Ecumaster forum

Hey, i have a massive problem regarding my camsensor and camsync. It's a M52B28 BMW engine, completely original. The crank and camsensors should both be Hall sensors. And i have once the original wiring loom with original ecu installed on the car, and a seperate wiring loom with the ecumaster ecu. So i simply can switch between original ecu and ecumaster by changing the sensor plugs. (The car is doing its job as normal with original ecu).
First of all, i have a picture attached once with the crankshaft and once with the camshaft sensor. It shows the connection plugs to each sensor (+ - and ground). I have measuered both sensors to check volt and ground connection. So as you can see in the pic the crank sensor is fine, 5 Volt from "+" to "g" and from "-" to "g", and the ground connection is really connected to the ground (i have measured the resistance between "g" and the engine block and the result was 0 ohm)
So if you have a look at the cam sensor now it becomes all little bit tricky. I only can measure 2.5V (shouldn't it be 5V?????) between "-" and "g" connection in the camshaft connector plug. And if i measure the resistance between "g" and the engine block, the resistance is infinitely high (if i compare to crank sensor, it should be 0 ohm, what would make sense to me). But there is 0 ohm resistance between the "-" connector and the engine block. What the fuck is goin on here? If i compare with the crank sensor, it's all really messed up, all completely different but both are hall sensors. Or is the cam sensor anything special like no hall and no vr? Anyone here who has the M52 Engine running with ecumaster (M50 Engine have different sensors).
I measuered all these values with the original ecu connected, because car is running fine in original condition.

If i connect the ecumaster now, crank is exactly the same. But ecumaster powers up the cam sensor with 5v between "+" and "g" and between "-" and "g" (same like crank). So the reslult is i have no cam signal. (You can see it in the second pic, there is a scope).
I would say ecumaster is doing its job right, but does anyone know whats the problem with the cam sensor, or how to connect the cam sensor? I am about to getting crazy with this sensor, i tried to figure out the problem for 4 days now but i have no clue where's the problem.
And because of that missing camsync i never made the engine running.

maybe u wanna see this stuff here as well:

BMW hall effect sensors require a constant 12v supply and a sesnor ground. Then a 5v signal is provided from the ecu on the 3rd signal wire via a pullup resistor and when the sensor is in the proximity of a metal tooth the 5v signal is pulled to ground... producing the required square wave signal.

we have a couple m54 engines running very well they also have hall sensors on both cam and crank

edit: m52 have a 3 wire VR sensor on the cam!!

thanks a lot RHD now i am not that confuesed any more =D . Well thats pretty interesting i thought the cam sensor is hall as well. Do you know how to connect the sensor then? i suppose 64 is ground, 65 is connected to +12v and 43 is connected to emu device?
By the way, why does this vr sensor have 3 wires? I only know about vr sensors with 2 wires for + and -

VR sensors definitely should not be powered!

I have no idea why they use double VR sensor so i would just connect 64 to sensor ground and 65 to signal and leave 43 with no connection. It looks like you can probably use either 43 or 65 for the signal, so if you have trouble with one try the other.

In fact you might be able to use any two of the wires connected to sensor ground and signal but someone might want to correct me on that one?

Oke thanks i will try that next weekend. I tried like i described it in my previous post, but that was not working
I hope i will get the camsync running then

One more question: Do you get a cam signal while cranking with the vr sensor, or is the "signal" coming from the sensor to weak to be displayed in the scope?
And needs the trigger edge set to the correct edge to get a signal displayed in the scope, or will there also be a signal shown even if the edge is setted wrong? Just in case there will be no signal while cranking, how will it work then if i have setted full sequential ignition and injection. I can remember in the manual it says full sequential only works with cam sync. And if i don't have a signal while cranking, there will be no cam sync??

Camsynk always shows on cranking

Hey, i just wanna give you a quick update. Finally solved the problem. But with a Hall sensor from the M54 Engine.
It is not possible to get the ecumaster running with the stock m52 cam sensor. This sensor is not a Hall nor a VR sensor, nor a 3-Wire VR Sensor. It is something completeley different. I found out that this sensor is working with a frequency that is supplied by the ecu and is counting the tooth in any mysterious way. So if there is anyone else out there trying to get the engine running with stock cam sensor: forget it, use the m54 cam sensor.

glad you have found an easy solution but i dont believe that the sensor will not be read by the EMU, there are only VR or Hall/optical type of sensors so it will just be a matter of how it is configured or connected... maybe it does use a voltage to create the magnetic core? but one way or another im sure it will be possible to use

I would be very interested to hear from someone who knows more about this particular sensor!.... anyone??