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Diagnostics
Jul. 25th, 2023 09:09 amI encountered a weird issue with the new bike (Tracer 900) while on vacation. With the key in the "off" position, the screen was displaying and had "Err" in the corner. It shouldn't have even had power. I cycled the key a bunch of times, didn't change anything.
I had looked at the wiring diagram a couple of days ago and was thinking about how it's getting power; I couldn't figure out a path. Later while standing by it I had a thought that maybe it was a bad ground back-feeding through an always-on device. So I tried the horn button to cause a load. I got a little "gnk!" from the horn and the screen reset. Did that a few times. Then I tried holding the horn button down for a few seconds, that "solved" the problem.
A while later I was on the road and had a thought; I had been charging my USB power bank via USB-C to USB-C, and the power bank can switch from load to source on that port. When I got to my destination I checked and the 12 volt acc socket was dead, and sure enough the fuse was blown. The power bank had flipped to source mode and was trying to power up the motorcycle (though only at 5 volts). I replaced the fuse and the problem returned. Dermot put a USB power reading cable on it and it showed a 5.4 volt at 0.4 amp current going to the bike.
So mystery solved!
Short term solution, I switched to USB-A to micro-B to charge the power bank. I later determined that the phone on the charger will do the same thing, the phone switches to USB OTG and provides power.
Long term solution I ordered some 50V 10A Schottky diodes and will put one in series with the ACC outlet so this can't happen in the future.
I had looked at the wiring diagram a couple of days ago and was thinking about how it's getting power; I couldn't figure out a path. Later while standing by it I had a thought that maybe it was a bad ground back-feeding through an always-on device. So I tried the horn button to cause a load. I got a little "gnk!" from the horn and the screen reset. Did that a few times. Then I tried holding the horn button down for a few seconds, that "solved" the problem.
A while later I was on the road and had a thought; I had been charging my USB power bank via USB-C to USB-C, and the power bank can switch from load to source on that port. When I got to my destination I checked and the 12 volt acc socket was dead, and sure enough the fuse was blown. The power bank had flipped to source mode and was trying to power up the motorcycle (though only at 5 volts). I replaced the fuse and the problem returned. Dermot put a USB power reading cable on it and it showed a 5.4 volt at 0.4 amp current going to the bike.
So mystery solved!
Short term solution, I switched to USB-A to micro-B to charge the power bank. I later determined that the phone on the charger will do the same thing, the phone switches to USB OTG and provides power.
Long term solution I ordered some 50V 10A Schottky diodes and will put one in series with the ACC outlet so this can't happen in the future.
