S-AFC Wiring diagram for OBDII (97-98 240SX)

[drEameRvaJ]

Well I have been searching a lot lately, and I've come across a few different S-AFC 2 installs.

My car is undergoing the "TURBO" stage (so I have no way of knowing if my wires are right or wrong, so I'm trying to correct myself before I start her up) and so I splice into my ECU using the diagram, N-5b from the S-AFC 2 installation manual because a member on here said that, that was the closest to our OBD2 ECU. (Only difference was the RPM is actually one right, one up)

My paper is in my car, but if I can remember at the top of my head, this is how I spliced into my ECU.

Pin 1 - RPM Pin 56 - Power Pin 54 - Knock Sensor Pin 39 - Ground (Two grounds, brown wire closer to ECU, black further down)

And if I go by the N-5b diagram, the white and yellow wires go on Pin 47 (this is the MAF sensor wire) , but I don't know how I'm suppose to have them spliced into the ECU (Splice on to ECU, and run one our the firewall all the way to the MAF?).

If anyone could correct my pin #'s and/or confirm if they are right or wrong for me and tell me how the white and yellow wire (On the S-AFC 2) are suppose to be wired onto the ECU.

THANKS!

[Biggamehit]

what i used for my OBDI ka



just extra

your ecu with pinout

welcome http://www.plxdevices.com/ECUD...9.pdf

[98240]

I have a 98 i just looked in the fsm. You cant go wrong their.

[drEameRvaJ]

I have a 98 i just looked in the fsm. You cant go wrong their.

I don't have a FSM, and have no access to one either. All the sites that are posted are old, and doesn't exist anymore. Unless someone knows of one.

HELP!!

[Biggamehit]

bro N3 b or d is what you want

you don t need a fsm for that

although the ecu layouts pictured looks to be obdI only, they are not. with the link i provided you can find all of those points. all u have to do is make sure when you wire the grounds that they are a about a inch apart on the same ground wire going into the ecu

looks like this

-------------x-------x-------[ ecu ]

and the brown wire has to be closer to the ecu. also if you go to apexi you will be able to download the actually installation manual if you need more help.

but here you go

http://www.zeroyon.com/index/content/view/24/47/


Modified by Biggamehit at 10:26 PM 3/1/2007

[drEameRvaJ]

bro N3 b or d is what you want

you don t need a fsm for that

but here you go

http://www.zeroyon.com/index/content/view/24/47/

I thought N-3B was only for S13's and the site doesn't work (it's suspended).

Let me know. Thanks!

[drEameRvaJ]

"also if you go to apexi you will be able to download the actually installation manual if you need more help."

I went to apexi', there's nothing there for me, and/or my comp. is kinda messed up, it doesn't open some .pdf files, I don't know why.

How is the MAF sensor (white and yellow wire on S-AFC 2 harness) suppose to be wired? I remember reading something Klatt (MOD from ka-t.org) wrote about the MAF sensor, one in the ECU and one out to MAF. I'm LOST about this part.

[Biggamehit]

well i have safc I bro. i never wired safc II

[drEameRvaJ]

Ahh.. Thanks though Bigga.

Can anyone with a 97-98 OBDII ECU confirm my wires for me?

HELP!!

[turbo2nr]

think i get it so the air press. would be some thing like this:

MAFS--------SAFC-------ECU

and stock is just like this:

MAFS--------------------ECU

[Ligouri Rd]

I put this together when I was installing SAFC2 in my Zenki, it should apply to all OBD2 240s. You can ignore the stuff about the camshaft position sensor and pins 40, 41...unless you plan to install Apexi ITC.

Pin 1 - RPM -correctPin 56 - Power -correct Pin 54 - Knock Sensor -correctPin 39 - Ground (Two grounds, brown wire closer to ECU, black further down) -also correct.Wire to cut from Pin 47(MAFS)--------White Wire on SAFC-Yellow wire on SAFC-------Pin 47 For the other ground I spliced another wire on the mass of ground wires that bolt to the chassis next to the ecu. You will also need to tap into the tps, which is pin 23.

