Remote Station Operation

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.