Actron CP9175 OBD II AutoScanner User Manual download pdf (Page 49)

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A-1

Appendix A – Glossary

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. Ideally the 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

compressor 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 or high.

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.

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Actron CP9175 OBD II AutoScanner User Manual Page 49