2G S90 - TPS voltage way off on install

[Myk984g63]

Installed a new TPS and at the lowest direction in ECMlink, the volts are showing 2.3 and the highest is showing 2.78. how do I get it to show .63 so I can have it reading correctly in ECMlink without adjusting the settings?

 

[bigfred]

Here is a link and info on how to check the TPS:

RREs# Eclipse 2G Turbo 1G Throttle Body Swap
Closed TP Switch and TP Sensor Adjustment [2G]
1. Disconnect the connector of the TPS.
2. Connect ohm meter between terminals 3 and 4.
3. Insert a feeler gauge with thickness 0.45mm (.0177 in.) between the throttle stop and the throttle lever.
[Fold a piece of paper in half 4 times if you don't have the feeler -Ed.]
4. Loosen the TPS mounting bolts. Turn the TPS all the way counter
clockwise.
5. Check for continuity in this condition.
6. Slowly turn the TPS clockwise until the point where continuity and
non-continuity is found (pins 3 and 4).
7. Tighten the TPS mounting bolts.
8. Check the voltage between pins 2 and 4 of the TPS with the ignition
switch on, but the engine not started.
9. Standard value: 400 - 1000 mV
10. Remove the feeler gauge

 

[Myk984g63]

Yes I have done the install as stated above, I am asking how come ECMlink is reading 2v instead of .63? How would I fix this? Do I have to offset the TPS settings in ECMlink?

 

[bigfred]

Here is a good read and video about adjusting the TPS in ECMLink.

https://www.dsmtuners.com/threads/adjust-your-tps.509898/

 

[AWD-Tony]

I would check the installation again. Remove it and make sure it’s installed properly. Have you rebuilt the throttle body? The voltage indicates it’s halfway open. There’s clearly something wrong so I wouldn’t use the offset feature

 

[Myk984g63]

I would check the installation again. Remove it and make sure it’s installed properly. Have you rebuilt the throttle body? The voltage indicates it’s halfway open. There’s clearly something wrong so I wouldn’t use the offset feature

It's an S90 throttle body

 

[steve]

I am asking how come ECMlink is reading 2v instead of .63? How would I fix this? Do I have to offset the TPS settings in ECMlink?

First, what are you using as the TPS on the S90?
What does DSMLink read when you disconnect the TPS from the harness?
What does DSMLink read when the TPS is connected to the harness but disconnected from the TB?

 

[ist dwa]

Bend the tangs that touch the tps. I glued a very small plastic piece inside the tps housing where the tangs touch. When they developed the S90 they didn't take into accurate account the tps.

 

[Myk984g63]

Bend the tangs that touch the tps. I glued a very small plastic piece inside the tps housing where the tangs touch. When they developed the S90 they didn't take into accurate account the tps.

Okay, so there has to be more of a gap inside the TPS on the S90 tangs before movement? So they're not touching?

 

[Myk984g63]

When I am driving it surges from 2-3k rpm when I push the pedal and bucks the car like a bronco and it doesn't want to accelerate unless I press the pedal at least 50-60% and then looks like I am trying to jet around town which sucks if a cop sees me.

 

[Myk984g63]

First, what are you using as the TPS on the S90?
What does DSMLink read when you disconnect the TPS from the harness?
What does DSMLink read when the TPS is connected to the harness but disconnected from the TB?

It reads 5v when disconnected and 2.63v when connected and not attached to the TB.

 

[steve]

DSMLink reads 5v on the TPSVolts with the TPS disconnected?
It should read 0v with no TPS attached.

That would imply a short or wiring fault on the TPS output wire.

 

[Myk984g63]

DSMLink reads 5v on the TPSVolts with the TPS disconnected?
It should read 0v with no TPS attached.

That would imply a short or wiring fault on the TPS output wire.

Ok so where do I start with that? Sounds like a timely job?

 

[steve]

Ok so where do I start with that? Sounds like a timely job?

Since this didn't seem to be a problem before (according to earlier logs you posted) I'd go back and revisit what you did to the TPS and any other wiring changes you've made since.

Why did you change the TPS this time and what did you do?

 

[Myk984g63]

Since this didn't seem to be a problem before (according to earlier logs you posted) I'd go back and revisit what you did to the TPS and any other wiring changes you've made since.

Why did you change the TPS this time and what did you do?

In my earlier comments, I said, out of nowhere my car started surging between 2-3k rpms and I would have to push the pedal at least 50% to go past 3k and then it would catch dramatically and car would take off like a jet until the next gear and repeats through all gears and in 5th on the freeway it won't go past 3k with out flooring the pedal and then I'm going faster than everyone and definitely a red flag to a chp. So I assumed it was a bad tps so I bought a new one and installed it and here we are with
The same problems after the install and that's why I created the post. The car literally bucks like a bronco when trying to accelerate between 2-3k rpms. What should I do? Where should I start?

 

[Myk984g63]

You must be logged in to view this image or video.

 

[steve]

Sounds like it thinks your idle position switch is closed.
How about a current log?

 

[Myk984g63]

I can't drive the car with it like this or else I would. It's too jerky and honestly dangerous if there's a lot of traffic.

 

[steve]

I don't want you to do anything more than what you just did, just get a log while you do that. I suspect this is all related to your voltage problems with your TPS. While you're at it take some pictures of your TB and TPS wiring.

In fact you shouldn't be driving the car until you fix this.

 

[1990TSIAWDTALON]

SOLID advice!!!!

 

[Myk984g63]

Where's the IPS located at?

 

[1990TSIAWDTALON]

It is built into the TPS on a 2G DSM. It tells the ECU when you are completely off of the gas pedal so it is important that it see the zero volts so it knows you are not touching the accelerator.

 

[steve]

It's also something you can emulate in DSMLink. This is why I've asked you for what TPS you're using in post #7 and for a current log yesterday so I can see if it's a setup issue, a wiring issue, or something that broke.

 

[Myk984g63]

It's a TPS from autozone. I believe it's a common brand. I'll chk. Ok I'll get a log for you shortly. Thank you!

 

[steve]

I'm assuming a 2G TPS but I ask because there are others that people have reported having to use on an S90 Throttle Body.