Actron CP9035 Insrucciones página 47

load, and RPM.
Knock Sensor (KS):
This sensor is used to detect engine
detonation or "knock." When spark
knock occurs, the sensor emits a
pulsing signal. Depending on the
vehicle, this signal either goes to the
PCM or a separate ESC (Electronic
Spark Control) module. Then the spark
advance is retarded until detonation
stops. The sensor contains a piezo-
electric element and is threaded into
the engine block. Vibrating the element
generates the signal pulse. Special
construction makes the element
sensitive only to engine vibrations
associated with detonation "knocking."
Knock:
See "Detonation."
KOEO:
Key On, Engine Off. A test mode
where the PCM is active and feeding
data parameters, but the engine is not
running. Because the engine is not
running, some data parameters may
not be accurate or available in this
mode.
KOER:
Key On, Engine Running. A test mode
where the PCM is active and feeding
data parameters, and the engine is
running. Since the engine is running,
most data parameters should be
available and accurate.
LT:
Long Term fuel trim.
M/T:
Manual transmission or manual
transaxle.
MAF:
Mass Air Flow Sensor. This sensor
measures the amount of air entering
the engine using a wire or film heated
to a specific temperature. Incoming air
cools the wire. The MAF sensor sends
REFERENCE GLOSSARY
a frequency or voltage signal (depend-
ing on sensor type) to the PCM based
on the voltage required to maintain that
temperature. The signal frequency or
voltage increases when the mass of
the incoming air goes up. This gives
the PCM information required for
control of fuel delivery and spark
advance.
MAP:
Manifold Absolute Pressure Sensor.
This sensor measures manifold
vacuum or pressure and sends a
frequency or voltage signal (depending
on sensor type) to the PCM. This gives
the PCM information on engine load for
control of fuel delivery, spark advance,
and EGR flow.
MAT:
Manifold Air Temperature sensor. A
thermistor — a sensor whose resis-
tance decreases with increases in
temperature — is threaded into the
intake manifold. It sends a voltage
signal to the PCM indicating the
temperature of the incoming air. The
PCM uses this signal for fuel delivery
calculations.
MFI:
Multi-Port Fuel Injection. See "MPFI"
definition.
MIL:
Malfunction Indicator Lamp. The MIL is
also known as a Check Engine Light or
CEL..
Mode:
Refers to a type of operating condition,
such as "idle mode" or "cruise mode."
MPFI:
Multi-Port Fuel Injection. MPFI is a fuel
injection system using one (or more)
injector(s) for each cylinder. The
injectors are mounted in the intake
manifold, and fired in groups rather
than individually.
NOx:
Oxides of Nitrogen. A pollutant. The
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