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WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
FOOT PEDAL POSITION SENSORS (FPP)
Kubota fuel systems, utilize a "drive by wire"
technique, to allow the operator to accelerate the engine.
This type of technique does not use a physical
connection, between the operator foot pedal and the
throttle body. Therefore control of the engine is managed
by electrical signals, using a Foot Pedal Position Sensor
(FPP), to determine the location, or how much the pedal
is being depressed or released, which is relative to the
command, that the operator desires. The FPP is a
reference voltage sensor, therefore changing the voltage
output level up or down, indicates a different desired
position to the ECM. The ECM then changes the output
signal, to the ETB, thus changing the throttle blade
position, to correspond to the desired foot pedal
command. The FPP is generally integrated, in the foot
pedal mechanism, mounted in the operator's platform.
GASOLINE PRESSURE SENSORS (GPS)
The Gasoline Pressure Sensor (GPS) provides a
reference voltage signal to the ECM. The ECM reads the
voltage signal and determines the pressure of the
gasoline in the Fuel Pressure Manifold. The ECM uses
this value to maintain the precise amount of gasoline
pressure for injection, to maintain engine performance
and emission control. Thresholds of operation are
determined during the development of the calibrations;
these thresholds are used to provide diagnostics, of the
fuel delivery system. If the GPS output voltage is outside
the threshold, either high or low, the ECM will detect the
condition and either correct the fuel delivery, or set an
engine code, and utilize a "limp home" strategy, or shut
down the engine. The sensor is located in the Fuel
Pressure Manifold, and is serviceable as a separate
part.
GAS TEMPERATURE SENSORS (GTS)
The EControls ECM adjusts gasoline fuel delivery to
the engine, by utilizing a Gasoline Temperature Sensor
(GTS), which provides a reference voltage signal, to the
ECM. The ECM reads the voltage signal, and
determines the temperature of the gasoline, in the Fuel
Pressure Manifold, and uses this value, to correct the
precise amount of gasoline, required for injection, to
maintain engine performance, and emissions control.
Thresholds of operation are determined during the
development of the calibrations; these thresholds are
used to provide diagnostics, of the fuel delivery system.
If the GTS output voltage is outside the threshold, either
high or low, the ECM will detect the condition, and either
correct the fuel delivery, or set an engine code, and
utilize a "limp home" strategy, or shut down the engine.
The sensor is located in the Fuel Pressure Manifold, and
is serviceable as a separate part.
Figure 22: Gasoline Temperature and Pressure
Sensor
CRANKSHAFT POSITION SENSOR (CKP)
To determine the engine RPM and piston position of
number one cylinder, the ECM receives this information
from the Crankshaft Sensor. The CKP is located near the
flywheel at the rear of the engine, and is supplied by the
engine. CKPs vary in design, depending on the signal
that the sensor produces. Induction sensors produce a
sine wave signal, where as the pick-up crank position
sensor, which reads a notched metal "interrupter" ring,
on the back of the harmonic balancer, creates a square
wave pattern.
CAMSHAFT POSITION SENSOR (CMP)
The cam shaft sensor is used to determine which
stroke of the engine cycle the engine is running on for
control of the fuel and spark. The sensor is mounted at
the front of the engine (gear case side) and reads a pick
up wheel mounted internally within the engine. The pick
up wheel can be of vary design and number of pulses.
1-57
ECM SYSTEM
KiSC issued 12, 2016 A
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