i just installed my s-afc 2 and the afl and thr is reading off, could it be the TPS, because my friend checked out my TPS and its broken, he said it aint reading right, my afl reads less than 9% and my thr is always reading like 50% or higher..and when i slightly like really slightly tap the throttle it reads 100% so im guessin its the TPS but just makin sure, if anyone knows anything else thats wrong

 

make sure the settings are right on the SAFC and if they are then its probley your TPS

 

Well if its a Series 4 car then at something like 25% throttle (dont quote me on that) its reading 100%. Mine did the same thing when i had it on my S4 N/A, it would read the throttle position off.

 

It's not reading the throttle position "off", it's just that the S4 TPS (and the S5 narrow-range TPS) only measures the first 15deg or so of throttle opening. That's all it's meant to do, so there's nothing you can do about it.

 

When i said "off" i didnt mean "open". I ment it like it was miscalibrated. Like "the meter was reading off". sorry for the misunderstanding.

 

ok so even though the thr goes down to 29% after i drive after a few mins then again it goes back to 50% its not stable...im just tryin to get this correct so its when im driving around its just gonna read the 1st 15deg or so...so that xplains the different thr % when im driving around??just wanna make sure im understanding this right

 

what are the settings for the S4??my friends who helped me have S5s and we didnt know if it mattered so we just used the S5 settings

 

It matters, the S4 TPS isn't full range. Do a search for SAFC-II on the site and you'll find information on it. Also, you need to make sure your TPS is working correctly, if it's not (as you said) then you need to have it replaced.

 

I have no idea what you're saying...

It should read close to zero when the throttle's closed, it should move between 0-100% during light throttle driving, and it should read 100% whenever you go past ~25% throttle.

 

adjust your tps, easy way with the safc is to go to the part where you can read the sensor voltages and read the throttle position voltage and set the tps so that the safc reads about 1 volt or a little less at closed throttle

 

Listen to the words of the man in the quote above. And when you do set the TPS make sure the car is fully HOT.

And after you have set the tps, don't get in a dither when you go out to the car the next morning and the tps reads 2 plus volts instead of the 1 volt you set it at the previous day. The tps voltage will go back to 1 volt when you warm the car up.

Next time you post, it might help if you state what series car/year car you have. It's not in your profile.

And for what it's worth, although the tps reaches its full extended position just about the same time the secondary throttle plates open.........when crusing along the hiway, you'll find that the tps is NOT fully extended if your under approx 65 mph in fifth.

 

yeah i didnt state what kind of series i have til like my 2nd or 3rd post...my bad

 

ok, thats what i mean, its reading it WRONG, once i start the car its reading like 50% or above, and when i slightly tap the throttle it goes straight to 100%, and when i drive the car around it goes down to 23% then goes up to 40% then goes back to 50%+, understand what im tryin to say now? i think its the TPS, im just tryin to clarify it with you, sorry if its kinda confusing i hope you understand now

 

I don't get what the problem is. It sounds like it's reading the TPS perfectly.

Just so I'm totally clear, you realise you're measuring throttle position, which changes every time you move your right foot. Coz it sounds like you're expecting to see a fixed value or something. Sorry if I'm misunderstanding you.

 

the S4 settings are different from S5. your flap should be set to 5 in 5 out. not 6 / 6 like the S5.

I doin't think that will fix your tps though.. only airflow. which should be around 1-2% at idle and 50-70% at WOT high rpm.

throttle should be 0 when your foot is off the gas. 100% at 30% throttle. and 50% at 15% throttle. and everything in between.

 

Ok. Just for you, I went out and took my Grey wire of the SAFC off the pressure/boost sensor output and put it on the TPS output (Green/Red wire on the ECU).

With a fully warmed up car (180 degrees and it aint celcius), I turned the engine off and then the key back to ON.

Now I went to ETC and SENSORS. There I see the TPS voltage is 1 volt (if it is NOT, then adjust the TPS screw til it reads 1 volt).

Now while watching the SENSORS, I step on the pedal all the way and now the voltage rises to and reads 4.555 volts.

Now I page back on the SAFC and go to MONITOR. With the key to On, and my foot off the pedal, engine not running, I see 7.7 percent! EEEEEEEEEEKKKKKKKKKKK!!!!!!!!

So I know that is wrong and I go read the instruction book. Now I go to ETC and page down to INITIALIZE. I press the word YES to INITIALIZE (puts all inputs back to the initial settings from the factory)

Now I calmly reset everything. I go to the ETC mode and go to SENSOR TYPE and enter FLAP.

Then I go to SENSOR NUMBER and put in 05 05

Then I go to CAR SELECT and put in CYL 4 and the ARROW to point UP and to the RIGHT.

NOW I go back to MONITOR and go to THROTTLE SENSOR and guess what???? It reads ZERO percent as in 0 percent. And when I step on the pedal it reads 100 percent.

So do as I did above. Go to SENSORS. Look at the TPS voltage. It should be 1 volt. If not then adjust the TPS screw til it reads 1 volt.

Then go to ETC and step down to INITIALIZE and hit the word YES!

Now reset the SAFC by going to what I did just above. FLAP, 05 05, CLY 4 and whatever else I wrote above.

I just did this procedue this last thirty minutes.

 

The lesson I learned from the above is that if the tps reads other than zero percent with ones foot off the gas pedal........and the tps voltage output is set to 1 volt.....that you need to INITIALIZE the SAFC and start over. It took all of five minutes to reset the SAFC (I'm slow).

So

 

And the third lesson I learned is...

After I wrote the above I went out and started the car. The percentage reads 1.6 percent. SAY WHAT! So I go look a the sensor voltge. It reads like 1.075 volts. HUH ??? Not 1 volt???? It turns out that with the key to just ON the voltage reads less.......with the engine running and the alternator putting out it reads higher.

Lesson......set your tps with the engine running and the engine fully HOT.

 

thanks man, sorry for the trouble, i know what i should do now