how to check tps voltage - Page 2 - SR20 Forum
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#21 (permalink) Old 10-07-2007, 09:50 PM
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That is interesting, I usually just set the bottom range to be .44volts and that is it. YOu can't set the top range.

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#22 (permalink) Old 10-07-2007, 11:39 PM
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To clear some things up... the test can be done with the engine OFF... only the ignition needs to be on.

With the ignition on, find your ground wire or use a chassis ground, and one lead should read about 12, one should read about .5, and one should read nothing (ground). You are adjusting the .5 wire by untighting the two screw and manually adjusting/turning the body of the TPS.

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#23 (permalink) Old 10-08-2007, 06:31 AM
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Pedro: Yes the connector is removed. You can see it there just to the left. You need to remove the connector to get the resistance measurement (cannot be done in circuit). I think you should remove your tps, and try looking at the resistance across the leads while you work it manually and see if gives you "smooth" resistance, like a steady increase when you work it up the range. There's no way you've got 300 something volts. If you get smooth resistance, you're probably good. I think it should read from like 500 ohm or less, to like 20k or something. Someone correct me if I'm wrong here.

Coach: You can set the top range by adjusting for the bottom, and then checking the top. If it's out, you adjust the throttle stop screw where the cable is to make it lower or higher. It doesn't need to go far.

Teal97: Explain about the 4.16 thing. I figured as long as you were close, but outside the range, you were good to go.

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#24 (permalink) Old 10-08-2007, 09:09 PM
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i first discovered the effect by accident ~8yrs ago on my car. i was getting a flat spot (or actually worse) at wot. i measured my tps v at wot and it was ~4.2x i think. anyway, i kept adjusting it down till the aberration disappeared. i had forgotten about it until a few months ago when i was just "surfing through the fsm" and came upon the info i mentioned. then the light bulb in my head lit up
i'll try to find it and get back here with a more specific reference.

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#25 (permalink) Old 10-08-2007, 10:34 PM
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You have a manual SR20DE, right?





That's from the FSM for the 94 Sentras, but you should have the exact same sensor. You can test it two ways
Voltage, or Resistance (ohms)
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#26 (permalink) Old 10-08-2007, 11:22 PM
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ya i have an sr20 duh!!!and 5 spd!!!(1991 nx2000)what forum is this!!!j/k


but thanks rabid raccon that 100%what i wanted to see........hope this helps anyone else with the same problems i have
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#27 (permalink) Old 10-08-2007, 11:24 PM
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one more quick question.....HOW THE HELL CAN I FIT A PHILLIPS SCREWDRIVER IN THERE??????thers only like 2 inches of room back ther....
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#28 (permalink) Old 10-08-2007, 11:45 PM
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Originally Posted by pedronx2k View Post
one more quick question.....HOW THE HELL CAN I FIT A PHILLIPS SCREWDRIVER IN THERE??????thers only like 2 inches of room back ther....
Buy a stubby screwdriver or use a phillips bit and turn it with the appropriate size wrench/socket, I believe it's 1/4".

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Last edited by jer_760; 10-09-2007 at 12:47 AM.
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#29 (permalink) Old 10-08-2007, 11:54 PM
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#30 (permalink) Old 10-09-2007, 06:27 AM
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My stubby just fit right in there with a little coercing. If you buy a stubby, get the shortest one you can find. They are worth a million dollars.

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#31 (permalink) Old 10-10-2007, 11:32 AM
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ik so i just did this and it worked right!!!closed i set it at ..4 and wide open at 4........i couldnt get it to go any higher??but i adjusted the stop screw on the throttle pulley *** *** i went WOT no voltege would register on the mm....so i adjusted it so *** it was at WOT it read 4.0v
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#32 (permalink) Old 03-12-2008, 04:44 PM
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quick question... If the voltage is reading 2.25 volts fully closed, and 5.08 at 1/4 throttle all the way to WOT, is that sensor is bad, even after trying to adjust there is hardly any change.
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#33 (permalink) Old 03-12-2008, 05:14 PM
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Originally Posted by mzdafrk View Post
quick question... If the voltage is reading 2.25 volts fully closed, and 5.08 at 1/4 throttle all the way to WOT, is that sensor is bad, even after trying to adjust there is hardly any change.
Yep man.. it is pretty much screw..

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#34 (permalink) Old 12-16-2008, 03:04 AM
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Does anyone know off hand the wiring of a 96 G20? There are many more wires than the three listed here.
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#35 (permalink) Old 03-24-2009, 12:51 PM
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#36 (permalink) Old 03-25-2009, 06:48 PM
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Does anyone know off hand the wiring of a 96 G20? There are many more wires than the three listed here.
Then it must be an automatic. I think it should be the white wire, but just get a multimeter and start probing to find out for sure.

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#37 (permalink) Old 12-16-2009, 09:30 AM
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^Ok. What is up with step #4? So I'm testing the TPS with a voltage meter while everything is plugged in while the screws are loose? How do I fit the postive and negative of the meter in there like that?

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#38 (permalink) Old 12-17-2009, 12:46 PM
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I tried to adjust my TPS with a voltmeter, put it on 0,45Volt closed. WOT was 3,8volt. So I adjusted the WOT with th screw to allow the throttle to open just a bit more to make it 4.0Volt (and I don't know if that what I did was the proper way)

Still a bit jerky, ECU closed fuel usually right on but once in a while too early. Car went like boink! Very annoying.

When I got Datascan, I learned that it read's TPS voltage and has a throttle closed signal. The throttle closed signal was given at 0.36Volt. I did not try to find or look in to how to get the throttle closed signal adjusted to 0.45 Volt. Is this possible at all?

So I adjusted the TPS to 0,36Volt right on the Throttle closed signal. Car now doesn't act strange anymore and is smoother at tiny throttle opening, so for city driving a lot more comfortable.

I wonder if I took the right steps and how do I get it to FSM voltages with Throttle closed?
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#39 (permalink) Old 12-17-2009, 02:08 PM
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^Ok. What is up with step #4? So I'm testing the TPS with a voltage meter while everything is plugged in while the screws are loose? How do I fit the postive and negative of the meter in there like that?
Stick a paper clip or something in the back of the plug to get your reading from if you can fit the dvm lead in there. Pos goes to the signal wire, neg lead goes to engine ground (not the tps plug ground). Check readings with screws loosened or still tight, it doesnt matter.

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#40 (permalink) Old 12-17-2009, 02:18 PM
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- Well I swapped out the TPS and it is still doing the same thing. I'm going to change out the O2 sensor, fuel filter, and spark plugs.

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