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M62 8-Cylinder Crankshaft Sensor Replacement
 
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Pelican Technical Article:

M62 8-Cylinder Crankshaft Sensor Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$130

Talent:

***

Tools:

16mm socket and wrench, 5mm Allen bit, flathead Phillips screwdriver

Applicable Models:

BMW X5 Sport Utility (2000-06)

Parts Required:

Crankshaft position sensor, crankshaft sensor fastener

Hot Tip:

Work with a cool engine.

Performance Gain:

Car will start and run well.

Complementary Modification:

Check engine for oil leaks from sensor bore are. Possibly rear main seal or engine valley gaskets

The crankshaft position sensor is used to synchronize engine timing for fuel and ignition control. It is located near the starter motor, mounted in the engine block. The sensors read a toothed reluctor wheel mounted to the end of the crankshaft. It then sends a signal to the DME used to identify cylinder location. If this signal is missing, for example from a faulty crankshaft sensor, then engine will not start. You can consider the signal from the crankshaft sensor the RPM signal for the DME.

In this article, I'll go over the steps involved with replacing the crankshaft position sensor. You can access the sensor from below the vehicle, working on the right side.

Jack up the front of your vehicle. See our tech article on jacking up your vehicle. Remember to wear safety glasses whenever you work under your car.

The crankshaft sensor is located on the right side of the engine, mounted in the transmission bell housing (green arrow).
Figure 1

The crankshaft sensor is located on the right side of the engine, mounted in the transmission bell housing (green arrow).

Working above the sway bar, disconnect the crankshaft sensor (yellow arrow) electrical connector (green arrow) by pressing the wire retainer and pulling it straight off the sensor.
Figure 2

Working above the sway bar, disconnect the crankshaft sensor (yellow arrow) electrical connector (green arrow) by pressing the wire retainer and pulling it straight off the sensor.

Next remove the crankshaft sensor 5mm Allen mounting fastener (green arrow).
Figure 3

Next remove the crankshaft sensor 5mm Allen mounting fastener (green arrow). There is not a lot of room, so I use a short ratchet with a short 5mm Allen bit. Once loose, unscrew the fastener and remove it from engine. Once the fastener is removed, pull the crankshaft sensor out of the engine block. Install a new sensor. Apply blue Loctite to the fastener threads. Torque the sensor to the engine block 8Nm (6 ft-lb). Reconnect the electrical connector and start the vehicle and allow to idle for about one-minute. If your check engine light was on, now is the time to clear any fault codes, and you are done.

If you want to test the sensor you can either connect a lab scope to monitor the signal it creates or measure resistance.
Figure 4

If you want to test the sensor you can either connect a lab scope to monitor the signal it creates or measure resistance. It is an A/C volt generating sensor, so the signal will be a sine wave. Resistance should be about 600 Ohms.

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Page last updated: Fri 5/26/2017 02:25:17 AM