How A Crankshaft Position Sensor Works And Where To Find It

What Does A Crankshaft Position Sensor Do?

The crankshaft position sensor (CKP sensor or CPS) is one of several sensors that keep your engine running smoothly. It measures the position of the crankshaft (for which it is sometimes called the crank angle sensor or CAS), as well as the rotational speed of the crankshaft (for which it is sometimes called the engine speed sensor, ESS, or the RPM sensor). The crankshaft position sensor relays this information to the vehicle's onboard computer, the engine control unit (ECU). The ECU uses that info, along with inputs from other sensors, to control systems like ignition timing and fuel injection. This keeps all the parts of the engine well timed and working in concert. The crankshaft position sensor is essential to a smooth-operating engine.

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