I followed every recommendation I can think of in the MsExtra manual, so wiring and assembly are standard.
I use a 24-1 wheel with the original VR sensor of a Kawasaki Zx7r. The bike is fed by carburetors usually, the wheel is therefore aftermarket. If some words seem strange to you, please just assume the most likely fitting word as I'm not a native speaker.
I'm stuck trying to get a signal from the VR sensor. Well, the signal seems ok, but the MS resets after cranking a few seconds, respectively after about 20 to 40 signals from the VR sensor.
I think of it as a reset, because the connection to the MS is lost for a few seconds, and the logs "stop" the time for a few seconds and don't record any data... see picture.
The clock of the MS, displayable in TunerStudio, also resets, and there are "MARK" entries in the log files.
VR-Sensor only connected to the MS, problem even occurs when the sensor is completely removed from the motor and is being triggered by a screwdriver. Cranking makes for a 3V Signal, spinning the crankshaft by hand makes for 0,8V. Problem occurs even when spinning by hand.
Board is configured for VR (TachSel -> VRIn; TSEL -> VROut). Currently theres only the VR sensor and the voltage supply left connected.
Stuff I already tried, besides the standard procedures in the manuals:
-Checked the soldering scrupulously, redoing every even slighty questionable point. Tested for shorts on the little transistors with the very little legs.
-Starter motor shouldn't be the problem, as the problem also occurs when feeding the MS voltage by an external battery, without any contact to the bikes wiring (VR sensor and MS grounded to external battery).
Voltage shown by the MS is stable, at a minimum of 11.8 when fed by the bike's battery and cranking. 14.6V stable when fed by external battery.
Problem also occurs when NOT cranking and spinning the crankshaft with non-power tools.
-Different cables to the VR sensor. In the beginning I used to original wiring, after that a twisted-pair cable. Currently I use a 10cm long wire, with the MS right next to the sensor. I think noise in the wire is very unlikely at this point.
-As the TPS input creeps upwards all the time when the TPS isn't attached, I connected and calibrated it. No change.
-In the proto area, I built a FET-logic output circuit for 4 COPs, which I want to use in Wasted-COP (5.3.1.3 MSExtra hardware manual, successfully tested in the coil test mode). I disconnected it completely after suspecting ignition as the problem.
-Resistors of 2k and 10k between VR sensor and the MS.
It seems to me the MS might be resetting when trying to fire the coils the first time, after receiving a few valid signals. When generating irregelar or unsteady signals on purpose, the MS does not reset.
This is also the case when setting the polarity of the sensor the wrong way or screwing the potentiometers (too) far in clockwise.
Maybe someone can suggest what to test next, or if I'm even going the right direction. I guess identifying the components belonging to the VR processing circuit may also help, so I can have a look at them especially. I'm pretty much out of ideas at this point. So every bit of help is appreciated, especially as this problem seems to be quite unusual... couldn't find anything like this mentioned via Google.
Attached is a ToothLogger-log which represents the problem and the current MSQ.
