I wish to use this signal to use for my SAFC. I have a S5 TB on my S4 engine and am using the short range sensor with a new plug for the stock ecu.
What wire will give me the voltage or signal for TPS movement?

 

its the grey wire, second plug over on the s4's

http://www.1300cc.com/howto/how2/safc.htm


wait, explain your setup a little bit, your using an s5 tb with the s4 tps right? and you want the signal from it?

 

ive rea that but you dont get what i mean.
The Full range tps from the S5 isnt plugged into anything. Its jsut sitting in my engine bay. ive done this specifically as the S4 tps is crap for this and i wanted a full range signal

what wire ( of the 3 ) do i use for the full range signal

When i put the Digi multi meter across the Blue and yellow wires i get a variable risistance with throttle movement ( same as how you do on a S4 TPS )

How can i convert this reading into a useable one?

 

Yellow is the signal from the S5 TPS. (wide)

And why isn't that a usable reading? The blue wire is ground. Basically you're just checking the resistance of it when it corresponds to throttle movement... which is how to test it.

What's up?

James

 

How do i use it? Just wire that straght into the TPS wire on the SAFC? do i need to put power and earth to the other wires?

Thanks

 

Not sure. I've never used an S-AFC. Didn't it come with Directions?

 

haha,

Yes it does and it say you just tap into the TPS signal wire to the ECU.

Thats fine with the stock system but the stock system some how tranforms the 3 wires that goto the tps into 1 wire going to the ecu.

you see what i mean?

all ive got is 3 loose wires in the engine bay

 

Go here:
https://www.rx7club.com/super-afc-123/

 

the wires going to the TPS are +5v, ground, and signal. its done this way so that the ecu doesnt need to figure out what the resistance is thru some sort of capacitor decay time, it can just read what the voltage on the signal pin is. So you get 0 to 5v on the signal wire depending on where the throttle is. You just want to tap into the signal wire

 

I had better results using the pressure sensor signal for input to the S-AFC.
Since that signal is used by the S-AFC to slide from the low to the high map, following boost rise instead of throttle position can allow more accurate tuning.
On an S4 it's much better than the short range TPS, but even with my S5, I preferred the pressure signal.

Also hooking the blue wire to the pressure signal will give a good MAP display in case the dash gauge is flakey.

I did have a SPDT switch in my connection to toggle between the TPS & pressure sensors, but I used it only to occasionally test the TPS.

 

cheers for the help guys.

So i want to just tap the signal wire to get the signal but i will also need to wire up the +5v and the ground ( probably into the S4 tps wiring )

anyone got an answer to this?

https://www.rx7club.com/super-afc-123/earth-wire-question-659229/

 

I've never seen a series five TPS.

Shouldn't be hard. Let's see. You have a series five TPS on the throttle body and it has SIX sockets and two TPS plungers. One narrow and one wide band.

The series FOUR TPS harness plug has THREE sockets. Three wires. One is Brown/White which is ref voltage. One wire is either pure black or Brown/Black which would be Ground and the third wire is Green/Red (input to pin 2G of the ECU).

So, the Green/Red would go to the upper far right corner socket of the series five half of the TPS PLUG.

The Brown/White would go to the middle socket of the top row of the series five half of theTPS plug.

And the Brown/Black would go to the bottom row, middle socket on the series five half of the TPS's plug.

That should have taken care of the NARROW RANGE OF THE TPS.

Now to make the FULL RANGE work.

You have to splice a wire or two.

At the SERIES FOUR TPS PLUG (on the harness, not the tps itself), you need to splice a wire to the Brown/White wire and run this newly spliced wire to the bottom row, far left socket on the series five TPS's plug.

Then splice a wire from the Brown/Black wire of the SERIES FOUR half of the plug, to the Bottom row, far right socket of the series five half of the plug.

Then run a wire from the top row, far left socket of the series five half of the TPS plug, directly to the SAFC's TPS input.

As usual this might not be clear to you but is to me.

I suggesting the TPS plug has two halves. The series five half that has six sockets and the series four half of the TPS plug that has but three wires.

I'm suggesting you mate the two halves of the TPS plug as I wrote above.

I can't jpg a pictue from where I am right now.

 

******So i want to just tap the signal wire to get the signal but i will also need to wire up the +5v and the ground ( probably into the S4 tps wiring )************************************************* ***************

No. The way I see it, you need to tap the +5vdc and the gnd from the stock series four TPS half of the plug that is a part of your series four car, TO the series five TPS that is installed on your throttle body.

 

The top row of the series five is in this order:
************************************************** ************************************************** ******************************

Top left to right.....B/G........BR/W........GR

Bottom left to rt.....BR/W.....BR/B..........BR/B

************************************************** ************************************************** ******************************

From the stock series four, three socket , tps plug, you run a wire from ITS BR/W to the two sockets above that are BR/W in the series five half of the tps plug.

