MV Agusta Forum banner

1 - 20 of 20 Posts

·
Registered
Joined
·
22 Posts
Discussion Starter #1
Hello all, looking for some help as my bike has gone into limp mode as of this weekend. When I turn the ignition on it goes through the check and finds everything ok, but the Check engine light and warning triangle stay on. It will only go 50mph and roughly 6k rpm with slow throttle response. Any thoughts on what could have caused this? I took it for a 10 minute ride and it happened after I had parked it and shut it down for ten minutes or so. Fluids are all ok, except the low fuel light had come on maybe 5 miles previously. Would take any suggestions as my nearest dealer is 4 hours away.
 

·
Super Moderator
Joined
·
21,490 Posts
Disconnect the battery and let the bike sit without power for 10 minutes or so to allow the capacitors to discharge. Then reconnect the battery.
 

·
Registered
Joined
·
410 Posts
Except for the warning indicator on, it sounds a lot like the "Speed Limiter" is on.
But, I know that function turns off with a key cycle.

Removing the battery cables is a good start.
I would also get the battery checked.
 

·
Registered
Joined
·
22 Posts
Discussion Starter #4
Cycled battery power once I restarted I received ‘stop engine gas position’ warning came on.
 

·
Super Moderator
Joined
·
21,490 Posts
This is starting to sound like a low voltage battery situation.
 

·
Registered
Joined
·
296 Posts
Cycled battery power once I restarted I received ‘stop engine gas position’ warning came on.
"Gas position" indicates an issue with the fly by wire throttle not a battery issue. There are plenty of posts around this, more than a few by me, have a read up.

I encountered the 80kmph/50mph limp mode one day on my 2013 F4RR (only the Italians would think of a limp mode this fast) which in that case was resolved by switching the ignition off and on again. I had ridden through a rain storm half an hour before it happened so some moisture could have found its way into some where critical then dried out with the engine heat in the 15 minutes before I stopped the bike.

In your case you should clean the harness plugs for the throttle and the map switch, which you should find close to the steering head, with contact cleaner. Some dialectric grease spray on the plugs would also be a good idea.

There are several versions of the fbw throttle but being a TV you should probably already have the latest, what year is it? Do you have the latest map loaded?

Tony
 

·
Super Moderator
Joined
·
21,490 Posts
"Gas position" indicates an issue with the fly by wire throttle not a battery issue.
This can be true....the issue being that the system cannot tell where the throttle is at the point of engine start. Low battery voltage during start can produce this. Look for the easy things first as start sequence and battery voltage are known issues and relatively easy fixes.

Electrical connections do benefit from cleaning and have also been the source of issues.
 

·
Registered
Joined
·
296 Posts
Another thing that has cured the issue for some people is clean the harness plugs and contacts at the ECU.

Did this first occur when you were riding or from start up?

Did the trip meters zero out when the bike starts, this is a sure sign of a battery voltage issue.
 

·
Registered
Joined
·
22 Posts
Discussion Starter #9
Another thing that has cured the issue for some people is clean the harness plugs and contacts at the ECU.

Did this first occur when you were riding or from start up?

Did the trip meters zero out when the bike starts, this is a sure sign of a battery voltage issue.
First occurred at start up after it sat for 15 minutes following a 10 minute ride or so. It did not reset the trip meter, it also did not initially throw the ‘gas position’ message.


After reading some fixes, checked connectors, battery voltage read 12 volts on the check in
menu.

The messages have gone away and will test ride tomorrow. Didn’t have dielectric grease, but will get some in case problem recurs.

Thank you for all the help everyone, here’s hoping the problem is mostly fixed.
 

·
Registered
Joined
·
410 Posts
First occurred at start up after it sat for 15 minutes following a 10 minute ride or so. It did not reset the trip meter, it also did not initially throw the ‘gas position’ message.


After reading some fixes, checked connectors, battery voltage read 12 volts on the check in
menu.

The messages have gone away and will test ride tomorrow. Didn’t have dielectric grease, but will get some in case problem recurs.

Thank you for all the help everyone, here’s hoping the problem is mostly fixed.
The bike's battery check, is a static test, and does not test the voltage whilst cranking...

Battery voltage below 10.5V while the starter motor is turning the engine, is a problem.
 

·
Registered
Joined
·
22 Posts
Discussion Starter #11
The bike's battery check, is a static test, and does not test the voltage whilst cranking...

Battery voltage below 10.5V while the starter motor is turning the engine, is a problem.
Anybody have recommendations on a replacement battery? Debating making the jump to lithium, but having trouble identifying the one I would need.
 

·
Administrator
Joined
·
18,872 Posts
Anybody have recommendations on a replacement battery? Debating making the jump to lithium, but having trouble identifying the one I would need.
Don't waste your money. Buy a Yuasa, get a smart charger (NOCO Genius as example), and ride on for 8 + years with no battery worries..... UNLESS you are racing and every gram of weight is important.
 

·
Super Moderator
Joined
·
21,490 Posts

·
Registered
Joined
·
775 Posts
Don't waste your money. Buy a Yuasa, get a smart charger (NOCO Genius as example), and ride on for 8 + years with no battery worries..... UNLESS you are racing and every gram of weight is important.
The comment is valid, however, there is another set of interests for the Lithium battery on a TV:
- the battery is placed quite higher than other bikes, and therefore, any weight gain is good in this area
- a lithium battery have a smaller footprint than OEM battery, and therefore you can gain valuable room to store a few tools, high visibility equipment and a secondary fusebox under the driver seat: for a bike designated for travel, the TV is clearly lacking in the storage area…
 

·
Registered
Joined
·
22 Posts
Discussion Starter #17
Battery did not fix the problem. Limp mode came back after a half a dozen restarts I can sometimes get it to ride normally. Anyone have a wiring diagram fo the TV? When I follow the throttle wire harness from the throttle it goes below the forks prior to getting to a connector to check. Not sure what connections are where on the bike to start checking.
 

·
Super Moderator
Joined
·
21,490 Posts

·
Registered
Joined
·
206 Posts
Battery did not fix the problem. Limp mode came back after a half a dozen restarts I can sometimes get it to ride normally. Anyone have a wiring diagram fo the TV? When I follow the throttle wire harness from the throttle it goes below the forks prior to getting to a connector to check. Not sure what connections are where on the bike to start checking.
Have you checked within the throttle assembly? I had the limp mode problem on my TV and the code was stored and then eventually cleared. The dealer indicated that cleaning the throttle assembly and throttle cams resolved the issue (what they told me). Will require a special tool to open up the assembly.
 
1 - 20 of 20 Posts
Top