BMW 13627582842 Crankshaft Position Sensor

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The crankshaft position sensor, placed in the bell housing, can be accessed via the starter motor opening. Turn off the ignition before starting. Remove the Starter, and then the sensor mounting fastener, allowing sensor and dust gasket removal. Next, remove the sensor connector. For installation, insert the sensor's guide pin in the crankcase groove, using a new dust gasket. Replace bolts and route wiring as before.

The crankshaft position sensor detects crankshaft position and rotation speed. The sensor used on N55 motors can also detect direction of rotation. On N51, N52, and N54 motors this sensor is positioned in the engine block and reads a toothed wheel located on the crankshaft. On N55 motors this sensor is located in the bellhousing and uses a magnetic reluctor wheel mounted on the crankshaft flange. If the ECM does not receive a signal from the crankshaft position sensor during cranking, the engine does not start. If the OBD II system misfire detection protocol detects a catalyst damaging fault due to a malfunctioning in crankshaft position sensor, the malfunction indicator light (MIL) is illuminated. The crankshaft position sensor on N51, N52, and N54 motors is supplied 12 volts from the engine electronics fuses and ground from the ECM. It produces a 5 volt square wave signal to the ECM. N55 engines use a sensor that is supplied with a 5 volt reference signal. The sensor evaluation electronics produce a sine wave signal to the ECM from 4.1 to 5.1 volts. The crankshaft position sensor may also be referred to as engine speed I reference sensor.

The crankshaft position sensor is under the intake manifold and starter motor, on the engine block's left rear. Ensure the ignition is OFF before starting. Raise and safely support the car. Disconnect the sensor harness connector and remove the sensor from the block, catching any oil drips. To install, reverse these steps. Use a new sealing 0-ring, replace the bolt, and route the wiring as before. Clear any ECM fault codes post-installation.