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TM 9-2320-312-24-2
Troubleshooting Section
Passwords
Active Diagnostic Code An active diagnostic code
describes a condition that is currently present in
order to alert the driver or the service technician of
System configuration parameters are protected
an abnormal parameter of engine operation. Refer
by factory passwords. Factory passwords are
to a Diagnostic Fault Code.
calculated on a computer system that is available
only to Caterpillar dealers. Since factory passwords
Aftermarket Device An aftermarket device is a
contain alphabetic characters, only the electronic
device or an accessory that is installed by the
service tool may change system configuration
customer after the vehicle is delivered.
parameters. System configuration parameters affect
the power rating family or emissions.
Air-To-Air Aftercooler An air-to-air aftercooler is
a device that is used on turbocharged engines
Customer parameters are protected by customer
in order to cool inlet air that has undergone
passwords. The customer passwords are
compression. The inlet air is cooled after the inlet
programmed by the customer. Factory passwords
air passes through the turbocharger. The inlet air
can be used to change customer passwords if
is passed through an aftercooler (heat exchanger)
customer passwords are lost.
that uses ambient air for cooling. The inlet air that
has been cooled advances to the inlet manifold.
Refer to Troubleshooting, "Customer Passwords"
and Troubleshooting, "Factory Passwords".
Alternating Current (AC) Alternating current is an
electric current that reverses direction at a regular
i01632525
interval that is reoccurring.
Glossary
American Wire Gauge (AWG) AWG is a measure
of the diameter of electrical wire. AWG is also
SMCS Code: 1000
a measure of the current carrying capacity of
electrical wire. When the AWG number is smaller,
A/C High Pressure Switch The a/c high pressure
the diameter of the wire is larger. When the AWG
switch senses refrigerant pressure in the air
number is larger, the diameter of the wire is smaller.
conditioning system. The a/c high pressure switch
opens the electrical contacts and/or the a/c high
Anti-Lock Brake System (ABS) An ABS is a brake
pressure switch closes the electrical contacts. The
system that attempts to reduce a skid during brake
opening and/or closing of the electrical contacts
operation. A power train electronic control can turn
depends on the pressure in the system in order
off the engine retarder, if necessary. Also, a power
to turn on the cooling fan. This switch may be
train electronic control can signal the engine ECM
connected to the ECM or this switch may not be
to deactivate the engine retarder.
connected to the ECM.
Atmospheric Pressure Sensor The atmospheric
ATA Data Link (American Trucking Association)
pressure sensor measures barometric pressure. The
The ATA data link is a two wire electrical connection
sensor sends a signal to the ECM. The signal is
for communication with other microprocessor based
used in engine control and in engine operation.
devices that are compatible with the American
Trucking Association standards and SAE standards
Auxiliary Retarder Relay The brakes' solenoids
(J1587 and J1708 ) such as trip recorders,
are driven by an OEM installed relay, which is driven
electronic dashboards, power train controls, and
by the ECM.
maintenance systems. The data link is also the
serial communication medium that is used for
Before Top Center (BTC) BTC is the 180 degrees
programming and troubleshooting with Caterpillar
of crankshaft rotation before the piston reaches
devices.
the top center position in the normal direction of
rotation.
Accelerator Pedal Position The accelerator pedal
position is the interpretation by the ECM of the
Boost Pressure Sensor The boost pressure sensor
signal from the accelerator pedal position sensor.
measures inlet manifold air pressure. The boost
pressure sensor sends a signal to the ECM.
Accelerator Pedal Position Sensor The accelerator
pedal position sensor is an electronic sensor
Bypass Circuit A bypass circuit is a circuit that is
that is connected to the accelerator pedal. The
used as a substitute circuit for an existing circuit. A
accelerator pedal position sensor sends a pulse
bypass circuit is typically used as a test circuit.
width modulated signal to the ECM.
Calibration Calibration is an electronic adjustment
of a sensor signal.

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