Creation:03.09 — 2009 1-1-4
Description
(b) Engine Sensors
The engine sensors transmit data to the ECM describing engine dynamic
performance. The sensors allow comparison of current engine operating conditions
with specific parameters to determine the correct fuel delivery rate. Sensor inputs are
supplied for control rod position, speed, coolant temperature, and oil pressure. The
data received is used by the ECM to monitor and regulate engine performance, to
provide diagnostic information, and to activate the engine protection system.
(c) Speed Sensor.
The engine speed sensor reads a pulse wheel on the camshaft to calculate engine
speed. The ECM system provides over speed protection which retracts the control
rod to the stop position and initiates a fault indication condition.
(d)
Engine Protection Sensors.
The ECM records and displays engine fault conditions. The ECM continuously
monitors input data received from the engine sensors and illuminates the engine fault,
high coolant temperature, or low oil pressure light if a fault is detected. Automatic
engine shutdown is programmed for low oil pressure and high coolant temperature
conditions. Indicator lights on the instrument panel identify the specific fault condition.
Transient overrun conditions will not cause engine shutdown. Active and inactive
fault codes stores in the ECM’s memory can be accessed via the interface connector
on the panel using a PC loaded with factory diagnosis software. Displayed
information identifies the fault location; type of fault, engine speed and condition,
number of fault locations, frequency and fault active or passive status.
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