User Manual

B
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • B – 1
A/C:
Air Conditioner
A/D:
Analog to Digital
A/F:
Air/Fuel ratio. The proportion of air and
fuel delivered to the cylinder for
combustion. For example, an A/F ratio of
14:1 denotes 14 times as much air as fuel
in the mixture. A typical ideal A/F ratio is
14.7:1.
ABS:
Anti-lock Brake System
AC Clutch Relay:
The PCM uses this relay to energize the
A/C clutch, turning the A/C system on or
off.
AC Pressure Sensor:
Measures air conditioning refrigerant
pressure and sends a voltage signal to
the PCM.
AC Pressure Switch:
A mechanical switch connected to the
A/C refrigerant line. The switch is
activated (sending a signal to the PCM)
when the A/C refrigerant pressure
becomes too low.
Actuator:
Actuators such as relays, solenoids, and
motors allow the PCM to control the
operation of vehicle systems.
Air Injection Reaction (AIR) System:
An emission control system operated by
the PCM. During cold starts, an air pump
injects outside air into the exhaust
manifold to help burn hot exhaust gases.
This reduces pollution and speeds
warm-up of oxygen sensors and catalytic
converters. After the engine is warm, the
air will either be “dumped” back to the
atmosphere (or into the air cleaner
assembly) or sent to the catalytic
converter.
APP:
Acceleration Pedal Position (Sensor)
ASR:
Acceleration Slip Regulation
Bank 1:
The standard way of referring to the bank
of cylinders containing cylinder #1. In-line
engines have only one bank of cylinders.
Most commonly used to identify the
location of oxygen sensors. SeeO2S,
Sensor 1, Sensor 2.
Bank 2:
The standard way of referring to the bank
of cylinders opposite cylinder #1. Found
on V-6, V-8, V-10, etc. and horizontally
opposed engines. Most commonly used
to identify the location of oxygen sensors.
SeeO2S, Sensor1,Sensor 2.
BARO:
Barometric Pressure Sensor. See MAP
Sensor.
BBV:
Brake Boost Vacuum (Sensor)
BCM:
Body Control Module
Boost Control Solenoid:
A solenoid that is energized by the PCM,
in order to control supercharger boost
pressure.
Brake Switch Signal:
An input signal to the PCM indicating that
the brake pedal is being pressed. This
signal is typically used to disengage
Cruise Control systems and Torque
Converter Clutch (TCC) solenoids. See
also TCC.
CAM:
Camshaft Position Sensor. Sends a
frequency signal to the PCM in order to
synchronize fuel injector and spark plug
firing.
CAN:
Controller Area Network
CARB:
California Air Resources Board.
Governing body for emissions control in
California.
CKP REF:
Crankshaft Position Reference.
CKP:
Crankshaft Position. See CPS.
$SSHQGL[% *ORVVDU\