Crankshaft Position Sensor

WARNING: This page is about a different car, the 2011 Jaguar XK and 2010 Jaguar XK. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy of JAGUAR CARS, INC.

The crankshaft position (CKP) sensor is an inductive sensor that allows the engine control module (ECM) to determine the angular position of the crankshaft and the engine speed.

The crankshaft position (CKP) sensor is installed in the rear left side of the sump body, in line with the engine drive plate. The sensor is secured with a single screw and sealed with an O-ring. A two pin electrical connector provides the interface with the engine harness.

The head of the crankshaft position (CKP) sensor faces a reluctor ring pressed into the outer circumference of the engine drive plate. The reluctor ring has a 60 minus 2 tooth pattern. There are 58 teeth at 6° intervals, with two teeth removed to provide a reference point with a centerline that is 21° before top dead center (BTDC) on cylinder 1 of bank A.

If the crankshaft position (CKP) sensor fails, the engine control module (ECM):

Uses signals from the camshaft position (CMP) sensors to determine the angular position of the crankshaft and the engine speed
Adopts a limp home mode where engine speed is limited to a maximum of 3000 rev/min.

With a failed crankshaft position (CKP) sensor, engine starts will require a long crank time while the engine control module (ECM) determines the angular position of the crankshaft.