10 TERMINOLOGY 591
Valve cover gasket – A valve cover gasket that
contains the pass through electronic wiring harness
connectors for the ICP and BCP sensors, the brake
shutoff valve, and six fuel injectors.
Variable capacitance sensor – A variable
capacitance sensor is a sensor that measures
pressure. The pressure measured is applied to a
ceramic material. The pressure forces the ceramic
material closer to a thin metal disk. This action
changes the capacitance of the sensor.
Variable Geometry Turbocharger (VGT) – The
VGT is a turbocharger with actuated vanes inside
the turbine housing. The vanes modify flow
characteristics of exhaust gases through the turbine
housing for boast pressure control at various engine
speeds and load conditions.
(VGT) control module – The VGT control module
is an electronic microprocessor that converts a pulse
width modulated signal from the ECM to control a DC
motor that controls the VGT vane position.
Ve h ic le Electronic System Program m i ng System –
The computer system used to program electronically
controlled veh icles.
Vehicle Retarder Enable/Engage – Output from the
ECMtoavehicleretarder.
Vehicle Speed Sensor (VSS) – A magnetic pickup
sensor mounted in the tail shaft housing of the
transmission, used to calculate ground speed.
Viscosity – The internal resistance to the flow of any
fluid.
Viscous fan – A fan drive that is activated when a
thermostat, sensing high air temperature, forces fluid
through a special coupling. The fluid activates the fan.
Volt (v) – A unit of electromotive force that will move
a current of one ampere through a resistance of one
Ohm.
Voltage – Electrical potential expressed in volts.
Voltage drop – Reduction in applied voltage from the
current flowing through a circuit or portion of the circuit
current multiplied b y resistance.
Voltage ignition – Voltage supplied by the ignition
switch when the key is ON.
Water In Fuel (WIF) switch – The W IF switch detects
water in the fuel.
Water supply housing (Freon bracket) – The water
supply housing (Freon Bracket) is a coolant supply
housing with a deaeration port and a connection for
cab heat.
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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