Auto Harness TPS ?

[BryantZamora]

My Car idles pretty high and I wanted to adjust it so I go to disconnect the TPS and realize that its already unplugged.
I couldnt find the connecter on the wiring harness itself. Its a Dual Cam Swapped from an Auto 240. Using a AUTO ecu which means its using a auto Harness correct?
I just bought this car and am learning as I go lol. I used to own a Miata.
The TPS has a wire with a female end plug coming off of the tps that plugs up to a male end off the harness. Is that the tps rewired ?
Car also feels like it doesnt have its full power.
New to the forums so i'll try to get pictures as soon as I can

[centralcoaster33]

Hello and welcome to NICO Club!

The 240sx had a few versions of TPS. One plug, two plugs, and a pigtail... The wires for the TPS are from the engine harness and are routed along the injector row then down towards your throttle body. It has plugs for the intake sub-harness, temp sensors, knock sensor, TPS sensor, engine ground and ... I forget. But that is where you need your TSP plug to be coming from.

Yes, please post a picture when you can. And clarify the following:

I just re-read what you wrote. It doesn't make sense this time. You wrote "I couldnt find the connecter on the wiring harness itself." Then you talk about the engine, then your Miata, then, in direct conflict with that sentence you write "The TPS has a wire with a female end plug coming off of the tps that plugs up to a male end off the harness." Do you have a plug or not?

Anyway, you'll want a voltmeter for the TPS, a screwdriver for the IACV, a timing light and a socket to adjust your Distributor. You can find your FSM in the service manuals link on this page at the top. You might want one for your chassis and one for your engine. You can identify your ECU by the sticker on it's side. I kind of think the Auto ECU used a two plug TPS, not the single or pigtail version so you might want to see what ECU you run to be sure.

[BryantZamora]

This is what i'm working with at the moment. My Ecu is a "EU" , which means im running a 92 auto dual cam ECU. With a Auto Harness if i'm correct (not to sure, pictures in the link) ? The owner also said the dual cam motor came from an auto 240. I've read that the tps contains 3 wires. green/red, solid white and black, I have those wires but the TPS on the throttle body itself is not connected to it, it looks like it was rewired some how (check pictures). So am I running a tps or am i not? can you tell by the pictures I know it's kind of hard for me to explain because there is miscommunication with me and the owner lol. Should I cut the wires and get the proper plug so it fits into the tps? or am I missing the plug completley?

[BryantZamora]

its not letting me post pictures or links man, anyone got an email or anything i can contact you through I need some help??

[BryantZamora]

http://s1146.photobucket.com/user/Bryan ... ent&page=1

[centralcoaster33]

Okay, I don't remember exactly, but a new user has to have some post count before adding links or images. Here's how to embed or link images:
how-to-post-pictures-using-photobucket-t521110.html
I use a photo sharing that doesn't require a user account.

The link works and I saw your album and photos. Now, you're going to need to get into your FSM and start reviewing the EC chapter and wiring. You need to match up your ECU pins with your sensor.

The TPS you have there has what I call two (2) plugs, one of which happens to be a pigtail. The TSP with two plugs does 2 things. One set of wires is for the potentiometer 0-5v curve that is your throttle measuring. The other set of wires is more like an open/ closed sensor that detects a completely closed throttle and a wide open throttle. These were used on newer KA24DE engines as well as some of the older automatics.

It appears that the closed/ wot sensor is not being used. That could be okay or that could be an issue. The thing to figure out is what your specific ECU is looking for. Does it use the second set of wires or not? Check out the good book (FSM) and let me know what you think. If you want me to review some pages, let me know where you're looking in the FSM and I'll take a look with you.

[centralcoaster33]

PS I fixed your photo embedding. You had inserted a path to your photo album, not to a photo. So I went in there and changed the link path part. For your albums, you want to look at one photo at a time. To the right of that one photo are four "link" things to use. I cut and pasted the "direct" link between the [img] things and that shows the photo.

[BryantZamora]

I don't have a FSM is there any pdf files or does anyone have knowledge already known? like u stated 8'd like to know if the ecu uses that connecter or not . How would the car react without the second pair of connecter on the TPS ?
I have some symptons like not having full power or throttle response but I suspected that is from the blown head gasket that its giving me low compression but could that be the reason aswell or ?

