Reference Glossary - Actron CP9035 Insrucciones

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Section 8
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Reference
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A/C:
Air Conditioning.
A/F:
Air/Fuel ratio. This refers to the
proportion of air and fuel delivered to
the cylinder for combustion. For
example, if you have 14 times more air
than fuel (by weight) then the A/F ratio
is 14:1 (read as "fourteen to one"). The
ideal operating A/F ratio in an automo-
tive application 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:
This sensor is connected to the A/C
refrigerant line. It measures refrigerant
pressure and sends a voltage signal to
the PCM. The PCM will turn off the A/C
system (by de-energizing the A/C
Clutch Relay) to prevent compressor
damage if the pressure is too high or
low.
AC Pressure Switch:
This is 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. The PCM will turn off
the A/C system (by de-energizing the
A/C Clutch Relay) to prevent compres-
sor damage. Some vehicles have a
second switch activated when the
refrigerant pressure is too high.
Actuator:
Devices that are powered by the PCM
to control things. Actuator types include
relays, solenoids, and motors.
Actuators allow the PCM to control
8-1
Glossary
system operation.
Air Injection Reaction (AIR) System:
This is 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 convert-
ers. 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. There are several versions
of the AIR system, depending on the
vehicle.
Analog Signal:
A voltage signal which can have any
voltage reading. For example, ther-
mistors send analog signals indicating
small changes in temperature. In
contrast are digital signals, which are
either "high" or "low" with no variations
in between. Also see "Digital Signal"
definition.
BARO:
Barometric Pressure Sensor. See
"MAP Sensor" definition for full
explanation.
Boost Control Solenoid:
Used on certain supercharger-
equipped engines. This solenoid is
normally energized by the PCM,
allowing the supercharger system to
operate normally. Under high engine
speed and load conditions, the PCM
de-energizes the solenoid to reduce
boost pressure.
Brake Switch Signal:
An input signal to the PCM indicating
that the brake pedal is being pressed.
Vehicles with Cruise Control Systems
monitor the brake switch to determine
when to engage or disengage the
cruise control function. The brake
switch may also have a circuit