K Tahoe 4WD V8-4.8L VIN V (2000)
Camshaft Position Sensor: Description and Operation
Camshaft Position Sensor (CMP)
The Camshaft Position (CMP) 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 CMP 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 sensors internal circuitry detects this and produces a signal which the
PCM reads. The PCM uses this 1x signal in combination with the CKP sensor 24X signal in order to determine the crankshaft position and stroke. This
diagnostic for the CMP sensor checks for a loss of CMP 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
