V7 I - ECU

[jackpayback]

Does anyone know if the ECU retains its fuel map when the bike battery has been dead for a long time?  I mean like really dead.  I have a different fuel map from the default.

My bike sounds a bit different from how I remember it, but it could just be because I didn't ride it for almost four months.

[pyoungbl]

The ECU retains the map.  You might be having issues with fuel.

Peter Y.

[guzzisteve]

On the early Classics & Nevadas I swapped out the ECU's for an error called 'mute knot'. They ran but a little weird. I would look in errors w/software. If you see none your good.

[jackpayback]

Got it.  Could be the gas was a little old and I put some seafoam in it.  I probably have another 3 gallons of it in tank.  I'll have to figure out a way to read the ECU software.  I was thinking about getting that gadget that Todd at Guzzitech has where you can hook up to the ECU using a laptop and install new maps.

[pete roper]

The 'Mute Knot' error is connected to canbus function.

I would assume if it's on a 15M-RC it would be indicating a communications failure between dash and ECU? One of the nodes in the system generates a signal and sends it to the other receptors via the Can line and then those receptors respond with a return signal showing communication is open. If the second node doesn't respond by sending a *Return* signal it is deemed 'Mute' meaning communication is impossible and one assumes the system goes into some sort of fail-safe mode, or, with the more complicated systems like the 5 and 7SM systems where there are a host of different things communicating and interacting by canbus, it will trigger a 'Service' or 'Urgent Service' warning and may either throw the machine into limp mode or, if it is the demand sensor creating an issue it will kill the engine and very kindly put the brake light on so you don't, (At least in theory!) get run over by the eighteen wheeler bearing down on you from behind!

Pete