Occasionally my rev counter pointer will fail to move. It usually starts working when the bikes warmed up. I'm thinking the pickup from the engine might be affected by the heat & just need a clean? If I can find it! Anyone else experienced this? Cheers Stuart
On the 749/999 the dash gets the tacho pulse from the ECU. As it goes away when warm I wonder if you have a dry solder joint or broken cable fault. Could it be a faulty Crank Position Sensor? You can do some continuity checks on the cable from the ECU to the connector at the back of the dash (sorry don't know which pin it is) using this for reference. The ECU plug you are interested in should be grey. (ignore the cross and tick, that's to do with ECU programming and also the two lines). You're after Pin 9 on the 'grau' grey side of the ECU.
I've just been looking at the wiring diagram for the bike and can find no output from ECU pin 9 to the dash on it. Does anybody know if the output is sent over CAN? That would be Pin 20 and 29 on the grey side to the dash Pins 8 (white/yellow) Pin 14 (white/red). The Crank Position Sensor feeds Pins 25 and 35 on the ECU black side.
Posed the question to one of our Gurus on another forum "Strange fault, as the rev signal is generated at the ECU then by CAN to the clocks as does the Engine Temp reading, if it was linked to the fans then I would suspect a Earth/0 Volt issue, but I suppose the first thing I would be checking is the 26 way connector in the back of the clocks for Oxide build up between pins in case of tracking paths that could be pulling signal levels down"
Ok. Best I look into getting at & removing the plug. Sounds like it'll need a spot of contact cleaner. Just moving it'll probably cure the problem temporarily. That's the trouble with intermittent problems. Thanks for your help & I will keep you posted. But it may take a while before I'm sure it's sorted.
If you've not had the clocks off before they are just push fit into two rubber grommits. You just firmly pull them towards you. The connector is held in place by one of the lugs that goes into one of the grommits. Just remove it with an allen key. Keep clear of the grey buttons as they are fragile.
That doesn't sound to hard to get off. Got the bike packed against a wall in a cold, tight garage so may have to wait until the weekend to investigate more.
I've not had the fairings off but have pulled & pushed the clocks a little to (I think) cure the problem. It's not come back so perhaps I've moved the rear plug enough to fix this. I hear it's a common occurance. I was worried if I pulled the dials off completely I'd not be able to get the thing back on lol. If they came off that easy they'd be nickable wouldn't they Anyway, time will tell on this one.
