tps values

[Bri7man]

I'm trying to adjust my tps per tsrm and I'm seeing avery very strange pattern..

For clarity I quote JSeaman,
"turn the TPS fully anti clockwise until you get a 1 (for infinite resistance) then slowly turn it back until it 'deflects' i.e. you get a reading of resistance.."
From his guide thread http://www.supramania.com/forums/sh...IDE-Calibrating-TPS-(Throttle-Position-Sensor)

and TSRM
"Gradually turn the sensor clockwise until the ohm meter deflects.."
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=103

Here's the issue, with my tps #89452-28030(vertical prongs-vertical plate) resistance is displayed while turned all the way counter clockwise and I get a "1" when turning clockwise.

So being forced to adjust it backwards and securing it where it deflects as I turn it counter clockwise...

No luck, the rpms jump to 1500 then cut to 700 on its own at this setting.

So I happen to have another tps # 89452-14050(horizontal prongs-horizontal plate) and installed the correct horizontal plate for it on the throttle body and same thing as above, deflection occurs backwards.

Been thinking on this for hours and can't come up with any reason why this should be happening...

 

[Bri7man]

I need this figured out asap so I'm gonna give some more info. I don't think it's relevant and I'll explain why but here's a mod I did.

I wanted both vacc lines on my throttle body and I HATED the USDM linkage so I dismantled the rod that holds the throttle plate and linkage on my jdm body, did the same to the usdm one and installed the jdm rod and linkage onto my USDM body.

I don't think is relevant tho as you can see in the pic; I placed the usdm linkage and rod above the installed one how it would sit when closed and they are both vertical. The only variable is what plate I use, in the pic I have the horizontal plate installed because I was testing 89452-14050(horizontal prongs-horizontal plate).

 

[Bri7man]

Anyone?

I'm just going to adjust it by hand till it's right like I always have but I need to know why the values are reversed or else I'll go crazy.

 

[hvyman]

Iirc the jdm throttle bodys are different on the tps part.

Why do you not like the stock linkage?

Look at the taps for the tps on the usdm and compare to the jdm. Iirc the taps for the tps are up and down on the usdm.

 

[IJ.]

If it's backwards it's not going to work right ever as the idle switch will be at WOT?
(on a normal TPS you'd just swap the wires)

 

[Bri7man]

Iirc the jdm throttle bodys are different on the tps part.

Why do you not like the stock linkage?

Look at the taps for the tps on the usdm and compare to the jdm. Iirc the taps for the tps are up and down on the usdm.

The USDM linkage has like 2-3 pulleys leading to the TB pulley, that is utterly retarted. I also am pretty sure it has nothing to do with my issue like I said above.

This is because the only difference in TPS' is the plate they connect to like I said above, check this out: http://www.supraforums.com/forum/showthread.php?t=551400&highlight=tps+part

And as i said before I have both model TPS' and the plates they correlate with. Still shows backwards deflection even though it is absolutely no different that a stock setup in that aspect in any way.

If it's backwards it's not going to work right ever as the idle switch will be at WOT?
(on a normal TPS you'd just swap the wires)

The values are backwards not the actual tps, which is why this is such a stumper.

I CAN adjust it by hand, disregarding the values and get it operate normally, but I want to know why the values are backwards.

All I can think of is both TPS's happen to be broken.. but they are both in amazing condition, springs are strong and show no signs of damage. So the odds are against me..

 

[IJ.]

Do you get an IDL signal when the throttle is closed?

 

[Bri7man]

Do you get an IDL signal when the throttle is closed?

A measure of resistance testing the IDL pin alone?

 

[IJ.]

Perform the test outlined in the TRSM....

 

[Bri7man]

Perform the test outlined in the TRSM....

I've done all those, are you talking about IDL-E2 tests?

.5mm test checks out and .9mm test.... well these tests are to determine if the tps is calibrated right? Which is the sole purpose of this thread, I can't calibrate it per tsrm.

Yes I can get IDL-E2 with .9mm gap to show a resistance reading by turning it counter clockwise and it will show infinite resistance "1" when turned clockwise.

Which test are you talking about specifically I've done them all and they all check out but actual calibration, deflection is backwards..

Edit,
Ahh that diagram you posted didn't show up for me until I quoted you, I'll def check that out.

 

[IJ.]

What voltage do you see on IDL open/closed?

 

[Bri7man]

What voltage do you see on IDL open/closed?

First just to be sure.... does this specific test change upon position of tps, If so we need to find a position to secure the tps beforehand.

Edit,
Wait voltage shouldn't change......

 

[Bri7man]

I measured IDL-E2 on the ECU with both TPS's and got -0.01v each time open/closed. I was supposed to measure the ECU pins and not the connector right?

 

[mkiiichip]

take volt meter. put neg lad to ground. put pos lead to IDL wire (at TPS or ECU does not matter, unless you suspect a damaged wire).

what are the values, (everything pluged in, ignition on, i prefer motor not running) closed throttle.......... open throttle...........

you should see 12v and 0v

IIf you see no voltage loosen screws, rotate TPS both ways. see any voltage now? if not (and your TPS inputs, are good) time for a new tps.




Now that i think about it though, all this swapping parts you have done could have created an issue impossible to diagnose on a keyboard.

 

[IJ.]

take volt meter. put neg lad to ground. put pos lead to IDL wire (at TPS or ECU does not matter, unless you suspect a damaged wire).

what are the values, (everything pluged in, ignition on, i prefer motor not running) closed throttle.......... open throttle...........

you should see 12v and 0v
IIf you see no voltage loosen screws, rotate TPS both ways. see any voltage now? if not (and your TPS inputs, are good) time for a new tps.




Now that i think about it though, all this swapping parts you have done could have created an issue impossible to diagnose on a keyboard.

Can you point out the 12v line please?

 

[mkiiichip]

good call. 5v reference

in correction you should see APROX 5v and 0v

i should have caught that. sorry for the misinformation.

 

[Bri7man]

take volt meter. put neg lad to ground. put pos lead to IDL wire (at TPS or ECU does not matter, unless you suspect a damaged wire).

what are the values, (everything pluged in, ignition on, i prefer motor not running) closed throttle.......... open throttle...........

you should see 12v and 0v

IIf you see no voltage loosen screws, rotate TPS both ways. see any voltage now? if not (and your TPS inputs, are good) time for a new tps.




Now that i think about it though, all this swapping parts you have done could have created an issue impossible to diagnose on a keyboard.

When testing at the ecu do I unplug the connector and test at the pins? I wasn't sure so I stuck small sewing pins in the back with it plugged in and got IDL-E2 with throttle open no voltage, +B1 to gound 12v, +B to gound no voltage, +B1 to +B 12v. E1 to ground no voltage.

I still have the other tps to test.

Question: When testing for voltage at tps on IDL wire I use the same pin technique through the back of the plug right? (I just learned about back plug wiring or w/e you call it today)

 

[Poodles]

Use an analog meter, digitals delay a bit and it's harder to read the moving numbers.

Are you testing the right contacts as well? Keep in mind the pins are upside down on the GTE:

 

[Bri7man]

Yeah IDL and E2 are the bottom ones.

But I'm curious when testing the TPS for voltage like IJ and Mkiiichip have said, the correct way to do it is sticking some small pin or paper clip into the back of the connector while it is plugged in right? It's called back wiring right?

Tsrm doesn't say this and I am no match for electrical situations.

 

[hvyman]

JDM

USDM

Notice the prongs for the tps are in 2 different spots.