Perkins 1104E Series Troubleshooting Manual page 11

RENR2696-01
Password – A password is a group of numeric
characters or a group of alphanumeric characters
that is designed to restrict access to parameters. The
electronic system requires correct passwords in order
to change some parameters (Factory Passwords).
Refer to Troubleshooting, "Factory Passwords" for
more information.
Personality Module – This module is inside the
ECM. The module contains all the instructions
(software) for the ECM and the module contains
the performance maps for a specific engine. The
personality module may be reprogrammed through
flash programming.
Power Cycled – Power cycled happens when power
to the ECM is cycled: ON, OFF, and ON. Power
cycled refers to the action of cycling the keyswitch
from any position to the OFF position, and to the
START/RUN position.
Pulse Width Modulation (PWM) – The PWM is a
signal that consists of pulses that are of variable
width. These pulses occur at fixed intervals. The ratio
of "TIME ON" versus total "TIME OFF" can be varied.
This ratio is also referred to as a duty cycle.
Illustration 3
Rated Fuel Limit – This term indicates the maximum
allowable fuel position (longest injection pulse). This
position will produce rated power for this engine
configuration.
Reference Voltage – Reference voltage is a
regulated voltage and a steady voltage that is
supplied by the ECM to a sensor. The reference
voltage is used by the sensor to generate a signal
voltage.
Sensor – A sensor is a device that is used to detect
a change in pressure, temperature, or mechanical
movement. The information that is detected is
converted into an electrical signal.
Short Circuit – A short circuit is a condition that has
an electrical circuit that is inadvertently connected to
an undesirable point. An example of a short circuit
is a wire which rubs against a vehicle frame and
this rubbing eventually wears off the wire insulation.
Electrical contact with the frame is made and a short
circuit results.
Signal – The signal is a voltage or a waveform that
is used in order to transmit information typically from
a sensor to the ECM.
Supply Voltage – The supply voltage is a constant
voltage that is supplied to a component in order to
provide the electrical power that is required for the
component to operate. The power may be generated
by the ECM or the power may be battery voltage that
is supplied by the engine wiring.
System Configuration Parameters – System
configuration parameters are parameters that affect
emissions and/or operating characteristics of the
engine.
Throttle Position – The throttle position is the
interpretation by the ECM of the signal from the
throttle position sensor or the throttle switch.
Throttle Position Sensor – The throttle position
sensor is an electronic sensor that is connected to an
accelerator pedal or a hand lever. This sensor sends
a PWM signal to the ECM that is used to calculate
desired engine speed.
Throttle Switch – The throttle switch sends a signal
to the ECM that is used to calculate desired engine
speed.
Top Dead Center – Top dead center refers to the
crankshaft position when the engine piston position
is at the highest point of travel. The engine must be
g00284479
turned in the normal direction of rotation in order to
reach this point.
Total Tattletale – The total tattletale is the total
number of changes to all the parameters that are
stored in the ECM.
Voltage Load Protection Module ("VLPM") – The
"VLPM" monitors the voltage of the electronic system.
The "VLPM"will eliminate any high voltage conditions
that occur. The "VLPM" will protect the fuel injection
pump from any high voltage conditions that could
damage the pump.
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Troubleshooting Section