My motor is out, and the TB's are on my bench. Can I bench set the TPS?
Can I supply 12v direct to the hot lead into the TPS, and take my mv reading off the other two terminals? Or is the voltage reduced somewhere before power gets to the TPS?
Just seems like it would be a piece of cake when it's sitting right in front of you.
I have a spare TPS connector left over from a salvage harness, so I can easily isolate everything.
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I race because other sports only require one ball
Team GMB, 2012 GTL National Champions
CCS/ASRA Team Challenge Endurance Series
My motor is out, and the TB's are on my bench. Can I bench set the TPS?
Can I supply 12v direct to the hot lead into the TPS, and take my mv reading off the other two terminals? Or is the voltage reduced somewhere before power gets to the TPS?
Just seems like it would be a piece of cake when it's sitting right in front of you.
I have a spare TPS connector left over from a salvage harness, so I can easily isolate everything.
TPS isnt using 12v though. They use a 5v reference. Which bike?
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Give a pig a fish and he'll eat for a day, give a pig bacon and his relatives arent safe.
You could really mess it up, When its all back togther and it will not run right, Its one more piece of the puzzle to figure out,
Tps sends the ECU a signal and this being out of whack, Your injector timing, ign timing will get tossed out the window.
That TPS adjustment is #2 killer of MV Agusta's I see when people cant get them to run right.
TPS isnt using 12v though. They use a 5v reference. Which bike?
Excellent piece of info there. It's for SS racebike with a 1.5 ECU
So, if I supply 5v in I should be OK to take the reading? It's obviously much easier to back everything off, and get the primary butterfly shut, fuss w/ the TPS /set to 150mv with it on the bench. I'll take a closer look at the wiring diagram tonight [not that it will help me , but out of curiosity where is the voltage being reduced?
To go a bit further, is the voltage input/reference 5v on a 1.6 ECU TPS also? [for future work on other projects]
I very familier with doing it on the bike, using the pins at the ECU on 1.6's, and back probing the connector on the 1.5 [impossible to get to the pins on the ECU] but while I'm waiting for other things it would be convenient to take care of some of these little tuning issues.
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I race because other sports only require one ball
Team GMB, 2012 GTL National Champions
CCS/ASRA Team Challenge Endurance Series
Funny you should ask. I'm in the process of making a 5v source as I type this to do the same bench test. I have a 748.
TPS facing you.
Right terminal=5v.
DVM (digital volt meter set to 12v DC) between center and left terminal.
Readings: Throttle valve fully closed-.05-.25v
25degrees open-2.64-2.97v
35 degrees open-3.31-3.63v
85 degrees open-4.77-5.00v
per Haynes manual.
The books states to take these readings while turning the throttle grip, so I assume that it starts from an idle position and not with the butterflies bottom out, like you would while looking for the 150mv reading.
Will report on progress...stay tuned.
TrickLidz, I tried to pm you but your mailbox is full
Empty!!
BTW: Ignore what I said above about building a 5v source!!!
Not practical. But the above numbers still apply, just use the 5v from the wire to the TPS, with a jumper.
I would not use an external power input, as any difference between the external power and the ECU supplied power will likely change the baseline setting, and negate any adjustments you attempt to make. I could be wrong here, but when you're looking to set that baseline to within 2 mV, it may be a factor....
Some pics with mV readings at various TPS open percentages, after setting the TPS to 150 mV....(click "Next" at the top of each page for the series)
I would not use an external power input, as any difference between the external power and the ECU supplied power will likely change the baseline setting, and negate any adjustments you attempt to make. I could be wrong here, but when you're looking to set that baseline to within 2 mV, it may be a factor....
Some pics with mV readings at various TPS open percentages, after setting the TPS to 150 mV....(click "Next" at the top of each page for the series)
I had found an adapter [120vac to 5vdc] but it's actual output is 5.02
I don't know if the extra 20mv would make a difference, but to be safe I'm going to take your advice and do it through the ECU.
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I race because other sports only require one ball
Team GMB, 2012 GTL National Champions
CCS/ASRA Team Challenge Endurance Series
yeah, it'll make a difference. Here's what I got.
Through ECU- Signal-Red wire= 4.99v
Output to ECU-Throttle plate bottomed close- Yellow wire=.396mv
Throttle plate full opened- Yellow wire=4.69v
Then, with an external 5v source that actually reads 5.99v
Output- closed=.465mv
opened=5.53v
As you can see the output voltage rises as the input rises, throwing the whole thing out the window!!
Also, you can see that my TPS is Shit!!
I haven't been able to get this thing close to the required 150mv close, 420-460mv idle, it's more like 600mv at idle. But it's a trackbike so it still runs OK. Still I wish I had another used one (new one's are $$$$) to play with.
The above numbers are with the TPS removed and operating it from the back, stop to stop. Total range= .396MV-4.69V
bench set the TPS?
It's for SS racebike with a 1.5 ECU
, but out of curiosity where is the voltage being reduced?
Linear Mode
