tuning problem.

[HOYS]

First, is your floor mat interfering with your gas pedal? Have a buddy press the pedal to WOT and see if you can move the linkage on the TB to see if it opens more.

Past that: The sensor or signal wire to the TPS is the center wire (iirc, double check me on that) and you will have a low voltage reading of around .4 volts coming out with key on and 0% throttle. WOT will be around 4.9v (you can do this test with key on and engine not running)

Check to see both of those values are what you get from the signal wire.

If there is some problem, make sure you are getting 5V through the other wiring.

If that checks out then pulse or tap the pedal and then slowly increase from 0% to 100% to check out the voltages and see if they correlate to the actual throttle position.

If the signal coming out of the TPS (aka all of these checks) are good then you are looking at faulty wiring to the PCM or a bad PCM.

Next step would be to check the signal wire at the PCM (I can't tell you the pinout as I don't have SI in front of me ATM).

Thats the jist of it... sorry not so great at typing at the moment

[sleepyalero]

dang.... well i went on a drive.. again, could only get the tps up to 84 percent at wot. when pedal was still to the floor once the tps went to 84% it just dropped to zero while i was still WOT. 84 was highest i could get it, other times it would reach 78.


what about a bad crank position sensor?



heres when i floored it, went to 78% then dropped while pedal was still down.

[HOYS]

Originally Posted by sleepyalero

dang.... well i went on a drive.. again, could only get the tps up to 84 percent at wot. when pedal was still to the floor once the tps went to 84% it just dropped to zero while i was still WOT. 84 was highest i could get it, other times it would reach 78.


what about a bad crank position sensor?

TPS is based on the voltage coming out of the TPS sensor. Thats it n' thats all. I do think HP tuners can log the voltage PID that the PCM sees from the TPS as well.

[sleepyalero]

above post edited, with picture..

true, but i have had some wacky idle/random high rpm where it wont come down. everytime i have the damn tuner plugged into the car scanning i can never get it to do high idle.

[HOYS]

Originally Posted by sleepyalero

above post edited, with picture..

true, but i have had some wacky idle/random high rpm where it wont come down. everytime i have the damn tuner plugged into the car scanning i can never get it to do high idle.

Do you have any other scan tools or gauges hooked up to the data line when you are using HPT?

[sleepyalero]

Originally Posted by HOYS

Do you have any other scan tools or gauges hooked up to the data line when you are using HPT?

nope.

[HOYS]

Originally Posted by sleepyalero

nope.

Any of your VCM controls enabled like IAC PW or Target Idle?

[sleepyalero]

Originally Posted by HOYS

First, is your floor mat interfering with your gas pedal? Have a buddy press the pedal to WOT and see if you can move the linkage on the TB to see if it opens more.

Past that: The sensor or signal wire to the TPS is the center wire (iirc, double check me on that) and you will have a low voltage reading of around .4 volts coming out with key on and 0% throttle. WOT will be around 4.9v (you can do this test with key on and engine not running)

Check to see both of those values are what you get from the signal wire.

If there is some problem, make sure you are getting 5V through the other wiring.

If that checks out then pulse or tap the pedal and then slowly increase from 0% to 100% to check out the voltages and see if they correlate to the actual throttle position.

If the signal coming out of the TPS (aka all of these checks) are good then you are looking at faulty wiring to the PCM or a bad PCM.

Next step would be to check the signal wire at the PCM (I can't tell you the pinout as I don't have SI in front of me ATM).

Thats the jist of it... sorry not so great at typing at the moment

throttle doesnt move anymore when pedal is to the floor.

i dont have a digital multi meter, cant really figure out how to use one either, just watched a video and im like wut. but i tried all different ways in the sensor plug and the needle didnt move at WOT with the key in the ON position. (analog multi meter)

[sleepyalero]

Originally Posted by HOYS

Any of your VCM controls enabled like IAC PW or Target Idle?

please elaborate. im new to this .

[HOYS]

Originally Posted by sleepyalero

throttle doesnt move anymore when pedal is to the floor.

i dont have a digital multi meter, cant really figure out how to use one either, just watched a video and im like wut. but i tried all different ways in the sensor plug and the needle didnt move at WOT with the key in the ON position. (analog multi meter)

Get one at Harbor Freight for cheap. Its a must have. I have 4 (all in different states of repair).

You can get piercing probes that will tap into the wire where ever you want. Be careful as they might cause corrosion as the wire is now uncoated where you pierce them with those probes. Simple way is to take a paper clip, un fold it, stick it into the weather seal on the pin you are trying to probe. Clip onto this with an alligator clip and there is your tap into that connection.

Originally Posted by sleepyalero

please elaborate. im new to this .

This is what the VCM Controls menu looks like...ish.

[sleepyalero]

Ill will come back in a sec for that post above. Going to do a quick scan run and get tbell.

But found out i can read voltage through hpt on the tps.

Key ON 0% throttle. - .69/.71

Key ON 100% throttle. - 4.59/4.61

It keeps hopping between those numbers.

[sleepyalero]

This is what shows, some i cant even click.

Sorry cell pic

[HOYS]

I think the IAC stuff and idle control is either under special or fuel and spark iirc.

You don't have an exhaust brake or variable manifold....etc...so that s why you can't click some

[sleepyalero]

okay just got back, i will look at that in a sec hoys. the throttle is now reading back to 50% at full throttle when car is in ON position.

when floored driving the highest the TPS voltage went to was 3.28 at WOT once it reached that it went to 0.00 when i was still going WOT.

highest while driving % wise was 80. but i just got back to fisdads shut car off and put pedal to floor, it only reads 50% again... wtf.

[sleepyalero]

screen shot of special

[HOYS]

Wow they really haven't fleshed out the Alero .bin files at all! I always see GAs having IAC control.

Either way you need to check the voltage AT the sensor, not just what the PCM reports. If you feel fancy and have HP tuners pro you could wire the splice from the signal wire into one of the analog inputs on HPT and make it as just a 0-5v input, log it versus what the PCM reports as voltage

[PhantomLover007]

How is it using the HTP scanner Nathan? Is it pretty easy?

I remember that you couldn't do certain thing like you could w/ the other tuner. Is it still true?

I've been sitting on the fence about getting one because of this...

[sleepyalero]

idk if i want to do that!

guess ill have to obtain a volt meter, aside from that, anything else i can do? maybe i can call milzy sometime soon, see what he says as well.

[sleepyalero]

Originally Posted by PhantomLover007

How is it using the HTP scanner Nathan? Is it pretty easy?

I remember that you couldn't do certain thing like you could w/ the other tuner. Is it still true?

I've been sitting on the fence about getting one because of this...

well i dont know the difference between hpt and the "other" tuner, but im new to hpt but it seems like you can do quite a bit, milzy uses it in his shop so i assume its a good program to use.

[PhantomLover007]

Ok cool. Too bad you and Aaron aren't near each other or you guys could compare them