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19
TM 9-2320-312-24-2
Troubleshooting Section
T-Harness The T-Harness is a test harness that is
Remote Station Operation This is a location that
designed to connect into the vehicle harness or the
is outside of the vehicle cab. The functions such
engine harness. This connection allows a normal
as the engine speed control are typically used for
circuit operation and the connection simultaneously
some type of PTO operation that is for pumping
provides a breakout T in order to measure the
or for some other application that uses the engine
signals.
power. These functions are controlled from the
remote station.
Theft Deterrent This feature uses a four digit code
in order to prevent the engine from starting. The
Sensor The sensor is a device that is used
feature requires a password to be entered via the
to detect a change in pressure, temperature, or
CAT ID.
mechanical movement. The information that is
detected is converted into an electrical signal.
Throttle Position The ECM calculates the throttle
position from the signal of the accelerator pedal
Service Brake Pedal Position Switch This switch
position sensor. The throttle position may be used
is typically a pressure switch that is supplied and
as part of a power take-off control.
installed by the OEM. This switch is normally closed
when the brake pedal is in the released position.
Timing Calibration The timing calibration is the
Depressing the brake will open the circuit.
adjustment of an electrical signal as a means of
correcting the timing error between the crankshaft
Service Engine Soon Lamp This is sometimes
and the crankshaft position sensor.
referred to as the diagnostic lamp. The Service
Engine Soon Lamp is used to alert the operator
Torque Limit The torque limit is a programmable
of the presence of an active event by flashing a
parameter which limits the maximum torque that is
diagnostic code.
based on the programming of the parameter. An
OEM installed torque limit switch is required.
Service Program Module (SPM) The service
program module is a software program that is used
Total Tattletale The "Total Tattletale" is the total
to adapt the electronic service tool to a specific
number of changes to all the customer specified
engine application.
parameters that are stored in the ECM.
Short Circuit A short circuit is a condition that has
Transducer A transducer is a device that converts
an electrical circuit that is inadvertently connected
a mechanical signal to an electrical signal.
to an undesirable point. An example of a short
circuit is a wire which rubs against a vehicle frame
Transmission Style The "Transmission Style" is
and this rubbing eventually wears off the wire
a programmable parameter that designates the
insulation. Electrical contact with the frame is made
type of transmission in the vehicle and the various
and a short circuit results.
circuits that are connected to the ECM. The relay for
the transmission, cruise control, PTO/idle set speed,
Signal The signal is a voltage or a waveform that
and the operation of the exhaust brake are affected
is used in order to transmit information typically
by this parameter setting.
from a sensor to the ECM.
Trip Recorder The trip recorder is an after
Speed Burp A speed burp is a sudden, brief,
market device that is dedicated to recording the
unwanted change in the engine rpm.
parameters of the vehicle and the parameters of the
operating engine during the vehicle service. The
Standard SAE Diagnostic Communications Data
trip recorder is used to analyze the driving habits
Link Refer to the ATA Data Link.
and the recorder is used in order to produce the
logs of the driver.
Subsystem A subsystem that is used in this
application is a part of the electronic system that
Vehicle Speed Calibration The "Vehicle Speed
relates to a particular function. An example of a
Calibration" is a programmable parameter that is
subsystem is the throttle subsystem.
used by the ECM to convert the vehicle speed
signal into miles per hour or kilometers per hour.
Supply Voltage The supply voltage is a constant
voltage that is supplied to a component in order
Vehicle Speed Sensor The vehicle speed sensor
to provide electrical power that is required for
is an electromagnetic pickup that measures vehicle
the component to operate. The power may be
speed from the rotation of gear teeth in the drive
generated by the ECM or the power may be battery
train of the vehicle.
voltage that is supplied by the vehicle wiring.
System Configuration Parameters System
configuration parameters are parameters that affect
the power rating family or emissions.

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