[centralcoaster33]

Well, I looked around and don't find the ECU computer EU. Did you type that correctly?

The service manuals are here:
http://www.nicoclub.com/archives/nissan ... nuals.html

At this moment, I am unable to get the PDF to open on my computer. I can't look for you. I do have a 1993 FSM on my computer and that one shows me the A/T control unit does look at the closed throttle switch but I don't see that the ECU itself does this.
I think you want to look at the EC chapter, circuit diagram page.

Anyway... what about doing the idle and timing how you have it now? I mean, you just wanted to unplug your TPS. I think you can do that whenever you feel ready.

[BryantZamora]

Yeah I had a hard time finding the Ecu aswell. It does say EU though heres a picture.



I will try adjusting the idle and timing to dial it once I get the head back on the car. My question is will the throttle response be affected without the connection plugged up? Anyone expierence this ?
i'll try to look up the manuels, I could always add the connection but i'm not too good with diagrams lol ill do my best.

[BryantZamora]

does anyone know how I would wire up a connecter from the ecu to the tps ?
My ECU is an Automatic ECU does anyone have a part number for the correct connecter ? I believe O reilys has two different kinds.
My ECU is a "EU"
Dual Cam KA

[BryantZamora]

To sum it up, my car was a single cam and was dual cam swapped with an engine that came off an automatic.So basicly I have an auto ecu & a auto TPS with the "6 wire" setup. Two plugs with 3 wires each basicly. I have only one plug hooked up which is used for throttle measuring. I am missing the other plug to hook up directly to the TPS, which is basiclly a open/closed throttle sensor. I need to hook this up but need some help on how to do so ??
I've read that this is NOT nessassary to have hooked up but can any clarify this ? I did expierence light bogging issue which also have read that is normal ?
Someone let me know what you think

[centralcoaster33]

A - I'm not sure you 'need' to connect that up.
B - I'm not sure you CAN hook it up. According to the FSM the TPS second plug connects to the Automatic Transmission control computer. So, you can add wires and a computer, but not just wires. Do you have that computer? That computer then connects to the ECM (ECU, ECCS).
C - Are we getting hung up on loose wires that don't matter? If your car ever ran okay after the swap, then we probably don't need it. If your harness does not have the second plug for the TPS, then either you don't have the correct harness or you don't have the correct TPS. Sometimes, people need to replace the TPS, they get whichever is cheaper or easier, so, if you need a one plug TPS and you get your hands on a two plug TPS, then you just use the one plug and ignore the extra sensor.
D - If you really just want to hook it up correctly, no more guessing or work-arounds, then you should get the ECU for a manual DOHC 1992 and use the corresponding wire harness and FSM.

[centralcoaster33]

FYI - I have read in several auto to manual swaps that idle speed is up during initial warm up of the car and that will be normal until you get a different computer. I didn't dig super deep into those threads to see if it was all idling or just initial idle at warm up.

[BryantZamora]

Oh okay , do you think this would affect my smog test?

[BryantZamora]

If anyone knows let me know so I don't waste my money or time taking it to a smog shop lol

[centralcoaster33]

What state SMOG? In CA, you'll have the sniffer hooked up and ran at 2.5k I think. They look for CEL. They'll check timing with a light. They'll note idle speed. They'll visually inspect for components like CAT, gas cap, EGR, and crankcase ventilation. Ooh, here's a neat article:
http://www.dsmtuners.com/threads/tips-f ... ch.270909/
And a PDF for the modern tech. It's tough for me to tell exactly which is OBD 1 or 2.
http://smogcheck.ca.gov/pdf/Smog_Check_ ... G_2013.pdf

Plus, you can search for pass smog and there'll be threads in here that talk about using high octane, warm up and other ideas.

So, I think you want to at least check your timing. What is your timing set at now? What is your RPM at idle when all is warmed up and happy? We can probably adjust your IACV pretty easy if it's way high. Lemme know what numbers you have. Thank you.

[centralcoaster33]

Also, to avoid late fees in registration, pay the registration. Then have the smog done and go back to get your sticker... if you have to do that.

[BryantZamora]

Passed smog

[centralcoaster33]

Whoo hoo! Nice.