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B/MAP
Barometric/Manifold Absolute Pressure
B+
Battery Positive Voltage - The voltage or potential of the battery positive terminal.
BAC
Bypass Air Control Valve
BARO
Barometric Pressure
BAROMETRIC (BARO) READ SOLENOID
The BARO read solenoid is a solenoid located in the MAP sensor vacuum line and provides an indication of barometric pressure (on turbocharged vehicles) to the vehicle's on-board computer for boost control.
BASE IDLE
Idle RPM when the throttle lever rests on the throttle stop and the Idle Speed Control is fully retracted and disconnected.
BAT
Battery
BATTERY
A group of two or more chemical cells connected together for the production of an electric current.
BATTERY TEMPERATURE SENSOR
The sensor is a 10K ohm thermistor (temperature-controlled variable resistor), located in the vehicle's on-board computer, which controls charging system voltage according to battery temperature (resistance decreases as temperature increases).
BATTERY VOLTAGE
The voltage measured between the two terminals of a battery.
BATTERY-HOT
Describes a circuit which receives input voltage directly from the starter relay terminal. Voltage is available whenever the battery is charged.
BC
Blower Control
BCM
Body Computer Module.
BEFORE TOP DEAD CENTER (BTDC)
Refers to crankshaft position relative to the ignition timing in degrees.
BHP
Brake Horsepower
BHS
Bimetal Heat Sensor (Ford)
BID
Breakerless Inductive Discharge (AMC)
BIMETAL
A contact arm made of two dissimilar metals, each having a different expansion rate. Heat causes bending movement of the arm to make or break a circuit.
BLM
Block Learn Multiplier (replaced with LT FUEL TRIM)
BLOWN
Describes an open (melted) fuse filament, caused by excessive current draw.
BMAP
Barometric/Manifold Absolute Pressure Sensor (Ford)
BOB
Breakout Box
BOO
Brake On-Off input to the computer.
BOOST
Condition of over-pressure (above atmospheric) in the intake manifold; caused by intake air being forced in by a turbocharger or supercharger.
BP
Barometric Pressure
BP
Barometric Pressure sensor. Used to compensate for altitude variations.
BPA
Mechanical Bypass Air
BPA
ByPass Air solenoid.
BPCSV
Bypass Control Solenoid Valve
BPP
Brake Pedal Position Switch
BPS
Back Pressure Sensor
BPT
Back-Pressure Transducer
BPV
Bypass Valve (Ford)
BPW
Brake Pulse Width
BRAKE SWITCH
Device which provides a signal to the vehicle's on-board computer to determine idle throttle position (in the event the electronic idle switch malfunctions).
BSV
Backfire Suppressor (Ford)
BTDC
Before Top Dead Center
BTS
Battery Temperature Sensor
BTSI
Brake Transmission Shift Interlock
Btu
British Thermal Unit
BUS N
Bus Negative
BUS P
Bus Positive
BV
Bowl Vent Port (Ford)
BVP
Backpressure Transducer Valve
BVSV
Bi-Metal Vent Control Valve
BVT
Backpressure Variable Transducer System (Ford)
