Need help wiring S-AFC
 

Sorry to cross post but this board gets alot more views and I would like to get this done tonight.

well I have the 1st gen model but I am pretty sure its all the same stuff when it comes to wiring. A friend and I looked through the mazda shop manual for about an hour and had a hard time finding the leads we needed. If anyone could tell me which wires are which coming off the ECU that would be great. I need...

IG Power
Air Flow Ground
RPM Signal
Air Flow Output
Air Flow Input

On the diagram it looks like you use the Air Flow Signal wire and treat one side as the Input and the other as the Output. But we are pretty sure we found seperate wires for the Input and Output. If anyone could clarify this that would be great.

Thanks for all your help guys, I really appreciate it.

Take a look at all of the ECU pinout Jpegs for the different cars in this link, see if that helps you any

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/troubleshooting-your-car-ecu-340578/

And AFAIK, the AFM input will be the 5 vdc reference voltage outputted by the ECU, and the output will be the actual AFM signal...

Actually I'm pretty sure it's not. Compared to a 2nd Gen it'll have a different ECU with different pin-outs.

You need a FSM or ECU printout for the first generation car. I'm SURE that it exists on the 1St Gen Forum...somewhere. There's no way you can look at a 2nd gen ECU printout and use it for your 1st gen.

There seems to be some confusion here. The SAFC has a WHITE WIRE. You connect that wire to the OUTPUT WIRE FROM THE AFM. What you do is INTERCEPT that wire coming from the AFM and now it goes to the SAFC instead of the ECU.

The SAFC has a Yellow wire. That YELLOW wire is now the afm's input signal. So you now end that wire at the ECU where the original afm wire was.

The SAFC black and brown wires are attached to ground. The folk at the SAFC factory say that those wires should be grounded to an alreedy existing ground wire at the ECU. They also state that the Brown ground wire should be closer to the ECU than the Black ground wire.

Tell me, is your problem that you don't have a SAFC install manual??????????????? With the wiring diagram????

I did a search on this forum. I went to the first generation. I went to SEARCH. I wrote FACTORY SERVICE MANUAL. I did the search in only the 1st Gen. About the tenth thread, give or take a few threads, there was a reference to a site where the FACTORY SERVICE MANUAL for a 1St Gen exists. I downloaded the ELECTRICAL WIRING section. I DID NOT download the FUEL section. It takes to long and I ain't got no dog in this hunt.

The wiring shows that the TPS uses a green/red wire at pin G.

The AFM output is on pin Q. It is a Light green/Black wire.

So you'd take the Lg/B wire at pin Q on the ECU, and cut it several inches back from pin Q. You'd splice your SAFC WHITE wire to the part of the Lg/B that comes from the afm.

Then you'd splice your SAFC YELLOW wire to the part of the Lg/B wire that comes from the ECU at pin Q.

You'd take the SAFC's GREY wire and attach it to the Green/Red wire that goes to the ECU's pin G. You don't cut the Green/Red wire to do that. You can just get a razor blade and strip the insulation off the Green/Red wire several inches from the ECU, and solder the GREY wire to that bare spot in the Green/Red wire, then cover it with some insulating material of your cholce.

I know not how many plugs are on a series 1Gen ECU. The wiring diagram said pins G and Q. Most Mazda ECU plugs read with the connector connected up and you look towards the ECU and count in a up/down fashion, from THE RIGHT TO THE LEFT.

The speed signal is on a Black/Red wire at pin little H or h on the ECU. I doubt there are more than one Black/Red wires at the ECU. If there are, then YOU have to determine which is little h. Not big H but little h.

Go here http://www.wankel.net/~krwright/cars/rx7/85_manual.html to download the FSM for that car (Series One/Whatever). Either the Fuel section(4B Fuel and Emissions) or the wiring section at the very bottom.

I think he meant he had a 1st gen S-AFC, not a 1st gen RX7. It says he has an 88 in his sig, i could be wrong tho

lol.
gosh guys, pay attention. plus i have a free safc2 i just got. i could scan some pages in the book if that helps any.

thanks for the help guys. yes I did mean the 1st gen S-AFC not RX7. Sorry for the unclarity. I was able to figure it out eventually with help of a friend and picking through the factory wire diagram. I had even more problems with the AVC-R but I think I have that working now. I am just not sure how to set it up haha.