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G L O S S A R Y
G l o w P l u g S l e e v e s
Stainless steel sleeves used to protect the glow plugs from
coolant.
G P C M G l o w P l u g C o n t r o l M o d u l e
Module which supplies power to the glow plugs and identifies
variation in current flow to the glow plugs.
I AT I n ta k e A i r Te m p e r a t u r e S e n s o r
A thermistor style sensor used to indicate air temperature
before the charge air cooler.
I C P I n j e c t i o n C o n t r o l P r e s s u r e
A variable capacitance style sensor used to indicate high
pressure oil system pressure.
I AT 2 I n ta k e A i r Te m p e r a t u r e 2 S e n s o r
A thermistor style sensor used to indicate air temperature
after passing through the charge air cooler.
I D M I n j e c t o r D r i v e r M o d u l e
An electronic unit which has the primary function of an
electronic distributor for the injectors. It also is the power
supply for the injectors.
I m p e d a n c e
A form of opposition to AC current flow measured in Ohms.
I / O I n j e c t o r Te s t
A test that can be performed using the WDS to disable one
injector at a time while watching Mfdes to determine a weak
contributing injector.
I P R I n j e c t i o n P r e s s u r e R e g u l a t o r
Controls injection oil pressure. An electrical signal to a
solenoid creates a magnetic field which applies a variable
force on a poppet to control pressure. The quantity of fuel
delivered to the combustion chamber is proportional to injec-
tion control pressure.
I V S I d l e Va l i d a t i o n S w i t c h
An on/off switch that indicates when the accelerator pedal is
in the idle position.
K O E O K e y o n E n g i n e O f f Te s t
A self-test operation that is performed with the ignition switch
in the ON position with the engine OFF.
K O E R K e y o n E n g i n e R u n n i n g Te s t
A self-test operation that is performed with the ignition switch
in the ON position and the engine RUNNING.
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L o n g L i f e E t h y l e n e G l y c o l C o o l a n t
A premium coolant, with an Ethylene Glycol base, that can be
used in a cooling system for an extended time without need-
ing to be changed. Long life coolants do not require the use
of extenders. Long life coolants can be identified by its yellow
color.
M a i n P o w e r R e l a y s
(Two) Battery power relay switches for the ECM and IDM
(modules) that are key power initiated and controlled by the
corresponding powered module.
M A P M a n i f o l d A b s o l u t e P r e s s u r e
A MAP sensor generates a digital frequency that indicates
manifold boost pressure above atmospheric pressure. The
signal is created by switching action caused by manifold
pressure of a diaphragm connected to a capacitor circuit in
the sensor. The digital frequency increases as pressure
increases. A MAP sensor has three connection: signal
return(gnd), MAP signal, and Vref.
M i s f i r e D e t e c t i o n
Uses engine RPM changes during a firing cycle to determine
a low contributing cylinder.
M o d u l a r Wa t e r P u m p
Is a water pump that uses the front cover as a housing and
only the hub and impeller are replaceable.
N o r m a l l y C l o s e d
Refers to a switch or a solenoid that is closed when no con-
trol or force is acting on it.
N o r m a l l y O p e n
Refers to a switch or a solenoid that is open when no control
or force is acting on it.
P O T P o t e n t i o m e t e r
Converts a mechanical motion to a voltage value. Most often
used to sense the position of a component. This sensor
works as a variable voltage divider. The wiper arm is
mechanically connected to the component desired to be
sensed. Potentiometers have three connections: Vref, signal
out, and ground.
P u l s e W i dt h
The length of time an actuator, such as an injector, remains
energized.
R e l a t i v e C o m p r e s s i o n Te s t
A test that can be run with the WDS to measure compression
of a cylinder relative to the other cylinders in the engine. This
test is accomplished by comparing the rpm of the engine
during each compression stroke.
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