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Soot
Carbonaceous particulate matter, black in color, found in diesel exhaust. Soot
particles are extremely fine. Captured by the diesel particulate filter, their chemical
characteristics are changed by the heat to which they are exposed, turning the soot
into ash.
Variable Geometry Turbocharger (VGT)
Turbo turbine housing has moving components to control flow of exhaust gas and
build back pressure in the exhaust system for EGR flow. The VGT also performs
as an engine brake.
VGT Wheel Speed
A sensor mounted in the turbo bearing housing that detects turbine and compressor
wheel speed and relays this data to the EECU.
Vehicle Electronic Control Unit (VECU)
A microprocessor-based controller, sometimes referred to as a module, mounted in the
cab, inside the passenger-side dash panel. The VECU controls engine speed, cruise
control, accessory relay controls, idle shutdown and trip recorder functions.
Glossary 173
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