Evening. Took my bike for a bit of Dyno time yesterday and it ended up getting itself that nasty orange eobd light On the display. Checked the error code list and it was 36.0 for the speed sensor ( which I removed as I thought I didn't need it for racing). Put the sensor back in and cleared the orange eobd light after a mini run. My question is do you need the sensor? Can I ditch it and how can I keep the orange eobd light out if I do. This post is also available in English!
That's that then, thanks Ant. I wanted to ditch it as i did on the DD bike, thought it wasn't required as I tape up the speed anyway and if this sensor helps to indicate the speed I could get rid, anyway i'm only after the revs - I know different now!! Used your website to get the number decode, thank you!!
You can ditch the sensor with it's bracket and just plug in module that would generate equivalent signal from hall sensor to fool ecu that it receives signal from sensor. Short answer: I can do that for you free of charge, it should be easy to do. PM me for details.
It would seem strange to me that the if the ecu requires a signal from the rear wheel sensor to not show an error, then it doesn't use that signal somehow... For example, might the ecu change the mixture as speed increases to take account of the 'ram' effect from the air-tubes??
In this case, it seems that the speed from sensor taken from rear wheel sensor is not contributing to fuel adjustments in ECU. ECU does indeed change mixture from mentioned RAM effect, but not from wheel sensor but pressure sensor in airbox/intake. Calculating RAM effect from speed increase would not reliably produce contribution of raised air pressure as at certain speed you can have different pressures based on ambient air pressure (ground height) or direction of wind (wind perpendicular or in the direction of travel would have different bar value on air pressure than the one blowing directly against your direction of travel). This is of course simplified and many other factors take a role in this. I have made a prototype adapter for spjallen which I have tested on my bike couple days ago. I can confirm that I can ride the bike with 0mph or 160mph shown on speedometer clock from artificial signal and it does not change the way my 749 rides at all at 0-70mph speed I have tested it with (i.e. I am producing signal that I feed ecu from sensor connector thinking that the speed sensor produces constant Hz that emulates 20mph for example. However in reality I travel 40-70mph at variable speed on motorway and has experienced no change in fuelling or the way the bikes behaves aside from having constant 20mph digit displayed on tacho display). The way I understand this is that the speed sensor ECU error is purely for diagnostic/failed component error and not actively used by ECU for fuel mixture. Once I finish the prototyping for spjallen, I will post the schematic diagram and list of components for others so they can benefit from this mod along with the measurements and test.
The speed sensor will be detected by the ECU at key-on. If it doesn't respond then it is assumed as faulty and throws the error. This is why you get problems if you remove the speed sensor.
