AEL crankshaft positioning sensor

**Billman** · 20 October 2011, 22:31

Many Internet shops have the same sensor for all these part numbers.

**Billman** · 21 October 2011, 15:38

anyone with a removed AEL crankshaft out there? I would like to see where the timing plate gaps are compared to first cylinder.

**Billman** · 21 October 2011, 21:45

Can someone please explain me something in matter how Motronic or VEMS triggers:

The ECU sees the crankshaft pin through the G4 sensor and tha hall windows so that it knows when the 1 piston is on top. After that though the G28 sensor and the 135 tooth it knows/calculates the engine RPM and crankshaft angle correct??

Till now I just concentrated to the flywheel pin but maybe the problem is on the other sensor that reds the 135 tooth.

**UrS4boy** · 21 October 2011, 23:47

G4 crank position and G28 engine speed sender info

Originally posted by Billman

Can someone please explain me something in matter how Motronic or VEMS triggers: The ECU sees the crankshaft pin through the G4 sensor and tha hall windows so that it knows when the 1 piston is on top. After that though the G28 sensor and the 135 tooth it knows/calculates the engine RPM and crankshaft angle correct?? Till now I just concentrated to the flywheel pin but maybe the problem is on the other sensor that reds the 135 tooth.

You have it pretty much correct. Have a read on this post and see if it makes sense relative to what you said above:

quattroworld.com Forums: Crank Position (G4) and Engine Speed Sensor (G28) Info - Function , Location and PNs

http://forums.quattroworld.com/s4s6/msgs/20986.phtml

The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums

**Billman** · 22 October 2011, 09:25

Yes I have read this. Very nice post!

AEL crankshaft positioning sensor

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