Quote:
Originally Posted by DannoXYZ
It's perfectly normal start-up calibration. Unlike main human-controlled throttle-bodies, the sub-throttle-bodies are ECU controlled and DO NOT have TPS sensor.
So imagine you're the ECU and you're sitting in dark room with no idea what's going on in outside world. All have are multiple screens telling status of various sensors. One screen tells you air-temperature. Great! You know whether you should put on sweater or coat. Another screen tells you coolant-temperature. Awesome! Now you know whether you should dump in an extra +20% for cold-starting.
Same with TPS sensor, you'll know how far the human has twisted throttle and can look up appropriate fuel and ignition-advance value on 3D maps.
Now you (ECU} are in complete control of sub-throttles, but without a TPS, how would you know what position the butterflies are ? You don't!! So on start-up, you just spin stepper-motor towards closed position several times you can be sure butterflies are in closed position when engine starts. That way, if some human has messed with sub-throttles by manually manipulating it, you can be sure they're closed by spinning motor towards closed position. If butterflies are already closed, this spinning towards closed just pushes them against the stopper and causes some clicking/rattling sounds. Which is what you're hearing, perfectly normal.
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makes sense, but I thought there is a Sub-throttle sensor? there is a TPS sensor which is grey, and then the servor motor has a connector and then on top of the server motor is another sensor with a similar shape to the TPS.
What does that one do? I am getting a radiator tomorrow, so I will be attempting to start the bike and see what happens. I was just wondering what this is doing my other FI bike doesnt make that kinda sound.