C 1500 Truck 2WD V8-5.3L VIN T (1999)
Camshaft Position Sensor: Description and Operation
Camshaft Position Sensor (CMP)
The Camshaft Position sensor is mounted through the top of the engine block at the rear of the valley cover and works in conjunction with a 1x reluctor
wheel on the camshaft. The reluctor wheel is inside the engine immediately in front of the rear cam
bearing. The PCM provides a 12 volt power supply to the CMP sensor as well as a ground and a signal circuit.
The PCM uses the Camshaft Position sensor in order to determine whether a cylinder is on a firing or exhaust stroke. The reluctor wheel interrupts a
magnetic field produced by a magnet within the CMP sensor as the camshaft rotates. The CMP sensor's internal circuitry detects this and produces a
signal which the PCM reads. The PCM uses this lx signal in combination with the Crankshaft Position sensor 24X signal in order to determine the
crankshaft position and stroke. This diagnostic for the Camshaft Position sensor checks for a loss of Camshaft Position sensor signal. The PCM also
monitors the CMP sensor signal circuit for malfunctions. The following DTCs set when the PCM detects a CMP sensor that is out of the normal
operating range.
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DTC P0341 Camshaft Position Sensor (CMP) Circuit Performance.
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DTC P0342 Camshaft Position Sensor (CMP) Circuit Low Voltage.
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DTC P0343 Camshaft Position Sensor (CMP) Circuit High Voltage.
