Erratic TPS readings - MVAgusta.net
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post #1 of 15 (permalink) Old 06-17-2019, 08:19 AM Thread Starter
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Erratic TPS readings

Tried to measure the TPS while cleaning air filter. Only to find that i cant get a stable reading out of it, jumps all over the place.

TPS dead?

F4 750 with Brutale 910S motor
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post #2 of 15 (permalink) Old 06-17-2019, 08:38 AM
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Are you having rideability issues?

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post #3 of 15 (permalink) Old 06-17-2019, 09:57 AM Thread Starter
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Just wanted to see if the readings have stayed where i put them. And wanted to check where the idle readings were.

F4 750 with Brutale 910S motor
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post #4 of 15 (permalink) Old 06-17-2019, 10:00 AM Thread Starter
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And yes its does not want to stay idling when starting hot. Have to start it with rolling the throttle on a bit.

F4 750 with Brutale 910S motor
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post #5 of 15 (permalink) Old 06-17-2019, 11:29 AM
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Use an ohmeter...preferably an old analog type. Measure the resistance as you slowly open and close the throttle. Readings should smoothly change from low to high (or vice versa depending).

Twitchy needle on the analog or jumpy numbers on the digital tell you the potentiometer contacts are worn or dirty..... TPS is faulty.

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post #6 of 15 (permalink) Old 06-17-2019, 11:45 AM Thread Starter
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Seems i did not push the probes long enough inside the connector. Got a reading now that i used a bit of violence...
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F4 750 with Brutale 910S motor
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post #7 of 15 (permalink) Old 06-17-2019, 12:14 PM
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Your engine is a B4 right? Year? Please put that info in your signature line.....

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post #8 of 15 (permalink) Old 06-17-2019, 11:36 PM
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ViggenF4;
You don't use an Ohm meter to set TPS.......I know that would be the logical way
You need to lie to the ECU and tell it that's it's at 2.3 with a VDST from Techno Research

Ed;
The TPS on MVs is a dual slope.......I know, that doesn't make any sense either
The TPS is available at any Harley Davidson dealer for $39.......MV doesn't sell them

Ask any BMW mechanic what to set the TPS on an R1150......381 Ohms.......NOT 300-400 like the book says

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post #9 of 15 (permalink) Old 06-18-2019, 05:57 AM
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@theknurl @ViggenF4: this bike is a hybrid. It is an F4 frame...of indeterminate year. It has a B4 910 engine....again of indeterminate year.

Things like this make me crazy as the manuals do not directly apply and diagnosing and issue can be problematic as you can't tell if the bike should use VDST, MSDT, a voltmeter...or what.

ViggenF4...please, so we can help you, put that data in your signature line. The year is very important.

Of course, if you have used other Throttle Bodies, this gets more complicated.......

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post #10 of 15 (permalink) Old 06-18-2019, 07:12 AM
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Noel.....regardless of the actual signal usage and method of "setting"....the TPS is a 3 wire potentiometer and the test process I use applies. Erratic (not smooth) changes in resistance while going from fully closed (idle) to fully open (WFO) indicate worn or dirty internal connections and a failed (failing) part.

I used to be fast....now I just dream about it.
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