[drEameRvaJ]

think i get it so the air press. would be some thing like this:

MAFS--------SAFC-------ECU

and stock is just like this:

MAFS--------------------ECU

Turbo2nr, so by that diagram, I have to splice the ECU wire in half, and connect one wire going into the ECU, and one wire going the other way?

It looks correct, can anyone confirm this?

[turbo2nr]

yup just cut the wire for the maf, the safc intercepts the signal, then alters it and spits it back out to the car

ecu-----........--------car............l.......l............l.......l............lsafc.l(ignore small dots just used for spacing.)

[98240]

I wouldnt cut the wires i were you I would use these. Not cutting is required all youdo is put the wire inbetween the piece of metal and clamp it down. You can get them at a hardware store, Fry's electronics, Or autozone. Those are the places I have seen them. I think they are called tap connectors.

http://www.minute-man.com/acat...0.jpg

or solder the wires in.

[drEameRvaJ]

I wouldnt cut the wires i were you I would use these. Not cutting is required all youdo is put the wire inbetween the piece of metal and clamp it down. You can get them at a hardware store, Fry's electronics, Or autozone. Those are the places I have seen them. I think they are called tap connectors.

http://www.minute-man.com/acat...0.jpg

or solder the wires in.

I knew I was brilliant in a way. Exactly what I used to connect the wires, but on the MAF (pin 47) wire, there's no way I can make one go out to the MAF and one go into the ECU, I have to split the wire like the post before yours to make it work, don't I?

[turbo2nr]

those quick connectors i dont trust them. they can leady to faulty connection and possible fires. i cut and soder all my wires then use black eletrical tape to seal it all, their is nuthing wrong with cutting the wires, just disconnect your battery and you'll be fine.

also you dont want to be driving and you wire for the safc come lose it will mess you up. just cut the wires and do it correctly.

[98240]

I never had a problem with them when I had my safc2. I ran it with those for a year.

Of course soldering is the best way to go. If you decide to solder the wires dont cut them, strip a section of the wire out then solder.

[drEameRvaJ]

I never had a problem with them when I had my safc2. I ran it with those for a year.

Of course soldering is the best way to go. If you decide to solder the wires dont cut them, strip a section of the wire out then solder.

Well I found my solder things so I'll stop being lazy and I'll just solder them so I don't have to worry about anything in the future. =)

Thank you guys! Kouki's ROCK.

[Biggamehit]

yea bro those quick clamps sometimes don't operate properly. just cut and solder man.

[donkayroo]

In

I wouldnt cut the wires i were you I would use these. Not cutting is required all youdo is put the wire inbetween the piece of metal and clamp it down. You can get them at a hardware store, Fry's electronics, Or autozone. Those are the places I have seen them. I think they are called tap connectors.

http://www.minute-man.com/acat...0.jpg

or solder the wires in.

Unfortunately you can not just splice...you have to cut the MAF wire. When you splice you are simply "tapping" into the wire with no intention to modify the voltage from point A to point B. Tapping into the MAF wire with those connectors will bypass the SAFC altogether and the voltage signal will go "untouched" by the SAFC. You will not have the ability to adjust the fuel percentage. It's really very simple. As others have already pointed out...

Once you cut the MAF wire in half approx. 8'' from ECU harness to give you room for error (Pin 47)...- The wire coming from the MAF is to be connected to the white wire on the SAFC. - The wire coming from the ECU must be connected to the yellow wire on the SAFC.

BTW, the correct harness diagram for U.S. spec vehicles can be found of the Apexi website. The PDF is named "S-AFC Vehicle Specific Wiring Diagrams". The problem is, the diagram doesn't outline all the pins needed for the install. It is the correct harness. You can tell just by looking at the shape and arrangement of the pin outs.

http://www.apexi-usa.com/support_wiring.asp

Per Apexi, the correct harness is named "N-1". Just use the link provided from Biggamehit. http://www.plxdevices.com/ECUD...9.pdf

The highlighted diagram from Ligouri Rd has the RPM Pin incorrectly labeled. Simple typo, although both of their documents provide the same info.

