Controls and Operating
3-32
XPI Fuel Injection System - Description
1. Engine Management System (EMS) - Receives electronic inputs
from the driver as well as from sensors that provide information elec-
tronically, such as speed, oil pressure and temperature, boost pressure
and temperature and coolant temperature. This information is used to
control both the quantity of fuel injected and the injection timing. The
EMS is programmed to control the horsepower rating, torque curve,
maximum engine speed and engine protection devices. The EMS pro-
cesses this information and sends electronic signals to the XPI Fuel
System Injectors where the precise amount of fuel is injected into the
engine.
2. XPI Fuel Injectors - The engine is equipped with extra high pressure
(XPI) injector that injects diesel fuel directly into the combustion cham-
ber. The amount of fuel injected and the beginning of injection timing is
determined by the engine control unit. Injection duration and the fuel
pressure in accumulator determine the amount of fuel which is injected
into the cylinder. The EMS sends a command pulse which activates the
injector solenoid.
NOTICE: Never apply 12 or 24 volts directly to terminals on the injector
or engine sensors as they will burn out. Before removing injectors, the
fuel passages must be blown out to prevent fuel flow from entering the
cylinder head.
may result in personal injury.
cause machine damage and
loss of control, which may
ing. Doing so can result in
while the machine is operat-
The operator of the machine
must not attempt to use or
read an SDP3 of any kind
WARNING
tant performs the diagnosis.
ing machine while the assis-
maintain control of the mov-
operator. The operator must
by a person other than the
tem diagnosis must be done
Engine or electronics sys-
WARNING
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