2004 ST4S Linear or Non-linear TPS?

[gonzofro]

Im attempting to adjust the TPS sensor on my 2004 ST4S and am reading the Desmotimes service manual wherein it indicates that I have a linear TPS; however, I have a Weber TPS which it says is a non-linear TPS.

I do have the 59m ecu which it says is mostly linear TPS.

Which method do I use to adjust my TPS (software or physically rotate tps)? It does have a note saying that the 59m ecu is set using software, but I am just a little concerned that my TPS is the one used to illustrate a non-linear TPS. Also bikeboy.org's tutorial on how to do the TPS reset says ALL ST4S's are non-linear.

Colin

[stryder]

Check out this thread and Derek's remarks:

ST4S electronics on an ST3 engine

Can you do me a favor? I love being able to do things manually. I can set the TPS on my '87 K bike, (open loop efi with a proper throttle cable) by sound. When it's in "range" for lack of a better word, the tps unit itself will emit a distinctive "ping" when the throttle is "cracked." I can set it by loosening the 2 screws and then rotating it ever so slightly one way or the other and am wondering if any of this technique might be transferrable to the Ducati ST3 open loop system/TPS. Can you listen to your tps, may be difficult with the LH panel on, before and after your adjustments and see if it "pings" more loudly when adjusted? I know it pings but it is very soft on my bike. Because if it does, and the tps can be set by hand, ie rotated, then I won't need to buy the expensive technoresearch software and a lap top or other device to run it. Yes, I'm cheaper than Tonered.

[hnracing]

Do go out and look at the TPS.

Non-linear TPS
Marelli PF3C
Note that it has a slotted mounting hole.
This one should be set to 150mV at fully fully closed.

Weber PF09
Note that it has a slotted mounting hole.
This one should be set to 150mV at fully fully closed.


Linear TPS
Marelli PF1C
Note that it has a round mounting hole.
No mechanical adjustment needed.


Marelli IPF2CB
Note that this is pressed into the TB housing.
No mechanical adjustment needed.

[brian91cfr]

hnracing if you have them handy could you measure the length of
the
M5-Bolts/screws that secure the PF09 please,
would be great.

brian.
sorry to hijack the thread a little.

[stryder]

@ hnracing: great post, thanks.

[gonzofro]

I have the Weber TPS which in your photos you identified as "Marelli PF09" (has "WEBER" in bold letters across the case hence me calling it that). Everything I've found has indicated that the 59m ecu is a software reset TPS. Thus it doesnt matter what the voltage at closed is since the ECU will be calibrated to it's output. At least that's my theory. I have the VDST package so will proceed with doing a software reset on it and see how that works. If that fails then I can always set the TPS voltage and reset the ECU.

Colin

[Stick]

Also, are the connectors on all 4 of these the same? (i.e. Would the same power commander unit plug into any/all of these?)

Agree...GREAT post!

[Gearbox]

Originally Posted by Stick

Also, are the connectors on all 4 of these the same? (i.e. Would the same power commander unit plug into any/all of these?)

Agree...GREAT post!

FYG - A Power Commander does not "plug" into the TPS , it sits in between the Fuel Injector leads (i.e. the original injector of each cylinder plugs into the PC and the respective PC lead plugs into the injector) it then takes a feed off the TPS sender wire (spliced and soldered).

[hnracing]

M5 bolts: They are around 15mm long.

Does it not say Weber

The workshopmanual for ST3 with 59M and Weber PF09 section D5 "adjusting the throttle body" says fully fully closed 150mV and idle 403mV.
It also mention the trimmer function that is done via software.
But no reference to any software reset of TPS.
Note that the non-linear TPS do exist of two curves with a "knee".
The ECU can never know where that "knee" is.
So it is essetial to adjust the non linear TPS to the 150mV.

The PC need the signal from the sensor cable of the TPS.
The TPS have three cables +5V, signalground, sensor.
The above TPS do not have the cables in the same position.
So measure them or look it up in a wiringdiagram.

[Stick]

Gearbox: My PCIII unit plugs into each of the 3 things: 2 plugs for each injector, and 2 plugs for the TPS. I ran it on my ST4s.

hnracing: I see that the connectors are in various exit positions, I was curious if they all took the same physical mating connector plug.