Dosing Control Unit (DCU) – The DCU controls the
injection of Diesel Exhaust Fluid (DEF) into the
exhaust gas stream.
DT, DT Connector, or Deutsch DT – This is a type
of connector that is used on the engines. The
connectors are manufactured by Deutsch .
Duty Cycle – Refer to “Pulse Width Modulation” .
Electronic Engine Control – The electronic engine
control is a complete electronic system. The
electronic engine control monitors the engine
operation under all conditions. The electronic engine
control also controls the engine operation under all
conditions.
Engine Control Module (ECM) – The ECM is the
control computer of the engine. The ECM provides
power to the electronics. The ECM monitors data that
is input from the sensors of the engine. The ECM
acts as a governor in order to control the speed and
the power of the engine.
Electronic Service Tool – The electronic service
tool allows a computer (PC) to communicate with the
ECM.
Engine Monitoring – Engine Monitoring is the part
of the electronic engine control that monitors the
sensors. This also warns the operator of detected
problems.
Engine Oil Pressure Sensor – The engine oil
pressure sensor measures engine oil pressure. The
sensor sends an electronic signal to the ECM that is
dependent on the engine oil pressure.
Engine Speed/Timing Sensor – An engine speed/
timing sensor is a hall effect switch that provides a
digital signal to the ECM. The ECM interprets this
signal as the crankshaft position and the engine
speed. Two sensors are used to provide the speed
and timing signals to the ECM. The primary sensor is
associated with the crankshaft and the secondary
sensor is associated with the camshaft.
Estimated Dynamic Timing – Estimated dynamic
timing is the estimate of the actual injection timing
that is calculated by the ECM.
Event Code – An event code may be activated in
order to indicate an abnormal engine operating
condition. These codes usually indicate a mechanical
problem instead of an electrical system problem.
Exhaust Back Pressure Regulator – The exhaust
back pressure regulator regulates the gas pressure in
the exhaust system. The valve can restrict the flow of
exhaust gases in order to increase the exhaust back
pressure. An increase in exhaust back pressure will
increase the temperature of the exhaust gases. The
increase in temperature will improve the process that
burns off the soot in the DPF.
Failure Mode Identifier (FMI) – This identifier
indicates the type of failure that is associated with the
component. The FMI has been adopted from the
SAE practice of J1587 diagnostics. The FMI follows
the parameter identifier (PID) in the descriptions of
the fault code. The descriptions of the FMIs are in the
following list.
0 – The data is valid but the data is above the normal
operational range.
1 – The data is valid but the data is below the normal
operational range.
2 – The data is erratic, intermittent, or incorrect.
3 – The voltage is above normal or the voltage is
shorted high.
4 – The voltage is below normal or the voltage is
shorted low.
5 – The current is below normal or the circuit is open.
6 – The current is above normal or the circuit is
grounded.
7 – The mechanical system is not responding
properly.
8 – There is an abnormal frequency, an abnormal
pulse width, or an abnormal time period.
9 – There has been an abnormal update.
10 – There is an abnormal rate of change.
11 – The failure mode is not identifiable.
12 – The device or the component is damaged.
13 – The device requires calibration.
14 – There is a special instruction for the device.
15 – The signal from the device is high (least severe).
16 – The signal from the device is high (moderate
severity).
17 – The signal from the device is low (least severe).
18 – The signal from the device is low (moderate
severity).
19 – There is an error in the data from the device.
31 – The device has failed and the engine has shut
down.
Flash File – This file is software that is inside the
ECM. The file contains all the instructions (software)
for the ECM and the file contains the performance
maps for a specific engine. The file may be
reprogrammed through flash programming.
Flash Programming – Flash programming is the
method of programming or updating an ECM with an
electronic service tool over the data link instead of
replacing components.
Fuel Injection Pump – This item is sometimes
referred to as the High Pressure Fuel Pump. This is a
device that supplies fuel under pressure to the fuel
76 UENR4490-01
Engine Operation
This document has been printed from SPI2. NOT FOR RESALE
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