I have an intermittent shifting issue. Without great detail here’s what’s going on... I have unplugged all the connectors, cleaned with compressed air and applied di-electric grease. The ES switch wires (white/blue, yellow/grey and black/red) from switch to ECU showing 4.8 - 5.0 volts when respected switch is depressed. I removed the shift motor, disassembled, cleaned, reassembled and tested - it’s working! Also removed the gear plate, cleaned and greased. Also removed the grounds under the carburetor and cleaned.
Here’s the problem... When working correctly, the orange wire at the ECU will show ground with key off. Key on the voltage jumps to 6.6v and will stay until the switch is depressed which causes the voltage to jump to 12.? and then straight back to 6.6v, sometimes - I understand the ECU has relays and the 12v signal is for the shift motor. BUT, when the shifter is not working correctly, the orange wire will “flash” 6.6v and slowly drop to 0.0v in just a few seconds and shifter will not work. Cycling the key several times (plus 10) I see the “positive” light on my Power Probe flash and the voltage will stay at 6.6v and the shifter will work but only allows one shift and goes right back to 0v and no shift. I feel this may be an ECU issue but would like others to offer input.

Thank you in advance!!
J

 

Never tried checking voltages at switch wires or orange (is that motor) wire, as standard procedure is to look at speedo, check how many times the gear indicator flashes in sequence, which is the fault code, this tells you where the fault is in the system. If it doesn't fault code, the only explanation is, it isn't getting a signal from the shift button telling it you have tried to change, so the fault lies in the shift button or wires to or from it. If neither buttons work, it is going to be the wire feeding the shift buttons.

 

 

It won't be the ecu that has made the screen go blank. All the electronics for that are behind the screen. Don't know how much an ecu costs now, but 1/4 of your bikes value at a guess. The scatter gun approach is costly. Visually check the wires to the speedo, and you may be able to get a used speedo unit from a breaker if yours is faulty. This would enable you to check the fault codes. Or just buy an angle sensor, in the hope that it cures the problem.

 

Just curious, have you checked the voltage on the Green wire (of the pair going to shift motor)? Apparently, the resting state should be 6V on both Orange and Green.

Your ECU is detecting a problem and shutting down. The problem can be the angle sensor or something else. Many people chase ECU problems a long time.

You sound like you might be inclined for a quick and dirty fix. That is bypassing the ECU
with external relays.
Read the thread: Eliminate ES shift problems & retain functionality

If you want a drop in, fully wired relay system, go to my website:
subzerosound(.com).