Speeduino

I am trying to determine if the cam sensor on an '06 r1 is VR or hall effect.

At first I thought hall effect because it's 3 wire. But then I found out that some VR sensors are 3 wire and you need to test resistance in both directions to be sure.

So results of testing I only have 2 wires with any continuity at all, 33.46 kohms in one direction and 33.56 kohms in the other. Both readings very stable.

As far as I understand resistance should be exactly the same both ways on a VR sensors and more in the range of 1 kohms not 33. So now I'm thinking maybe it is hall effect but I'm still unsure because of how similar the resistance is.

If anyone could tell me with more certainty VR or hall, or perhaps knows of another test to determine what I've got that would be much appreciated.

I also measured the crank position sensor out of curiosity which is a 2 wire sensor and I get
0.437 kohms both directions every time.

Set your meter to low volts, and see if those wires produce a small voltage when you stick or remove the sensor to something steel or iron. Yes = VR.

Otherwise, a common method is to find the wiring diagrams for a car that used it, for whether the sensor received (+) and (-) power = Hall, or no power = VR. Diagrams also provide the correct wiring connections.

PSIG wrote: ↑Fri Sep 20, 2024 3:10 am Set your meter to low volts, and see if those wires produce a small voltage when you stick or remove the sensor to something steel or iron. Yes = VR.

Otherwise, a common method is to find the wiring diagrams for a car that used it, for whether the sensor received (+) and (-) power = Hall, or no power = VR. Diagrams also provide the correct wiring connections.

I tested the voltage as you suggested and it seems to definitely not be a VR sensors. I tested all the different combinations in both directions and got nothing when introducing a piece of steel. There was some existing voltage when one of the pins was connected to either of the others but still no change with the steel.

I tested the 2 wire crank sensor for contrast and got an obvious voltage. So I'm pretty sure at this point that it's a hall effect sensor.

As for the wiring diagram, the one I found doesn't show the pinout for the ECU so it's a little hard to interpret. But like I said I think I got what I needed from the voltage test

Thanks a lot for your insight, It's been very helpful!

I tested the 2 wire crank sensor for contrast and got an obvious voltage. So I'm pretty sure at this point that it's a hall effect sensor.

2 wire suggest VR ...

Sorry I worded that very badly. I was testing the crank sensor because I knew it was a VR sensor because it has only 2 wires. I just tested it to see if and how it was different from the 3 wire cam sensor which I wasn't sure about. I was referring to the cam sensor when I said hall effect sensor. I hope that's as clear as mud.

So I thought I was done messing around with this sensor, but it looks like I am not. I recently finished wiring the r1 engine to the Speeduino, but when I went to crank it I got nothing, so I used the high speed data logger to see what was happening. The data logger shows the signal from the (VR) crank sensor but nothing for the (hall) cam sensor.

Jumpers are set to direct and pull up, and I went through the wiring with a fine tooth comb(and a volt meter) but found nothing problematic. So I turned my attention to the sensor. With the Speeduino on and supplying 5v I put my volt meter on ground, and the sensor signal but I got no change in voltage when placing the sensor on a piece of steel. So at first glance it looks like a bad sensor. Maybe, but I'm not totally sure because the engine did run not too long ago on the stock ECU. Unfortunately this was stolen so I can't test with that.

Is there anyone out there smarter than I who might have an Idea of what is going on? Is there a type of hall sensor that might behave in this way? Or is it definitely broken? Is it possible I am testing the sensor wrong and the problem is elsewhere?
Not totally sure what to ask but hopefully someone knows how to answer

link to bikes manual. wiring diagram on last page. sensor in question is number 35. in case anyone is interested.
https://www.veloxracing.com/downloads/m ... g2xUbTagII

From the diagram, I can see the center pin signal wire to the ECM, making the other two the common supply wires + or –. It shouldn't be too hard to figure those out with a 5V power source (assuming it's 5V ). Some sensors only ground, others high output and ground, etc. So, it may not need a pullup. See how it acts with the meter, so you know if you need a pullup or not. Good luck!

PSIG wrote: ↑Fri Mar 07, 2025 9:00 pm From the diagram, I can see the center pin signal wire to the ECM, making the other two the common supply wires + or –. It shouldn't be too hard to figure those out with a 5V power source (assuming it's 5V ). Some sensors only ground, others high output and ground, etc. So, it may not need a pullup. See how it acts with the meter, so you know if you need a pullup or not. Good luck!

I did some more investigating with the meter as you suggested. With the pull up resistor jumper off, I tested continuity between ground and signal, as well as 5v and signal wile I put the sensor on and off of a piece of steel. There seems to a clear switching between 5v and signal, but between ground and signal is switches between about 125 ohms and 0.46 k ohms.

I'm not totally sure how to interpret these readings, but I found something else by accident during my testing which I think is wrong but I'm not totally sure as this is all fairly new to me. let me explain. These are the resistance readings I got between the signal and ground wire under various conditions, but all with the sensor disconnected and out of the equation.

Speeduino powered OFF
2.4 k ohms with vr conditioner connected
2.3 M ohms without the vr conditioner connected

Speeduino powered ON
0.0 ohms with conditioner connected
2.0 M ohms without conditioner connected

Is this supposed to be like that? Or dose this mean that something is wrong with my board? The jumper is set to direct so I would assume that the conditioner should have nothing to do with the circuit.

I hope I am on the right track with my testing methodology.
And once again thank you so much for all your help!

If you have a module for the VR, then also run the Hall through it. If not, the unused module output and the Hall signal will fight each other to the processor.

PSIG wrote: ↑Sat Mar 08, 2025 9:23 pm If you have a module for the VR, then also run the Hall through it. If not, the unused module output and the Hall signal will fight each other to the processor.

Well, you have officially saved the day! Jumpers are now set to through conditioner and pull up and everything appears to be working flawlessly(just got the engine fired up this evening). Its always the one simple thing you didn't try .
thanks once again, your a life saver