TPS reset after battery change - what am I doing wrong?

[Clem]

Fitted a new battery after the original failed over the winter enforced lay up (medical issues )

Fitted the new one, key on throttle open & closed three times gently & slowly, key off, wait and then key on again.

When starting the bike, the engine revs its nuts off

I've tried disconnecting and repeating a number of times, but still the same revving results.

What am I missing?


Ta.

 

[Greenman14]

I recently reconnected my battery and followed a similar procedure, though only opened and closed the throttle two times, it worked just fine. Are you sure the throttle cables aren't jammed or snagged?

 

[littleredrooster]

...Are you sure the throttle cables aren't jammed or snagged?

^ ^ This. TPS cannot itself allow extra air into the motor to make it rev its nuts off. One or both throttles are stuck open.

 

[Deleted account 190920001]

It isn't TPS reset as others have said, your throttle is stuck open

 

[Roymondo]

Pound to a pinch of wossname you've displaced one of the throttle cables when replacing the battery and it's no longer seated properly in the splitter box.

 

[jwpzx9r]

Just how important is this TSP reset ? I have had the battery out of my bike loads of times put it back in and run the bike and it has seemed to run perfectly. Am I missing something important here?

 

[Clem]

Seems logical & obvious that the throttle must be jammed somehow.
I was dismissing this as I hadn't disturbed anything aside from the battery itself, however the enforced layoff may have effected something.

Tomorrow I'll investigate the cables etc.

 

[Deleted account 190920001]

Just how important is this TSP reset ? I have had the battery out of my bike loads of times put it back in and run the bike and it has seemed to run perfectly. Am I missing something important here?

When I have had to do it it showed as a rough throttle coming off idle. It ran OK and idled OK but the transition was lumpy.

 

[jwpzx9r]

When I have had to do it it showed as a rough throttle coming off idle. It ran OK and idled OK but the transition was lumpy.

Right next time I remove the battery I will do the TSP reset... which is to switch on , slowly fully open and close the throttle three times then switch off and then on again and start her and she is ready to go ?

 

[Deleted account 190920001]

Yes that's the procedure for TPS reset. It can be done at any time if you think the throttle is a little funky. Won't do any harm if it doesn't need done.

 

[Clem]

Todays investigation:
Throttle butterflies both working OK
Engine still revving nuts off
Disconnected the TPS - engine runs, rough, for a minute or so
Checked the TPS resistances - seems OK.
Dismantled the TPS and checked it internally - again all seems OK

Still revving hard, so now completely confused!

 

[Deleted account 190920001]

Put a vacuum gauge on and see what the throttles are doing. Could be a big air leak but I doubt it.

TPS sorts fueling out not air. For an engine to rev it needs air.

 

[younger06]

The last time I changed my battery(well my mechanic did) when the bike was started it ran like a dog, I remember he had to plug it in and change/reset something before it would run right.

 

[Mistacat]

As previously stated the engine needs air to rev.
Have you removed the rubber hoses injector body to air box and had a look to check that both butterfly`s are fully closed.
Is there someone local with a GS911 so that you can check the TPS it will read out 0 to 100% in real time values, you will also be able to check the idle actuators these mirror each other for the number of steps.
If one is stuck it will be evident. If no GS 911 is available disconnect the idle actuators in turn and see if it continues to rev.
Goes without saying that you have checked that you have not lost one of the rubbers from the vacuum test points.

 

[Bendy toy]

Todays investigation:
Throttle butterflies both working OK
Engine still revving nuts off
Disconnected the TPS - engine runs, rough, for a minute or so
Checked the TPS resistances - seems OK.
Dismantled the TPS and checked it internally - again all seems OK

Still revving hard, so now completely confused!

It's not the TPS causing it to rev. You have an air leak on the engine side of one or both throttle valves. ECU adds fuel so suit the air allowed into the engine. Too much air at no load = too many revs.

Check the flexible hoses for splits, hose clamps for tightness, balancing stubs for missing cap, etc.

 

[Steptoe]

Just how important is this TSP reset ? I have had the battery out of my bike loads of times put it back in and run the bike and it has seemed to run perfectly. Am I missing something important here?

It's not really important and no big deal, as you've experienced on your own bike.
The bike ECU "learns" the parameters of the TPS as you ride it.

The TPS simply tells the ECU how far the throttle is open.
It needs to know when the throttle is closed and where the full throttle position is.
Once it knows these positions it adjusts fuelling at the stages inbetween.

It learns this very simply by you riding it.

 

[Steptoe]

Todays investigation:
Throttle butterflies both working OK
Engine still revving nuts off
Disconnected the TPS - engine runs, rough, for a minute or so
Checked the TPS resistances - seems OK.
Dismantled the TPS and checked it internally - again all seems OK

Still revving hard, so now completely confused!

With the ignition turned off twist the throttle wide open and hold it there.

Now pull/wriggle the throttle cable on each side at the throttle body. If the cable has "popped" out of the distributor box that usually makes it go back in place.

And for the bike to be revving as you describe it usually needs the lefthand throttle to be stuck open. If the righthand throttle is stuck open the bike doesn't usually run.