure, abnormally high exhaust system pressure, or if the air hose ruptures.
AIR
Secondary air injection (formerly thermactor).
AIR BPV
Thermactor Air Bypass Valve.
AIR CHARGE TEMPERATURE SENSOR
A thermistor (temperature-controlled variable resistor) located in the intake manifold.
AIR CLEANER VACUUM DIAPHRAGM
A diaphragm, controlled by the air temperature sensor, which controls the position of the door in the air cleaner duct to allow warm or cold air into the carburetor.
Air Conditioning Clutch
Sends signal input to computer relating status of air conditioning clutch.
AIR GAP
The space between the spark plug electrodes, motor and generator armatures, field shoes, etc.
AIR RELIEF VALVE (ARV)
Device which vents excess air pump output into the engine compartment when a specified discharge pressure is reached.
AIR SWITCHING/RELIEF VALVE (ASRV)
The ASRV directs air injection to the exhaust port or downstream injection port, depending on engine operating temperature, and regulates system pressure by controlling air pump output at high engine speeds (when pressure reaches a predetermined level, some of the air pump output is vented to atmosphere. Initially air injection is directed to the exhaust ports; as the engine reaches normal operating temperature, air injection is directed to the downstream injection port for proper system operation.
AIR/FUEL (AF) MIXTURE
A ratio of the amount of air that is mixed with fuel before it is burned in the combustion chamber.
AIRB
Air Bypass Solenoid
AIRD
AIR Diverter Solenoid
AIS
Automatic Idle Speed
AIS
Air Injection System (Chrysler)
AIS (AUTOMATIC IDLE SPEED) MOTOR
Increases or decreases the size of an idle air bypass to raise or lower idle speed. The AIS motor is mounted on the throttle body assembly and is controlled by the vehicle's on-board computer.
AIV
Air Injection Valve
ALC
Automatic Level Control
ALCL
Assembly Line Communications Link (GM)
ALDL
Assembly Line Data Link
ALT
Alternator (replaced with GEN)
ALTERNATING CURRENT (AC)
An electrical current which alternates it's direction of flow at regular intervals.
AM1
Thermactor Air Management (TAB).
AM1
Air Management 1, AIR Bypass
AM2
Thermactor Air Management (TAD).
AM2
Air Management 2, AIR Diverter
AMB
Ambient
AMBIENT TEMPERATURE
Temperature of air surrounding an object.
AMMETER
A device which measures current in an electrical circuit.
AMPERAGE
The total amount of current flow in a circuit.
AMPERE
A unit of measurement to determine the current (flow of electrons) in a circuit.
AMPLIFIER
An electronic device (usually a vacuum tube or transistor) used in a circuit to increase voltage or current.
AMPLITUDE
The maximum rise and fall of a voltage signal from its average value.
ANALOG
A method of transmitting information by varying a voltage or current.
ANALOG CONTROLS
Circuits which process and/or transmit information by varying a current or voltage.
ANALOG VOLT-OHMMETER (VOM)
A device which measures voltage and resistance in an electrical circuit. Readings are displayed by a meter movement (instead of a digital display).
ANALOG-DIGITAL (A-D) CONVERTER
An electronic circuit which converts an analog input to a digital output.
ANTI-BFV
Anti-Backfire Valve.
AOD
Automatic Over Drive transmission.
AODE
Automatic Overdrive Electronic Transmission
AODE-W
Automatic Overdrive Electronic Wide (ratio transmission)
AP
Accelerator Pedal
APC
Automatic Performance Control
APS
Atmospheric Pressure Sensor (Mazda)
APS
Absolute Pressure Sensor (GM)
APT
Adjustable part Throttle
ARC
Automatic Ride Control
ARMATURE
The moveable part of an electromagnetic device; the rotating part of a generator or motor.
ARS
Automatic Restraint System
ASARC
Air Suspension Automatic Ride Control
ASD
Automatic Shutdown Relay
ASDM
Airbag System Diagnostic Module (Chrysler)
ASE
Automotive Service Excellence
ASM
Acceleration Simulation Mode
ASR
Acceleration Slip Regulation
ATC
Automatic Temperature Control
ATDC
After Top Dead Center
ATF
Automatic Transmission Fluid
ATM
Actuator Test Mode
ATMOSPHERIC PRESSURE
The pressure caused by the weight of the earth's atmosphere; equal to approximately 14.69 psi at sea level.
ATOMIZATION
To reduce a liquid to a fine spray.
ATS
Air Temperature Sensor (Chrysler)
ATX
Automatic Transaxle
AUTOMATIC SHUT-DOWN RELAY
Operates under control of the vehicle's on-board computer to supply voltage to the in-tank fuel pump, ignition coil and fuel injectors during engine cranking.
AVAILABLE VOLTAGE
The amount of voltage measured at the voltage source, or other point in a circuit, with respect to ground.
AVOM
Analog Volt/Ohm Meter.
AWD
All-Wheel Drive
AWG
American Wire Gage'
AX4S
Automatic 4-Speed Trans.
AXOD
Automatic Overdrive transaxle.
AXOD-E
Automatic Overdrive Transaxle - Electronically Controlled
