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https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl Picogroup Area (contact administrator for access) >> Picogroup Motorcycle Discussion >> Fly by wire Throttle sensor question https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1772392993 Message started by James H on Mar 1^st, 2026 at 11:23am

Title: Fly by wire Throttle sensor question
Post by James H on Mar 1^st, 2026 at 11:23am

Can someone give me your thought on the this Throttle position Sensor waveform? 2013 Aprilia Tuono. It has 2 TPS sensors for redundancy but I have only come across other system where the redundancy is a mirror image and this is not. The bike intermittently throws a code and goes into limp mode. The fault is "Throttle sensor mismatch between channels c and d"

https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?action=downloadfile;file=Aprilia_Tuono_V4R_TPS_CD.psdata (16805 KB | )

Title: Re: Fly by wire Throttle sensor question
Post by James H on Mar 1^st, 2026 at 11:34am

Other waveform

https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?action=downloadfile;file=Aprilia_Tuono_V4R_TPS_AB.psdata (16307 KB | )

Title: Re: Fly by wire Throttle sensor question
Post by Grant B on Mar 1^st, 2026 at 3:15pm

I've looked at both of your .psdata files.

From .psdata file "Aprilia_Tuono_V4R_TPS_CD":
"as per manual on page 162 - voltage should be between 600 and 1400mv."

Where is ths voltage supposed to exist? Do you have a wiring diagram to share?

I found the following forum thread that refers to a 2016 Aprilia RSV4 RR with a P0155:

https://www.apriliaforum.com/forums/showthread.php?372293-2016-RSV4-RR-Engine-cutting-out-when-applying-quot-too-much-quot-throttle

An excerpt from the resolution post:

"...The issue is fixed and it was not the Throttle Position Sensor...
It was the security/lean angle sensor bolted on the tank...I put a tank from a 2018 RSV4 RR with the stock 2018 security sensor on my 2016 bike. The security sensors are different between 2016 and 2018. Installed a 2016 sensor and that resolved the issue."

Title: Re: Fly by wire Throttle sensor question
Post by James H on Mar 1^st, 2026 at 7:00pm

The service manual is unclear in my opinion, as far as I can tell its where i'm checking it. I can't see how it would have anything to do with the lean angle sensor as it goes into limp mode, a fault with that should result in a no run condition. I'll dig up a wiring diagram.

Title: Re: Fly by wire Throttle sensor question
Post by James H on Mar 1^st, 2026 at 7:33pm

Wiring diagram is crap..welcome to the world of motorcycles

https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?action=downloadfile;file=aprilia-tuono-v4-1100-rr-factory-e4-eu-usa-asia-20.pdf (268 KB | )

Title: Re: Fly by wire Throttle sensor question
Post by Grant B on Mar 4^th, 2026 at 11:28am

James H wrote on Mar 1^st, 2026 at 7:00pm:

I can't see how it would have anything to do with the lean angle sensor as it goes into limp mode, a fault with that should result in a no run condition.

In the automotive world, any circuit related to electronic throttle control is tightly monitored. Anything that puts an abnormal load on the engine can cause false throttle-related codes. I believe it is Dodge with Cummins and an electrically-controlled (PWM?) fan clutch...when the fan clutch starts failing the engine computer will code for throttle-related circuits (not fan clutch related circuits).

Sorry I can't read anything in the wiring diagram image due to image resolution. Like you say, the wiring diagram may not be much help anyway.

Title: Re: Fly by wire Throttle sensor question
Post by James H on Mar 4^th, 2026 at 12:13pm

Appreciate your thoughts and taking the time to have a look.

Title: Re: Fly by wire Throttle sensor question
Post by StitchB on Mar 11^th, 2026 at 12:45pm

Grant, great point on the cummins fan as I have seen that, makes no sense, but is what it is.

James, I guess this is the old question of what does a good one look like. Material states between 600 and 800 MV and I seen no corelation to that anywhere. Most throttle I have seen are revers, one starting say for example, 5 volts and decending and the other starting at 0 and rising. Again how did they do it and sure would be nice to see a known good one working.

Thanks for the info both guys,

Larry