katana wrote:It may be the 3 missing teeth are the issue. As each tooth is at 22.5 deg spacing - angular distance between last tooth and first tooth is near 90 degrees so the ecu doesn't get a 'countdown' or however it works ! ! ! - i'm guessing here - you may have guessed!
Its a strange oscilloscope trace and seems to show variation in frequency (rotational speed) and amplitude (like variation in tooth / sensor height?)
Exactly what stevieturbo said. I think the voltage is 5 volt per "box" in the oscilloscope diagram.stevieturbo wrote:Trace looks normal ?
amplitude of the trace will vary with rpm and a VR sensor, hence each time as a cylinder is on compression the trace gets a little wider apart and lower amplitude.
Although the actual scope trace does look a good strong clean signal. Although there is no voltage scaling provided.
With spark plugs, it only says "attempting to synchronise" and nothing happens. So no, it does not sync and then lose again. It does sync without plugs though, and says "attempting to start" and as said before, we get the correct amount of missing teeth when the speed is higher.Alex DTA wrote:Does the ECU synchronise, and then throw lots of crank errors, then lose synch again?
Update: Somehow, without really changing anything, it's now synchronising with plugs! The crankshaft oscilloscope still says 2 teeth missing but I guess that's okay. Now we just gotta figure out the sensor position angle BTDC, then we'll try firing it up. Thanks for your help! I'll be back if we find more problems...