Sensor, Crankshaft Position: Operation: Operation

Fig 1: Identifying Crankshaft Position Sensor And Tone Wheel (3.7L V-6)

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The engine speed and crankshaft position are provided through the CKP (Crankshaft Position) sensor (3). The sensor generates pulses which sends an input signal to the Powertrain Control Module (PCM). The PCM interprets the sensor input signal to determine the crankshaft position. The PCM then uses this information, along with other inputs, to determine injector sequence and ignition timing.

A tonewheel (targetwheel) is bolted to the engine crankshaft (1). This tonewheel has notches (2) on the outer edge.

Fig 2: Crankshaft Position Sensor

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The sensor (1) is a hall effect device combined with an internal magnet. It is also sensitive to steel within a certain distance from it.

Fig 3: Crankshaft Position Sensor Operation & Notches - 5.7L

Courtesy of CHRYSLER GROUP, LLC

The notches (3) cause a pulse to be generated when they pass under the sensor. The generated pulses are the input signal to the PCM.