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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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Comments and Suggestions:
Gene Comments: Have a 2011 base mini cooper. Crank no start. No spark. Has fuel at rail but not sure if injectors are pulsing. Had crankshaft sensor code when stalled. Replaced sensor but still no start.
October 6, 2017
shadowfax22 Comments: hello again

so i connect diagnostic when the car was on and i get fault code : Coding is not ok
High Voltage High Pressure Fuel Injector Cyl. 4
High Voltage High Pressure Fuel Injector Cyl. 3
High Voltage High Pressure Fuel Injector Cyl. 2
High Voltage High Pressure Fuel Injector Cyl. 1
Central body - FRM Legroom Module
Chassis sensor signal, front short circuit
Central Body - JBE Coupling Box

that's are all diagnostic faultis
August 21, 2017
  Followup from the Pelican Staff: Sounds like a short in the fuel injector harness. - Nick at Pelican Parts  
Shadowfax22 Comments: Dont have faulty codes, i will check al that you recommend!
Hope to figure it out whats wrong.
August 18, 2017
  Followup from the Pelican Staff: let me know what you find. - Nick at Pelican Parts  
shadowfax22 Comments: i will check, but again same problem i was curious so i went try to start it again, and again he want turn on :/
August 18, 2017
  Followup from the Pelican Staff: When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and fuel pressure, volume, quality and engine compression. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose. - Nick at Pelican Parts  
shadowfax22 Comments: I remowed baterry from car and main central for five days, today im put it back and car start 10 time normal like nothing happend, then when he was turn on i'm connected car diagnostic on it and i get two faulti codes 303E coding not ok and some code that on the front body of car i mis mass. I will let it until tomorrow and try to start it again and connect it to diagnostic.
August 18, 2017
  Followup from the Pelican Staff: Try clearing fault codes and rechecking. May be due to battery disconnection. - Nick at Pelican Parts  
shadowfax22 Comments: hello i have mini cooper r56 2007 128kw

and i have big problem, i went to gas station to put some gas in car, and after i put gas in car i cant start him 5-10 min after that he start great, it happen two times!

so after 3 months, car wont start i changed crankshaft sensor, and camshaft sensor but car still don't wont turn on, when i try to start it he is cranking but wont start.

pls help me!
August 17, 2017
  Followup from the Pelican Staff: I can't help without knowing what is missing from the system when you are trying to start it. When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and fuel pressure, volume, quality and engine compression. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 
Tony Comments: Is there an o ring for this sensor on an R56? There are for previous models but I can't see references for R56
December 7, 2016
  Followup from the Pelican Staff: No seal on R56 engine sensor. - Nick at Pelican Parts  

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Page last updated: Tue 10/17/2017 03:04:27 AM