Terminology - Navistar MaxxForce DT Diagnostic Manual

Accelerator Pedal Position
(APP) sensor
A potentiometer sensor that indicates the position of the throttle pedal.
Actuator
A device that performs work in response to an input signal.
Actuator Control
The ECM controls the actuators by applying a low-level signal (low-side driver) or a high-level signal (high
side driver). When switched on, both drivers complete a ground or power circuit to an actuator.
Aeration
The entrainment of air or combustion gas in coolant, lubricant, or fuel.
Aftercooler (Charge Air Cooler)
A heat exchanger mounted in the charge air path between the turbocharger and engine intake manifold.
The aftercooler reduces the charge air temperature by transferring heat from the charge air to a cooling
medium (usually air).
Aftertreatment Fuel Doser
(AFTFD)
A part of the Down Stream Injection (DSI) unit that sends pressurized fuel to the Aftertreatment Fuel
Injector (AFI) to inject fuel into the exhaust pipe.
Aftertreatment Fuel Injector
(AFI)
Injects fuel into the exhaust system to increase temperature of the exhaust gases.
Aftertreatment (AFT) system
A part of the exhaust system that processes engine exhaust to meet emission requirements and traps
particulate matter (soot) to prevent it from leaving the tailpipe.
Air Control Valve (ACV)
Contains the LP turbocharger wastegate control port, HP turbocharger wastegate control port, the EBPV
control port, and the TC1TOP port. Although these components are integral to the ACV, each circuit is
controlled by the ECM. The ACV controls compressed air for each control valve.
Ambient temperature
The environmental air temperature in which a unit is operating. In general, the temperature is measured in
the shade (no solar radiation) and represents the air temperature for other engine cooling performance
measurement purposes. Air entering the radiator may or may not be the same ambient due to possible
heating from other sources or recirculation. (SAE J1004 SEP81)
Ampere (amp)
The standard unit for measuring the strength of an electrical current. The flow rate of a charge in a
conductor or conducting medium of one coulomb per second. (SAE J1213 NOV82)
Analog
A continuously variable voltage.

TERMINOLOGY

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