Need someone to test resistance of S2 tps for me

[240z4u]

Alright, I am hell bent on making this KA TPS work. The next step is knowing what the resistance from the center terminal to each side terminal at closed and WOT.

Can anyone help a guy out?

Evan

EDIT; Sorry for the total lack of information. I am using a land rover throttle body!
Modified by 240z4u at 10:52 AM 7/15/2008

[wawazat8402]

Is this something that can be done with no power to the TPS?

If so, I will get those numbers for you this afternoon.

[240z4u]

Yeah, no power to the TPS.

The brown plug is the one with the pins that I need you to test for me.

Thanks alot!

Evan

[Joe]

why are you checking resistance? you should be checking voltage at the tps because its a variable resistor. meaning it changes as the throttle opens

the approximate readings are

.5 closed, 4.0+ WOT.

[wawazat8402]

Hope this helps.



This is set the same as when it was in the car and running. My car idled with no stumbling at about 650-675rpms once warm and read ~92% TPS on SAFC at WOT.

[240z4u]

why are you checking resistance? you should be checking voltage at the tps because its a variable resistor. meaning it changes as the throttle opens

the approximate readings are

.5 closed, 4.0+ WOT.

Joe, I am using a SOHC KA tps mounted on a land rover throttle body. I forgot to compare the resistances before I sent the TPS off to a guy on here who needs it.

Evan

[240z4u]

Hope this helps.



This is set the same as when it was in the car and running. My car idled with no stumbling at about 650-675rpms once warm and read ~92% TPS on SAFC at WOT.

Thanks so much man, thats exactly what I needed. Now I can figure out if/how far off the one I am using is.

Evan

[Sil240]

Hey Make sure that they spin the right direction!!!

I just went on a TPS hunt for a RB20 and only the Q45 goes the right direction.

[WhatsADSM]

The resistance should not matter as the ECU is reading the VOLTAGE from the throttle body (TPS).

If I have a 10k POT, 100k POT, or 1k POT the voltage will be IDENTICAL at the mid point (2.5v if fed from a 5v source).

You should be looking to ensure that you have a linear voltage output through the full sweep range of the throttle from 0% to WOT.

[240z4u]

Ill let you guys know what I work out.

The real problem I am dealing with is getting the idle switch closed/and idle voltage set while still achieving my desired WOT voltage.

Sil240, I am the one that told you about the directions of the TPS rotation! lol

Thanks guys - Evan

[gawdzilla]

what voltage are you getting closed and wot?

in order to get my throttle switch to show continuity my idle voltage needed to be set to .39 i believe. i remember it was lower than i wanted and outside of the oem spec, but that was the only way to get it to the switch to close. it also will lower your wot voltage.

[Joe]

Joe, I am using a SOHC KA tps mounted on a land rover throttle body. I forgot to compare the resistances before I sent the TPS off to a guy on here who needs it.

Evan

LOL wowinfo like that would be helpful in then original post

but it still should be read in voltage not resistance!

[240z4u]

Joe, sorry I hadn't realized that I overlooked adding that in. I edited it for clairification.

I know the reading is in volts. I am using my power FC to look at the voltage.

I may work on this tonight since I have to yank my old radiator anyway.

Evan

[Sil240]

Oh yeah haha.I didn't realize it was u. lol

Just tryin to pass on the good info!! lol

[WhatsADSM]

Honestly... As long as it is linear and you can set the idle and WOT voltages in the PFC then it really shouldn't matter since it is just getting digitized in the ECU anyways.

So yea honestly I would make sure you get the idle switch working first, then (if available in the PFC) set the WOT voltage to just under whatever voltage is output when your particular TB setup is at wide open.

As long as the ECU understands it is WOT, its not like the car will be any slower with a TB that outputs 3v at WOT versus one that outputs 4.5v

[240z4u]

Honestly... As long as it is linear and you can set the idle and WOT voltages in the PFC then it really shouldn't matter since it is just getting digitized in the ECU anyways.

So yea honestly I would make sure you get the idle switch working first, then (if available in the PFC) set the WOT voltage to just under whatever voltage is output when your particular TB setup is at wide open.

As long as the ECU understands it is WOT, its not like the car will be any slower with a TB that outputs 3v at WOT versus one that outputs 4.5v

Exactly, we are on the same page here. I am getting some funky response on tip-in actually.

I won't be able to drive it till next week anyway.

Evan

[240z4u]

Hey dude, you had your meter set to K ohms right? Just checking.

[Kansei240sx]

You can still check the TPS using resistance, so it isnt incorrect. When you dont have the TPS hooked up ( on a table out of the car ) it can still be calibrated there.

Although back probing the connector when it is installed and hooked up is ideal when calibrating it as well. Even some of the Nissan FSM's give specs for the closed and WOT positions and the resistance it is supposed to have.

[240z4u]

You can still check the TPS using resistance, so it isnt incorrect. When you dont have the TPS hooked up ( on a table out of the car ) it can still be calibrated there.

Although back probing the connector when it is installed and hooked up is ideal when calibrating it as well. Even some of the Nissan FSM's give specs for the closed and WOT positions and the resistance it is supposed to have.

I am using the resistance numbers to compare the useful range of resistance of this TPS vs. the stocker.

Thanks Kansei, Ill update tonight when I get done jacking around with this. I took apart the KA tps to check out how the idle switches etc.. work. There is a sitch that engages in the last 1/3rd of pedal travel and one that engages for idle. I wasn't aware of the WOT part.

Evan