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 Checking TPS 
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Post Checking TPS
So I went into online shop manual on how to check TPS. It's bit unclear how to check TPS. Does ignition have to be ON?
Can someone walk me through step by step?

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August 16 2011, 11:45 PM
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Post Re: Checking TPS
Sure bud.

Get yourself a feeler gauge and a phillips.

unplug/clear away stuff around the TPS till its easy to access, you'll need both hands in there. IDK how the other manifolds are, but the milli makes this hard.

detach the connector to the TPS.

From top to bottom, pin functions are:

-5v (input from ECM)
-TPS position (varying voltage sent to the ECM)
-Idle switch (ground -> 0% throttle)
-Ground

-probe the bottom two pins with your ohmeter, throttle fully closed. You should read 0 ohms (or very very close, just not infinity).

- if you get infinity, loosen the TPS screws and rotate it until you get 0 ohms. Tighten one to stop it from moving

-insert .15mm feeler gauge between the throttle wheel thing and the throttle stop. Check the continuity of the bottom two pins again, you should still get zero.

-insert a 0.5mm feeler, you should now get infinity ohms.
If you don't, loosen the TPS screw and turn it until you just get infinity.


bottom line,

no feeler gauge -> 0 ohms
0.15mm feeler -> 0 ohms
0.5mm feeler -> infinite ohms.

This should be repeatable and reliable. If it can't make up its mind exactly or if its too touchy it won't work right.

While you're messing around in there make sure the throttle stop is in the right place, it should be but just make sure that when you look down the TB the butterfly is fully closed.




NEXT!


jump TEN and GND and turn your ignition to ON, but turn off all electrical loads. Plug the TPS connector back in.

you need to probe into the second wire from the top (yellow) and the bottom one, ground (black/brown)

They make special tools to do this but you can just jam the point of your meter probe or a pin or something through the wire insulation.

0% throttle -> 0.1 to 1.1v
100% throttle -> 2.8 to 4.5v

Get a friend to do WOT inside the car, because sometimes the cable adjustment is your problem, so turning it by hand won't reveal the issue.


Scroll down in this thread, its more thorough....

viewtopic.php?f=23&t=47561

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August 17 2011, 12:53 AM
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Post Re: Checking TPS
Ignition does not have to be in ON position?
I've tried doing what you've described above but my multimeter would not read anything. What setting does my multimeter have to be in?

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August 17 2011, 1:00 AM
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Post Re: Checking TPS
resistance, any setting really, you're just looking for either 0 or infinity. Well, do the lowest setting (20 or 200 ohms maybe?) otherwise you'll just get an "out of range" signal for either.

If you're getting infinity all the time, turn the thing until you get 0. If you never get 0, time for a new TPS.


You're disconnecting the plug from the TPS, and measuring the TPS itself. The ignition doesn't have to be on because the TPS isn't even connected to the harness when you're working on it, you're looking for resistance, not a voltage.

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August 17 2011, 8:14 AM
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Post Re: Checking TPS
It's at 0 all the time (I opened/closed throttle body) and it stayed at 0 whole time. I thought I was supposed to get a reading.

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August 17 2011, 7:12 PM
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Post Re: Checking TPS
Turn your TPS untill you get a response. If no response I guess your TPS is pooched. :(

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August 17 2011, 10:09 PM
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Post Re: Checking TPS
Daninski wrote:
Turn your TPS untill you get a response. If no response I guess your TPS is pooched. :(


I tried that, would car still run with bad TPS though. Does the ignition have to be in ON when I'm checking?

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August 17 2011, 11:28 PM
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Post Re: Checking TPS
No, it has nothing to do with ignition. I even like to take my TB off when I set the TPS because it's easier than doing it in the bay. It's just a potentiometer that changes resistence based on how much you turn it. I'm not sure what you're having trouble with, I set it just like the manual says with feeler gauges and it's perfect. You could do it the low-tech way and in diagnostic mode turn it until the fan turns on and then back a touch but it's going to be slightly less precise than with a volt meter. And the car will run with a bad/off-set TPS, your AFR will just be slightly off.

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August 18 2011, 12:46 AM
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Post Re: Checking TPS
Well I did use 2 bottom prongs and turned throttle by hand and it just stays at 0

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August 18 2011, 12:53 AM
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Post Re: Checking TPS
K well the simplified version of what the manual says is that basically when the throttle is closed there should be continuity between the bottom 2 terminals, but as soon as the throttle is open at least 0.5mm (0.020in), there should be no continuity. If you're positive that you measured everything correctly then I guess your TPS really is toast.

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August 18 2011, 1:01 AM
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Post Re: Checking TPS
_-Night-Shade-_ wrote:
K well the simplified version of what the manual says is that basically when the throttle is closed there should be continuity between the bottom 2 terminals, but as soon as the throttle is open at least 0.5mm (0.020in), there should be no continuity. If you're positive that you measured everything correctly then I guess your TPS really is toast.


that would explain inconsistent idle

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August 18 2011, 1:04 AM
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Post Re: Checking TPS
UPDATE. Took off throttle body, cleaned it all up, adjusted TPS, now idles nice, I didn't even have to mess around with idle adjustment screw.

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September 02 2011, 4:18 PM
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Post Re: Checking TPS
Good stuff. . Do u get a signal yet on the volt meter? After cleaning

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September 03 2011, 3:16 AM
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Post Re: Checking TPS
Taking the time to adjust this to perfection is beyond worth it. It's completely and utterly necessary for a smooth, constant idle.

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September 03 2011, 4:59 AM
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Post Re: Checking TPS
And idling around a parking lot. My car is an absolute idiot when it comes to idling, unless you get it perfect it lurches like death. Not meant to go slow :lol:

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2002 BMW 325Xi - sold
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September 03 2011, 8:16 AM
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