User Manual

Event Codes
Event Codes are used to indicate that the ECM has
detected an abnormal engine operating condition.
The ECM will log the occurrence of the event code.
This does not indicate an electrical malfunction or an
electronic malfunction. If the temperature of the
coolant in the engine is higher than the permitted
limit, then the ECM will detect the condition. The
ECM will then log an event code for the condition.
Speed/Timing Sensors
Illustration 34 g02722354
Typical example
The crankshaft speed/timing sensor generates a
signal by detecting the movement of the teeth that
are on the crankshaft timing ring (1). The signal that
is generated by the speed/timing sensor is
transmitted to the ECM. The ECM uses the signal
from the speed/timing sensor to calculate the position
of the crankshaft. The signal is also used to
determine the engine speed.
Illustration 35 g02722355
Typical example
The camshaft speed/timing sensor generates a
signal that is related to the camshaft position. The
camshaft speed/timing sensor detects the movement
of the position wheel on the front of the camshaft (2).
The signal that is generated by the speed/timing
sensor is transmitted to the ECM. The ECM
calculates the speed and the rotational position of the
engine by using the signal.
Illustration 36 g02259713
Schematic for speed/timing sensor
40 UENR0623-02
Engine Operation
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