Illustration 153 g03796519
Typical examples of the sensor locations
(1) Primary speed/timing sensor (2) Secondary speed/timing sensor
Illustration 154 g03796527
Speed/timing sensor
(1) 8 VDC Supply
(2) Signal
The engine uses two engine speed/timing sensors.
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.
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.
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 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.
During normal operation, the secondary speed/timing
sensor is used to determine the cycle that the engine
is on. When the timing has been established, the
primary speed/timing sensor is then used to
determine the engine speed and the angular position.
The loss of signal to the primary sensor and/or the
secondary sensor will result in one of the following
faults:
• The engine will continue to run when only one
sensor signal is present from either the primary
sensor or the secondary sensor.
UENR4469-36 433
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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