Speed/Timing Sensors
Illustration 56 g02155463
Typical example
The primary speed/timing sensor is located on the
left-hand side of the cylinder block close to the
flywheel housing. The primary speed/timing sensor
generates a signal by detecting the movement of the
teeth that are located 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 57 g02476196
Typical example
The secondary speed/timing sensor is located on the
right-hand side of the cylinder block toward the rear
of the engine. The secondary speed/timing sensor
generates a signal that is related to the camshaft
position. The secondary speed/timing sensor detects
the movement of the teeth on the timing ring (2) for
the camshaft. 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. The secondary
speed/timing sensor is required for starting purposes.
64 UENR4490-01
Engine Operation
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