Perkins 1104E - Page 25

SEBU8121 25
Operation Section
Features and Controls
g00915291
Illustration 1 7
Right side
view of the 1104 engine
Typical example of a 1104 engine
(8) Engine coolant temperature sensor
Failure of Sensors
All Senso
rs
A failure of any of the sensors may be caused by one
of the fol
lowing malfunctions:
•
Sensor output is open.
•
Sensor output is shorted to “- battery” or “+ battery”.
•
Measured
reading of the sensor is out of the
specification.
Intake Manifold Pressure Senso r
The inta
ke manifold pressure sensor provides a
signal which corresponds to the intake manifold
pressure to the ECM. The ECM can control injection
timing a
nd the amount of fuel that is injected.
When the throttle is increased and when the engine
demands more fuel, the fuel limit is controlled in order
to redu
ce overall smoke levels of the engine exhaust.
Engine Oil Pressure Sensor
The engin
e oil pressure sensor is an absolute
pressure sensor that measures the engine oil
pressure in the main oil gallery. The engine oil
pressur
e sensor detects engine oil pressure for
diagnostic purposes. The engine oil pressure sensor
sendsasignaltotheECM.
Intake Manifold Temperature
Sensor
The inta
ke manifold temperature sensor measures
the inlet air temperature. A signal is sent to the
Electronic Control Module (ECM). The intake
manifo
ld temperature sensor is also used by the
ECM to determine initiation of the Cold Start Strategy
and control for appropriate start of injection timing
while t
he engine is warming up.