Actron CP9035 Insrucciones página 45

Digital Volt Meter. An instrument using a
numeric readout to display measured
voltage values as opposed to a moving
needle on a gauge face. Usually the
instrument has other measuring
capabilities, such as resistance and
current, and may be called a Digital
Multi-Meter (DMM). Most DVMs have 10
Megaohm input impedance. This
means the circuit under test will not be
electronically disturbed when the DVM
is connected for a measurement.
ECT:
Engine Coolant Sensor.
EFI:
Electronic Fuel Injection. A term applied
to any system where a computer
controls fuel delivery to the engine by
using fuel injectors.
EGR:
Exhaust Gas Recirculation. The EGR
system recirculates exhaust gases
back into the intake manifold to reduce
NOx emissions. The EGR valve
controls the flow of exhaust gases
back into the intake manifold. Some
EGR valves are operated with a
vacuum signal while others are
electrically controlled. The amount of
EGR valve opening determines the flow
through the valve. EGR Recirculation is
only used during warm engine cruise
conditions. EGR flow at other times
can cause stalling or no starts. There
are many different types of EGR
systems controlled by the PCM.
Engine Parameters:
This is the translated information that is
displayed on the scan tool screen.
Parameters will include the information
inputs and the output information from
the PCM. Engine Parameters are often
referred to as "PIDs."
ESC:
Electronic Spark Control. This is an
ignition system function that works on
vehicles having a knock sensor
mounted on the engine block. The
REFERENCE GLOSSARY
knock sensor is wired to circuitry in a
separate module (early version) or
inside the PCM (later versions). If the
sensor detects engine knock, the ESC
function alerts the PCM that will
immediately retard the spark to
eliminate the knocking condition.
EST:
Electronic Spark Timing. An ignition
system where the PCM controls the
spark advance timing. A signal called
EST goes from the PCM to the ignition
module that fires the spark coil. The
PCM determines optimum spark timing
from sensor information — engine
speed, throttle position, coolant
temperature, engine load, vehicle
speed, Park/Neutral switch position,
and knock sensor condition.
EVAP:
Evaporative Emissions System.
EVRV:
Electronic Vacuum Regulator Valve.
This actuator is controlled by the PCM
and is used to control the amount of
vacuum applied to a vacuum-operated
device.
Fuel Injector:
An electronically controlled flow valve.
Fuel injectors are connected to a
pressurized fuel supply (fuel pressure
is created by a fuel pump). No flow
occurs when the injector is off (not
energized). When the injector is
energized, it opens fully, allowing fuel to
flow. The PCM controls fuel delivery by
varying the amount of time the injector
solenoids are turned on.
Fuel Pump Relay:
The PCM energizes this relay to apply
power to the vehicle fuel pump. For
safety reasons, the PCM removes
power from the fuel pump when ignition
signals are not present.
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