From the stock series four, three socket, tps plug, you run a wire from ITS BR/B to the two BR/B wires in the series five TPS half of the plug.

Then, just run one wire from the SERIES FIVE half of the plug, from where it is B/G in its top left corner, to the SAFC's input for the tps.

 

On thing I forgot. When I say the series five colors are in this order, that's not quite right. The actual color of the series five wires on the series five TPS side of the plug are not the colors described. But if you had a series five car and were looking at the HARNESS side of the series five TPS plug, those WOULD be the colors.

So forget the actual TPS wire colors (wire colors on the tps piggyback). Just pretend you looking into the TPS half of the plug and pretend the colors are as I described above. And pin as I suggested.

Aw hell, get the series five wiring schematics and just do it. I give up, I'm digging a deeper hole by the minute.

 

Something like this, assuming the series five tps is installed with both it's plungers and the stock series four tps plug on the EM harness is still there:

 

Thanks hailers.

Heres what i did:

I pulled the short range ( S4 ) tps off the bracket and installed a S4 TPS, this was done as the short range S5 plunger was faulty after testing.

I removed all the wires from the S5 TPS plug and got rid of that. ( the plug )

So now im left with a normal S4 TPS and plug to plug into the stock loom. awesome.

Then, from the info above i took the blue wire ( ground/earth )from the S5 TPS and jammed it into the rear of the S4 TPS plug in the black wire ( ground/earth ) socket and it stuck so i tapped it in there so it wouldnt wiggle out.

then i took the orange wire from the S5 tps and did the same thing, back probed it into the 5v ref socket of the brown/white wire in the back of the S4 TPS plug

then i took the Yellow wire from the S5 TPS and hooked it up to the SAFC grey wire via a long joining wire running to the engine bay.

the reason i didnt solder these wires in was due to the lack of space in there without removing the TPS's and throttle body. If i had it out of the car i would have solderd then all in like i usually do. It may not be a good excuse but its all i got.


Thanks for all your help guys.

Peace out

Nath.

 

Heres what i did:

I pulled the short range ( S4 ) tps off the bracket and installed a S4 TPS ( which of course has the correct plug ), this was done as the short range S5 plunger was faulty after testing.
This was done buy folding back the crimping arms underneath removing the S5 short range sensor and replacing it with a S4 sensor and then folding the arms back down to secure

I removed all the wires from the S5 TPS plug and got rid of that. ( the plug )

So now im left with a normal S4 TPS and plug to plug into the stock loom. awesome.

Then i took the Yellow SIGNAL wire from the S5 TPS and hooked it up to the SAFC grey wire via a long joining ( yellow ) wire running to the engine bay.




Then, from the info above i took the blue wire ( ground/earth )from the S5 TPS and stripped back some of the black wire going into the it into the rear of the S4 TPS plug ( ground/earth ) socket and soldered it up - note the solder didnt really want to stick to any of the TPS wires so bewarned, crimping may be your best bet so i tapped it up there so it wouldnt come out.

then i took the orange wire from the S5 tps +5v ref and did the same thing, into the 5v ref socket of the brown/white wire in the back of the S4 TPS plug




at first i didnt solder these wires in was due to the lack of space in there without removing the TPS's and throttle body. then come the next day i went to test it all again and found them coming loose after i had jammed the S5 pins into the backof the S4 plug along side the orginal S4 pins

All done




Thanks for all your help guys.

Peace out

Nath.

 

OK, Scratch that and dont do what i did. I dont understand the full resoning behind this yet but for some reason doing the above stuffed both TPS plungers. I guess you need to run a seperate 5V feed to the S5 plunger or take it from before the plug as now upon testing the ristance is halfed ( 0.5 ohms ) and its blowing out very quickly. I couldnt run my normal boost levels of 11psi and had to run at 5psi to avoid putting any excess load on the system as i was getting horrible spluttering once it got to about 8 psi. this may also have somethign to do with the HKS FCD as i adjusted it all the way to normal as i didnt have any instructions so may have turned the fuel cut way on.

 

OK. Now i come to think about it the spluttering was cause by me turning the HKS FCD to the right ( normal ) setting so what i was experienceing was fuel cut. I didnt test the voltage i was seeing at the ECU so maybe the signal was still getinbg thru fine. Will have to wait and see.

 

You guys need to rethink what makes an S5 tps setup "full range" in comparision to an S4 setup ... It's got nothing to do with the TPS itself .. It's actually a physical diffrence between the S4 and S5 linkages .. In fact, take both s5 tps's and an s4 tps and test the resistance ranges of all 3 .. you'll find they are all the same ...

Easiest method would be for you to tap into the boost sensor instead of the TPS with your S-afc..