Description And Operation: 2.9L

DESCRIPTION 

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There are two Camshaft Position Sensors (CMP) per bank.

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The CMP on both banks overlook phonic wheels on the camshafts.

Courtesy of CHRYSLER GROUP, LLC

Courtesy of CHRYSLER GROUP, LLC

The diagram shows the sensor signal as a function of rotation angle α. With this reference system, the square wave will always have the same width, independently of the rotation speed. With the measuring equipment of technical assistance, the sensor signal is detected based on time. In this case, the wave width varies as the rotation speed varies (the faster the rotation speed, the smaller the square wave width).

Courtesy of CHRYSLER GROUP, LLC

Primary Powertrain Control Module (PCM) wiring diagram with CMP sensor.

Courtesy of CHRYSLER GROUP, LLC

Secondary PCM wiring diagram with CMP sensor.

OPERATION 

The CMP sensor is a hall effect switch. The reluctor is made of a ferromagnetic material is attached to the camshaft. When the tooth passes the CMP sensor, an electronic signal is created. This signal is then sent to the PCM to determine Top Dead Center (TDC), and which cylinder has just entered its compression phase.