Actron KAL9620A - Manual (Page 32)

32 9620 Professional OBD II Scan Tool
Appendix B:Glossary & Definitions
A/C:
Air Conditioning.
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.
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.
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. See O2S, 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. See O2S, Sensor 1,Sensor 2.
BARO:
Barometric Pressure Sensor. See MAP Sensor.
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.
CARB:
California Air Resources Board. Governing body for emissions control in California.
Ckt:
Circuit