Tps Stuff!

[nieko]

ok so.. i just replaced my TPS sensor about 2 days ago. and i tried calibrating it with the voltmeter but im not sure if i really understand it right, ive searched and stuff but it just doesnt make sense or maybe im doing something wrong? anyway whats happening is: im in neutral and ill just push the gas to the floor really quick it pretty much sounds like it starves and then continues starving as i accelerate. its definatly driveable, but it drives like crap and i have like negative throttle response. could anyone help me out please? thanks

[Z U L8R]

slow down dude.... what do u want help with?

[Sileighty_85]

So you wanna know why you have no throttle response?

Down load the FSM calibrate throught that if ya still got nothing

My friend had a similar issue turns out the wire harness around the #4 injector got rubbed through so check the wire harness also

[nieko]

sorry. i was rushed lol anyway what i dont understand i guess is, when adjusting the TPS do you have to backprobe it? like have all the connectors plugged in and check the ohms and volts through the back of the plug? and i was reading another thread, this problem might be more because of my grounds.... so im going to replace a few of my grounds tomorrow and try and mess with it again and see if that helps

[makulit054]

Here's the steps. Make sure you check the voltages at the ecu also just to eliminate the drastic voltages drops in your harness.
Step 1:

You will need to put your keys in and turn it to the on position (i.e. brake, engine (http://www.zilvia.net/f/showthread.php?t=190641#) lights on just before starting).

One click before starting the engine. But you don't need to start the engine for this proces.


Step 2:

Test you TPS before adjusting to ensure that it needs adjusting. Have your multi-meter and push the red

connection pin into the plug coming from the TPS. You will need to push it into the middle pin in he engine side,

then the black connection to the body so it's earthed or a ¼ panel bolt to ground. Doing this you will get a voltage

reading that should be around 0.45 Volts.


Step 3:

If you need to adjust the TPS, get the 7mm socket and the ¼ socket wrench and reach in to the TPS from

the engine side and loosen but DO NOT remove the bolts. Doing this will allow you to rotate the sensor.

Loosen both bolts until only finger tight not too loose.


Step 4:

Rotate the TPS; till you get 0.45 Volts, it may take a few minutes as it is very sensitive.

Tighten the bolts once it's set and double check the volts and away you go.

[duffman1278]

It really is sensitive, so what I do is I just barely loosen up the bolts on the TPS and that allows me to rotate the TPS in small increments on the multimeter readings.

[nieko]

^^^^ thank you for that. im a visual learner and u pretty much painted a picture in my head lOL. alll the other write ups that ive seen leave stuff out or dont make it definite. well thanks, im gunna try this 2morrow after class

[Style]

you need to hook up the black connection to the black wire on the TPS (i think its the first one) not to a chassis ground or a bolt because the TPS has its own ground.

[projectRDM]

you need to hook up the black connection to the black wire on the TPS (i think its the first one) not to a chassis ground or a bolt because the TPS has its own ground.

Which is shared through the ECU harness, chassis, and battery. Ground is ground.

[turbocarslut]

Which is shared through the ECU harness, chassis, and battery. Ground is ground.

DO NOT connect the sensor gnd pin of the ECU with a separate wire to the chassis or engine gnd. This pin is supposed to have its own separate wire to the sensors, with no connection to the chassis or engine. This pin is internally connected in the ECU to the main gnd through a low-value resistor.

[projectRDM]

DO NOT connect the sensor gnd pin of the ECU with a separate wire to the chassis or engine gnd. This pin is supposed to have its own separate wire to the sensors, with no connection to the chassis or engine. This pin is internally connected in the ECU to the main gnd through a low-value resistor.

Says who? I've been grounding ECU harnesses inside the car for years. Whatever resistance the ground feed may have it's shared common to the chassis. I have never seen or heard of this nonsense until now.

[turbocarslut]

Says who? I've been grounding ECU harnesses inside the car for years. Whatever resistance the ground feed may have it's shared common to the chassis. I have never seen or heard of this nonsense until now.


Well that's good for you! I highly doubt every car manufacturer is going to designate pins on the ECU for sensor ground for pure sh!ts and giggles.

A sensor job is to pick up a mechanical occurence (pressure, throttle position) and convert that into an electrical signal of some sort...be it a resistance or voltage. A dirty ground can and will cause noise to enter into a circuit. It's just like hooking up amps in your car and getting that annoying whine thru your speakers. Thats my friend is a signal noise amplified. The ecu COULD possibly pick noise up as well and disrupt the true signal the sensor is trying to feed.

[nieko]

well i tried the steps shown above and i got .32 or something like that and i was like cool ill just adjust it, so i loosened the screws a little bit to rotate it and i tried adjusting it but i wasnt getting a reading AT ALL so i was like what the hell? and i screwed it back in and tried it again and still didnt get a reading, and i just cant get readings now. im not sure why. your supposed to test the middle prong coming from the TPS right? that points towards the front of the car? and when u measure it do you ahve to have the other connector connected? i really hate this thing, it seems so simple but i dnt know what im doing wrong... help please my car drives like crap

[duffman1278]

Yes it has to be connected so you have to back probe it in order to do this. If anything, your TPS might be broken, but I'd make sure your doing it right, and make sure your prongs from your multimeter are in there good.

[nieko]

so the both plugs have to be connected correct? and then backprobe the connector that plugs straight into the tps correct? thanks

[xsparc]

DO NOT connect the sensor gnd pin of the ECU with a separate wire to the chassis or engine gnd. This pin is supposed to have its own separate wire to the sensors, with no connection to the chassis or engine. This pin is internally connected in the ECU to the main gnd through a low-value resistor.

Uh... yes you can. The sensor ground is just a ref for the signal, its usually taken from inside the sensor or near it. It is the SAME as the chassis and engine grounds and in fact are connected. If you have noise on your ground plane then you have some other electrical crap messed up, like a bad alt or voltage regulator.

If you really wanna check for gnd noise you need to probe your car with a o-scope. Other than that, a ground is a ground.

A floating ground is something differnet that should NOT be connected to the chassis ground, but those are not used in this car... well none that i have found yet in any diagram.

Turst me i know, i do this for a living.

[Saviorsoul]

backprobing sucks.. And God do not buy TPS from Auto Jew, I got two broken ones before I finally gave up and went to Advanced..