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Crankshaft Sensor Replacement
 
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Pelican Technical Article:

Crankshaft Sensor Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$130

Talent:

*****

Tools:

T25 Torx, trim panel tool, floor jack, jack stands, wheel chocks, safety glasses

Applicable Models:

R56 MINI Cooper Hatchback (2007-11)
R56 MINI Cooper S Hatchback (2007-11)

Parts Required:

Crankshaft position sensor, sealing O-ring

Hot Tip:

Work with a cool engine

Performance Gain:

Car will start and run well

Complementary Modification:

Replace camshaft sensors

The digital motor electronics (DME) engine management systems in MINI R56 vehicles uses the engine control module (ECM) to control fuel injection, ignition and other important drivetrain functions. The ECM sequentially triggers the fuel injectors to spray fuel into the intake ports and then, a split-second later, triggers the ignition coils to fire the spark plugs. This sequence of events is timed by using the crankshaft position. Using the signal from the crankshaft sensor, the ECM "knows" which cylinder is ready for fuel intake and then, later, for ignition.

The crankshaft position sensor is located below the starter motor, mounted in the engine block. The sensor reads 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 the 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 at the center rear of the engine.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability.

Vehicle models change and evolve, as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Jack up the front of your vehicle. See our tech article on jacking up your vehicle. Anytime you work under your MINI, make sure that you're wearing safety glasses or safety goggles.

The crankshaft position sensor (red arrow) is located below the starter motor, mounted in the engine block.
Figure 1

The crankshaft position sensor (red arrow) is located below the starter motor, mounted in the engine block. It's housed behind a plastic cover.

A quick way to see if your crankshaft sensor is preventing the engine from starting is to connect a MINI scan tool.
Figure 2

A quick way to see if your crankshaft sensor is preventing the engine from starting is to connect a MINI scan tool. Confirm it has current communication and idle status is active. Then check if the actual RPM (green arrow) matches the desired RPM (red arrow).

Working at the crankshaft sensor cover, using a trim panel tool, remove the center rivet (red arrows) from the cover.
Figure 3

Working at the crankshaft sensor cover, using a trim panel tool, remove the center rivet (red arrows) from the cover.

Remove the cover from the crankcase (red arrow).
Figure 4

Remove the cover from the crankcase (red arrow). This will expose the crankshaft sensor (green arrow).

Disconnect the crankshaft sensor electrical connector by pressing the release tab (green arrow) and pulling it straight off the sensor (red arrow).
Figure 5

Disconnect the crankshaft sensor electrical connector by pressing the release tab (green arrow) and pulling it straight off the sensor (red arrow).

Next, completely loosen the crankshaft sensor T25 Torx mounting fastener (red arrow).
Figure 6

Next, completely loosen the crankshaft sensor T25 Torx mounting fastener (red arrow). The fastener will not come out separate from the sensor. Once loosened the sensor will pull out with the fastener.

The fastener will not come out separate from the sensor.
Figure 7

The fastener will not come out separate from the sensor. Once loosened the sensor will pull out with the fastener. Once the fastener is loose, pull the crankshaft sensor (red arrow) out of the engine block.

Install the new sensor.
Figure 8

Install the new sensor. Be sure to align the plastic dowel on the sensor (green arrow) with the bore in the crankcase (red arrow). Torque the sensor to the engine block 5 Nm. Reconnect the electrical connector and install the shield. Start the vehicle and allow it 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.



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