Torque pro question again, started it's own thread WRT TPS data.

[mrbreezeet1]

I remember on the older OBD1 scanners, circa 1985, when plugged into the ALDC under the dash, TPS was shown on the scanner itself as A voltage, ~ 1/2 volt at idle to ~ 5 volts at full throttle.
In Torque Pro app, it shows the TPS value in percentage, not in volts. I looked and looked in the torque app settings and can't see anywhere to assign the display to read in volts. Do you know if it's possible to make/set up torque pro to display TPS readings in volts instead of percentage?

 

[eljefino]

Maybe thats how your computer reports it to torque. Instead of using a rheostat they might use an optical sensor or ???

 

[mrbreezeet1]

Maybe thats how your computer reports it to torque. Instead of using a rheostat they might use an optical sensor or ???

No, It's a 3 wire rheostat. I think it is what it is, I don't think it's possible to set it to read volts.
I'd have to use a multimeter to read the volts at the TPS.

 

[chemman]

I did a little digging into my Torque Pro and Throttle Position Sensor is only reported as a percentage.

 

[mrbreezeet1]

I did a little digging into my Torque Pro and Throttle Position Sensor is only reported as a percentage.

Thanks bud! That's about what I thought! I was looking at a better scanner{s} but IDK if I can justify the cost since I'm retired. Based on what I've found so far, getting ready to load the cannon up!

Recap of my other post WRT my issue.

2001 Grand Prix with a 3.1-liter motor, started idling high after good and warmed up. No codes at the time. When motor would idle too high, 4T65E trans would shift super late under light throttle. About 25 MPH and 2,500 RPM before it would hit 2nd. gear. Was OK the next day. 3rd. day, high idle and late shift again!
This time the check engine light did come on. Code P0121. Scanner TPS angle percentage at idle shows 0 sometimes, and sometimes 0.39% and ~ 100% at WOT. One time while sitting there idling fine, ~ 700 RPM, all at once the idle kicked up to ~1,300 RPM all by itself. I looked at the scanner, now TPS angle percentage went up to 2.75%.
From my scanner readings, it looks to me like the sensor IS receiving the 5V reference, and my ground is good, and my reference voltage is changing and being sent back to the ECM. My voltmeter is at my buddy's garage right now, so I could not do any voltage testing at the TPS connector.
I'm ready to take a chance based on my findings, and just install a new TPS.








Reply

 

[mk378]

Key on but engine not running, watch the TPS percent as you very slowly press the gas pedal from zero to full. It should increase smoothly. Any jumping around is a bad TPS. Also wiggle the wires on the TPS while watching if the percent jumps, that could be a bad connection.

The percent number is computed linearly from volts, you can do the reverse conversion if you would rather think in volts.

 

[chemman]

Just in case you need a little assistance:

How To Test The Throttle Position Sensor (GM 3.1L, 3.4L)

GM 3.1L, 3.4L Index of Articles

easyautodiagnostics.com

Good Luck!

 

[mrbreezeet1]

Also wiggle the wires on the TPS while watching if the percent jumps, that could be a bad connection.

Thanks mk378
You know, I told my self do that, before I unplugged everything, but I got ahead of myself and started to change it out.
Got the top screw out OK but it was getting to where I could use a little more daylight to get the bottom screw out.
I could have used my work light too, but my back bothers me too much if I stand too long, so I came up for the night.....

Just in case you need a little assistance:

How To Test The Throttle Position Sensor (GM 3.1L, 3.4L)

GM 3.1L, 3.4L Index of Articles

easyautodiagnostics.com

Good Luck!

Thanks chemman too.
You guys are great!

 

[SHOZ]

On my Gen Coupe the TP% is roughly equal to the angle of the throttle plate.

 

[mrbreezeet1]

On my Gen Coupe the TP% is roughly equal to the angle of the throttle plate.

At Idle?
I wish I could have got the darn thing done today. Well, that's OK. I got a call I wanted to take, so I had to quit working for a while. I'll probably know more tomorrow.

 

[SHOZ]

At Idle?
I wish I could have got the darn thing done today. Well, that's OK. I got a call I wanted to take, so I had to quit working for a while. I'll probably know more tomorrow.

At WOT. idle is around 15% or so.

 

[mrbreezeet1]

Oh wow! Thanks,
Interesting! mine are way different than yours, as posted above. WOT was showing ~100% but again, my Idle
was....................Well

Scanner TPS angle percentage at idle shows 0 sometimes, and sometimes 0.39% and ~ 100% at WOT. One time while sitting there idling fine, ~ 700 RPM, all at once the idle kicked up to ~1,300 RPM all by itself. I looked at the scanner, now TPS angle percentage went up to 2.75%.

Im curious what they might with Torque Pro after installing the TPS!

 

[mrbreezeet1]

I'm curious what the readings might be with Torque Pro after installing the TPS!

Curiosity killed the cat! SOS if not worse, now with a Pending P0101 code.
Can anyone of you all look at these screen shots from Torque Pro and see if you all can make any sense of any of them?

RPM TPS% Temp and MAF are shown. All RPM readings are with accelerator pedal at rest.
KOEO with accelerator pedal at rest TPS % was/ls 0.

 

[mrbreezeet1]

Key on but engine not running, watch the TPS percent as you very slowly press the gas pedal from zero to full. It should increase smoothly. Any jumping around is a bad TPS.
Also wiggle the wires on the TPS while watching if the percent jumps, that could be a bad connection.

That part looks good!

Still need go do this.

Changed the TPS still having Issues, and now a "pending" code PO101.
Can you please look at my screenshot's and see if you see anything out of order.
Also KOEO gas pedal at rest, TPS % is 0. KOEO gas pedal at WOT, TPS % is at 100 %.
I did clean the MAF sensor yesterday but didn't reinstall it yet, but TBH I don't think that's the answer.

 

[SHOZ]

Engine runs too hot IMHO.

 

[mrbreezeet1]

Engine runs too hot IMHO.

l thought it might be a bit high. But normally around town and on the highway, then back in town she runs considerably cooler. And when it started having these issues, my temp was normal. Honest it was.
I'm getting inconsistent TPS readings tonight ran and shifted normal most of the night, until it didn't!
I'll compose a post here in a bit with new screen shots!
I know it needs a flush and I'll change the T-stat at that point too!
Thanks!

 

[mrbreezeet1]

Engine runs too hot IMHO.

Yeah, you're right the temp is getting up there at times. I need to make sure my fans are coming on too.
I know I heard it kick on the other night.
However, car ran perfect most of the night till I was almost home.
And I am still, IMO, getting wonky {inconsistent} TPS reading at Idle, especially when the Idle takes off, and I did not touch the throttle.
To Wit, car was idling with normal RPM's in the driveway, with a TPS reading of 0%.
Idle took off on its own, {I didn't touch anything} and at the same time, TPS reading jumped up to about 25-30%.
I immediately shut the motor off, and with KOEO, TPS stayed at 25-30%!
I next mashed the pedal to the floor, and released it two times, BAM! TPS came down to 0% as pretty as you please.
I'm going to have AZ defect out the TPS I already explained the latter to him, and he agreed.
I also did a wiggle test to the TPS wires at the connector when it was high idling, with no changes.
I mean, IDK what else to think, unless I have some sort of intermittent ground being sent from the ECM?
Hope this makes sense, I can upload a few screen shots if you want too, but IMO {of course.....LOL} my text explains my findings pretty well.