Navistar MaxxForce DT Diagnostic Manual page 188

DIAGNOSTIC MANUAL
Diesel Oxidation Catalyst
(DOC)
A DOC is part of the diesel exhaust Aftertreatment system. DOCs are devices that use a chemical process
to break down pollutants in the exhaust stream into less harmful components. More specifically, DOCs
utilize rare metals such as palladium and platinum to reduce hydrocarbon based Soluble Organic Fraction
(SOF) and carbon monoxide content of diesel exhaust by simple oxidation. The DOC can be used during an
active regeneration to create higher exhaust temperatures, thereby reducing soot in the DPF.
Digital Multimeter (DMM)
An electronic meter that uses a digital display to indicate a measured value. Preferred for use on
microprocessor systems because it has a very high internal impedance and will not load down the circuit
being measured.
Displacement
The stroke of the piston multiplied by the area of the cylinder bore multiplied by the number of cylinders in
the engine.
Down Stream Injection (DSI)
The DSI system injects fuel into the exhaust system to increase temperature of the exhaust gases, and is
necessary for DPF regeneration.
Dual Stage Turbocharger
An assembly of two turbochargers (low-pressure and high-pressure) in series to provide a wide range of
charge air pressures efficiently.
Duty cycle
A control signal that has a controlled on/off time measurement from 0 to 100%. Normally used to control
solenoids.
EGR Cooler
A cooler that allows heat to dissipate from the exhaust gasses before they enter the intake manifold.
Engine Back Pressure Valve
(EBPV)
The ECM commands the EBPV to control the Exhaust Brake.
Engine Compression Brake
(ECB) valve
The ECB valve controls pressure entering the brake oil gallery from the high-pressure oil rail gallery. This
activates the brake actuator pistons and opens the exhaust valves.
Engine Compression Brake 1
(ECB1) solenoid
The ECB1 solenoid controls pressure entering the brake oil gallery from the high-pressure oil rail gallery.
Engine Compression Brake 2
(ECB2) solenoid
The ECB2 solenoid controls pressure entering the brake oil gallery from the high-pressure oil rail gallery.
Engine Compression Brake
Pressure (ECBP) sensor
A high-pressure sensor that provides a feedback signal to the ECM indicating brake control pressure.
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