BMW 13627582842 Crankshaft Position Sensor

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The crankshaft position sensor is located within the bell housing and reads a magnetic reluctor wheel mounted on the crankshaft flange. The sensor can be accessed through the starter motor opening. Ensure the ignition is OFF before starting. The first step is to remove the Starter, followed by the removal of the sensor mounting fastener. This allows for the removal of the sensor from the cylinder block with the dust gasket. Next, remove the sensor connector mounting fastener and remove the sensor connector from the cylinder block. Installation is simply the reverse of removal, with the guide pin of the sensor being inserted in the guiding groove of the crankcase. Remember to use a new sealing dust gasket when installing the sensor, replace the mounting bolts, and ensure the wiring is routed as before. Finally, check and clear fault codes from the ECM memory.

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 located on the left rear of the engine block, underneath the intake manifold and starter motor. Before starting, ensure the ignition is OFF. You will need to raise the car and support it in a safe manner. Working underneath the starter, disconnect the crankshaft position sensor harness connector from the sensor. Then, remove the sensor mounting fastener and remove the sensor from the cylinder block. Be prepared to catch any dripping oil. To install, simply reverse the removal process. Remember to use a new sealing 0-ring when installing the sensor, replace the mounting bolt, and ensure the wiring is routed as it was before. After installation, check and clear any fault codes from the ECM memory.