Pin 1 - RPM INCORRECT RPM should be Pin 3 (tap into wire)

Pin 23 - Throttle Position Sensor (tap into wire)Pin 26 - Speed Sensor (tap into wire)

Pin 39 - Ground (Two grounds, brown wire closer to ECU, black further down. A two finger distance between is all that's needed. Apexi advises to use Pin 19 for the ground. It's probably to reduce wire clutter on one side so it shouldn't matter)

Pin 47 - MAF (cut wire)Pin 54 - Knock Sensor (tap into wire)

Pin 56 - Power (Apexi advises to use Pin 38 for the power. It's probably to reduce wire clutter on one side so it shouldn't matter)

Hard wiring and heat shrink is the way to go. If this car is your baby don't half *** anything you can do yourself. You might as well practice and attempt to show "professional work" to impress yourself if not others. Soldering is a skill that is often overlooked but silently respected if done well. Playing with R/C cars since childhood makes you a pro.

Just follow the pin outs indicated and you'll be fine. This is exactly how my SAFC is hooked up and it works like a charm. Don't hesitate if you have any other questions.

[donkayroo]

In

I wouldnt cut the wires i were you I would use these. Not cutting is required all youdo is put the wire inbetween the piece of metal and clamp it down. You can get them at a hardware store, Fry's electronics, Or autozone. Those are the places I have seen them. I think they are called tap connectors.

http://www.minute-man.com/acat...0.jpg

or solder the wires in.

Unfortunately you can not just splice...you have to cut the MAF wire. When you splice you are simply "tapping" into the wire with no intention to modify the voltage from point A to point B. Tapping into the MAF wire with those connectors will bypass the SAFC altogether and the voltage signal will go "untouched" by the SAFC. You will not have the ability to adjust the fuel percentage. It's really very simple. As others have already pointed out...

Once you cut the MAF wire in half approx. 8'' from ECU harness to give you room for error (Pin 47)...- The wire coming from the MAF is to be connected to the white wire on the SAFC. - The wire coming from the ECU must be connected to the yellow wire on the SAFC.

BTW, the correct harness diagram for U.S. spec vehicles can be found of the Apexi website. The PDF is named "S-AFC Vehicle Specific Wiring Diagrams". The problem is, the diagram doesn't outline all the pins needed for the install. It is the correct harness. You can tell just by looking at the shape and arrangement of the pin outs.

http://www.apexi-usa.com/support_wiring.asp

Per Apexi, the correct harness is named "N-1". Just use the link provided from Biggamehit. http://www.plxdevices.com/ECUD...9.pdf

The highlighted diagram from Ligouri Rd has the RPM Pin incorrectly labeled. Simple typo, although both of their documents provide the same info.

Pin 1 - RPM INCORRECT RPM should be Pin 3 (tap into wire)

Pin 23 - Throttle Position Sensor (tap into wire)Pin 26 - Speed Sensor (tap into wire)

Pin 39 - Ground (Two grounds, brown wire closer to ECU, black further down. A two finger distance between is all that's needed. Apexi advises to use Pin 19 for the ground. It's probably to reduce wire clutter on one side so it shouldn't matter)

Pin 47 - MAF (cut wire)Pin 54 - Knock Sensor (tap into wire)

Pin 56 - Power (Apexi advises to use Pin 38 for the power. It's probably to reduce wire clutter on one side so it shouldn't matter)

Hard wiring and heat shrink is the way to go. If this car is your baby don't half *** anything you can do yourself. You might as well practice and attempt to show "professional work" to impress yourself if not others. Soldering is a skill that is often overlooked but silently respected if done well. Playing with R/C cars since childhood makes you a pro.

Just follow the pin outs indicated and you'll be fine. This is exactly how my SAFC is hooked up and it works like a charm. Don't hesitate if you have any other questions.