RAM 1500 Truck 2WD V6-3.9L VIN X (1999)
Camshaft Position Sensor: Description and Operation
CAMSHAFT POSITION SENSOR
The camshaft position sensor is located in the distributor on all engines.
The sensor contains a hall effect device called a sync signal generator to generate a fuel sync signal. This sync signal generator detects a rotating
pulse ring (shutter) on the distributor shaft. The pulse ring rotates 180 degrees through the sync signal generator. Its signal is used in conjunction
with the crankshaft position sensor to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with
their respective cylinders.
When the leading edge of the pulse ring (shutter) enters the sync signal generator, the following occurs: The interruption of magnetic field causes
the voltage to switch high resulting in a sync signal of approximately 5 volts.
When the trailing edge of the pulse ring (shutter) leaves the sync signal generator, the following occurs: The change of the magnetic field causes
the sync signal voltage to switch low to 0 volts.
Camshaft Position Sensor
CAMSHAFT POSITION SENSOR-PCM INPUT
A sync signal is provide by the camshaft position sensor located in the distributor. The sync signal from this sensor works in conjunction with the
crankshaft position sensor to provide the powertrain control module (PCM) with inputs. This is done to establish and maintain correct injector
firing order.
