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8D - 6
IGNITION SYSTEM
DESCRIPTION AND OPERATION (Continued)
Fig. 11 Timing Slots
CAMSHAFT POSITION SENSOR—2.0/2.4L
DESCRIPTION
The camshaft position sensor is mounted to the
rear of the cylinder head. The sensor also acts as a
thrust plate to control camshaft endplay (Fig. 14).
Fig. 12 Camshaft Position Sensor—2.0L SOHC
OPERATION
A target magnet attaches to the rear of the cam-
shaft and indexes to the correct position. The target
magnet has four different poles arranged in an asym-
metrical pattern. As the target magnet rotates, the
camshaft position sensor senses the change in polar-
ity (Fig. 15).
The PCM determines fuel injection synchronization
and cylinder identification from inputs provided by
the camshaft position sensor (Fig. 12) and (Fig. 13)
and crankshaft position sensor. From the two inputs,
the PCM determines crankshaft position.
The sensor input switches from high (5 volts) to
low (0.30 volts) as the target magnet rotates. When
Fig. 13 Camshaft Position Sensor—2.4L DOHC
Fig. 14 Target Magnet—Typical
the north pole of the target magnet passes under the
sensor, the output switches high. The sensor output
switches low when the south pole of the target mag-
net passes underneath.
CAMSHAFT POSITION SENSOR—2.5L
DESCRIPTION
The 2.5L engine is equipped with a camshaft
driven mechanical distributor, containing a shaft
driven distributor rotor. The distributor is also
equipped with an internal camshaft position (fuel
sync) sensor (Fig. 16). This sensor provides fuel injec-
tion synchronization and cylinder identification to
the PCM.
JA
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