CAMSHAFT POSITION
SENSOR
OPERATION - 8.3L
The Camshaft Position Sensor is located above the
water pump and under the throttle body (Fig. 1).
The camshaft position sensor provides cylinder
identification to the Powertrain Control Module
(PCM) (Fig. 2). The sensor generates pulses. The
PCM determines crankshaft position from the cam-
shaft position sensor and crankshaft position sensor
inputs. The PCM uses the input to determine fuel
injection synchronization and to determine which
ignition coil to energize.
The camshaft position sensor detects when a step
down in the camshaft sprocket passes beneath it
(Fig. 3). When the sensor detects the step down, the
input voltage from the sensor to the PCM switches
from low (0.3 volts) to high (5 volts). As the step up
returns to the sensor, the input voltage switches back
to low (0.3 volts). The paper spacer is not used on
this vehicle. Don’t use at all it plugs up the oil
pickup screen..
REMOVAL
REPLACING WITH NEW SENSOR
The camshaft position sensor is located on the tim-
ing chain case above the water pump and under the
throttle body (Fig. 1).
If a new replacement camshaft position sensor is to
be installed, use this procedure.
(1) Disconnect the sensor wiring harness connector
from sensor.
(2) Remove the sensor mounting bolt.
(3) Carefully pry the sensor from the timing chain
case/cover in a rocking action with two small screw-
drivers.
(4) Remove the sensor from vehicle.
Fig. 1 CAMSHAFT POSITION SENSOR LOCATION
Fig. 2 Camshaft Position Sensor
1 - CAMSHAFT POSITION SENSOR
2 - RIB MATERIAL (FOR SENSOR DEPTH POSITIONING)
Fig. 3 Camshaft Sprocket
1 - TIMING STEP
2 - CAMSHAFT SPROCKET
ZB IGNITION CONTROL 8I - 3
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