Thread: TPS is bad?

This is better accomplished using a digital volt meter (dvm) b/c of possible cable problems.

The Nissan Datascan will also give u this info. But neither products is good for setting the TPS; just good for spot checking that its set properly..

Yeah, that makes sense, it's only as accurate as ECU reads, and if the ECU it self is off then the software will be off.

So what happens if the WOT voltage is above 4V? Like what is bad about that?

Alright so I started messing with the TPS and using ECU talk for comparison. ECU Talk was showing the voltages being at around 0.45v for closed and 4.28v open.

I unbolted the TPS and started turning it to get the numbers, and was not able to get both the closed and WOT voltages to be under the mentioned scope. I was confused, busted out the manual and started searching to no avail. Finally got on here and saw your quote Scotty... "Adjust the throttle screw out (turn to left very slowly) until the TPS reads 4.0v EXACTLY ! !"

I'm like doh! But I did notice that the manual said that the closed voltage should be between 0.35v-0.65v and closed is said to be approx 4.0v. It does mention engine warm and car turned off but on ON (Christmas tree lights on).

I set it to be 0.45v, but I noticed my Scan Gauge TPS was showing up as 3% open and 92 when it's at WOT. The manual does mention that it should be 0% and approx 88% WOT.

Drove the car and it feels great! But it is a cold night, colder then during the day, plus I replaced my O2 sensor and installed the 91 intake cam yesterday. But still pulls hard!

Hey Scotty,

Is there a reason to why you guys are doing 0.45v at minimum? FSM calls for 0.35v at minimum. Is there a crispier throttle response from 0.45?

is TPS "calibration" someting that can directly affect throttle response?...

edit: ok i re-read my post.. it's a dumb question maybe but what i meant was... is the difference between adjusting it at like .35 or .45 or .50 really make a difference in real world?.... whats the best settings for both CLOSED & OPEN? thanx

when you mean turn the screw out do you mean loosen the bolts that hold in the TPS or do you physically have to turn the TPS?

you unscrew the bolts in order to loosen the TPS and move it....

Yes.. The FSM states .45 -.55 on SR20DE's ODB1..
Yours is probably different for ODB2.

A long time ago when I first started tuning my NX, I also found this TPS info on Se-R.Net and found the idle was much smoother with the .45 w/throttle closed (as mine was set at .49). I have tried other settings: IIRC-around .48 caused bogging takeoffs from stoplights, .52 caused sluggishness attaining higher speeds, .55 gave me starting issues. So from my experience, lower TPS closed settings worked best.

You have a much greater range.. I would try different settings and see the results. The changes will a direct impact how the ECU calculates & navigates thru the maps.



Closed settings:
Yes it really makes a difference in the real world.. The changes will impact your idle, and how the ECU calculates & navigates thru the maps which has a direct difference in throttle response, gas mpg usage, etc.

Just try different settings for a few days each. You will be surprised as it will be quite noticable.

WOT settings:
The WOT setting is controlled using the Throttle adjustment screw located beside the throttle cable connection. It controls the stop on the butterfly. The actual TPS screws are only loosed (& slightly turn the TPS) to set the TPS for Closed throttle setting.

Im not sure of the WOT settings. The ECU can only read the TPS signals up to a certain voltage.
If its over that voltage (> 4.0v), Im not sure what it does:
Does it use a special default range?
Does it go just use its highest map values?
Or does it maybe go into some kinda highend default mode??
This would be a good question for someone like Calum...