This took me a few days to find, and I got it from someone else so I thought I would share
----------------------------------------------------------------
The S-AFC is used by a lot of fellow 2JZGE-T owners. While some use just the S-AFC2 and their MAF, others do the S-AFC2/VPC combination and ditch their MAF.
You must also note that the 1992-1995 SC300s, will wire up differently than those that are 1996-1998. This is due to the earlier models (92-95) being OBD1, while the older models (96-98) are OBD2.
----------------------------------------------------------------
Go to the passenger side of the car. On the right side of the floor is a black plastic cover held in by a wedge screw. Push on the middle of the screw and pull it out, then pull out the side piece which is part of the door trim--it just pulls out and snaps in. Once that is removed, pull back the carpet which will expose the ECU protective shield (the carpet is held in by two plastic screw wedges at the top). Use your sockets to remove the two nets holding the shield down and remove the shield. The ECU should now be exposed. (The ECU is on the left side and the ABS ECU is on the right side, so you won’t need to take the right one off.) Remove the last nut that is holding the ECU down. Then slip the end over the screw and pull the ECU down and it should be free. The top part of the ECU harness and can be removed by pinching and pulling on it. The bottom harness needs to be unscrewed to be removed, either with a screw driver or with your sockets. After unscrewing the harness pull it off the ECU and set the ECU out of the way. You may need to remove some electrical tape that is binding the wires, so you have complete access to them.
----------------------------------------------------------------
Now you can get started wiring you S-AFC2. Before we begin, you have to note the change between OBD1 Sc300s, and the OBD2 SC300s.
----------------------------------------------------------------
The OBD1 1992-1995 SC300will use the KARMEN Vortex sensor.
The OBD2 1996-1998 SC300 will use the HOTWIRE sensor.
----------------------------------------------------------------
***************FOR OBD1 (1992-1995) N/A's**********
-Use PINK wire, instead of YELLOW wire.
-Use ORANGE wire, instead of WHITE wire.
-YELLOW and WHITE are NOT used in OBD1.
----------------------------------------------------------------
IF YOU ARE OBD2, FOLLOW THESE STEPS EXACTLY AS THEY ARE WRITTEN. OBD1 READ DIRECTLY ABOVE FOR CHANGES YOU MAKE.
----------------------------------------------------------------
1. Splice the GREEN wire (rpm) into 58.

2. Splice the GRAY wire (throttle) into 43.

3. Cut wire 66 in half, leaving yourself enough room to connect a wire to ECU harness.

4. Connect the YELLOW wire to the 66 wire connected TO the ECU harness.

5. Connect the WHITE wire to the 66 wire heading AWAY from the ECU harness.

6. Splice the BROWN wire (ground 1) into 69, close to the ECU.

7. Splice the BLACK wire (ground 2) into 69 at lease 1cm away from the BROWN wire.

8. Splice the RED wire (12V+) in the ECU wire 31.

9. PINK and ORANGE wires are not used.
----------------------------------------------------------------
Ok, now you have all of the wiring done, double check all of your connections, reconnect the wiring harness to your ECU. Make sure all of those wires are still tight. Plug the harness into the S-AFC2. Reconnect your battery cable. Turn the ignition to the ON position. The S-AFC2 should boot up and display the A'PEXi, if the screen did not light up, stop, disconnect the battery, and find out what went wrong. Most likely it is a power or ground problem (or a loose ECU harness).
----------------------------------------------------------------
If the unit powers on, follow these steps:
First start off by resetting the S-AFC2. Many have often complained that their S-AFC2 does not show full throttle(%100), regardless if it is brand new, go under [ect.] and press NEXT~>. confirm "YES" when prompted "Init. All?" and press NEXT again, Now turn the ignition OFF and then back ON, and the unit should now be reset and ready.
----------------------------------------------------------------
Next enter the following basic settings:
1. Go to [main]~> [ setting] ~> [3. TH-Point] ~> [Lo-94, Hi-95]
2. Go to [main]~> [ect.] ~>[1. Sensor Type] ~> [Hot - Wire] ~>[in-12, out-12]~> [in-1, out-1]* (SELECT KARMEN IF YOU ARE 92-95)
3. Go to [main] ~> [ect.] ~>[2. Car Select] ~> [Cyl:6, Thr:UP]
4. Go to [main] ~> [ect.] ~> [3. Graph scale] ~> [Ne=7000RPM]
5. [Ne-POINT = 3500, 4000, 4500, 5000, 5500, 6000, 6500, 7000]
[Dec. -Air = NOT USED, unless you want to use it to compensate for venting your BOV to atmosphere]
----------------------------------------------------------------
Do not modify the low throttle settings. While at low throttle (in closed loop mode) the ECU will counteract any changes made and over time your long term fuel map will be modified. I recommend modifying your high throttle fuel curve on the Dyno with an air/fuel ratio meter & egt gauge installed. For maximum power, one probably wants to run an air to fuel ratio between 11:1 (rich) and 12.5:1 (lean). Do yourself a favor and pay a professional to tune it. IF you lean your engine out, things can get melted.
----------------------------------------------------------------
BLUE WIRE MOD INFO

This allows you to read Oxygen Sensor Voltage on the S-AFC2 display. On the wiring harness for the S-AFC2 the blue wire is not normally used. The blue wire is meant for the second Mass Air Flow Meter on a Nissan 300ZX. You will connect this wire in the O2 sensor wire right at the ECU. To read the O2 sensor voltage, scroll down to and select the "ect." menu. Select the "Sensor Check". Of the three readings, O2 voltage will be the middle one (#2)


Hope this helps!
PICS OF IT WORKING (following these directions!)

 

wow , nice job

 

nice write up i am adding this to my subscriptions list

 

nice work, its very possible i'll need this info very soon

 

Great writeup here. I'll refer to this if I ever need to use an SAFC.

 

Thanks for the write up. I actually need this info now.

 

thanks guys. It took me two hours to write LOL. But yeah it's a pretty good one. If I do say so myself

 

I must say that this peice of equipment is amazing. i love every single aspect of it. I highly reccomend it. I found it for a good price and just bought it for the hell of it, but I must say its a must. It tells you everything. From knock, to RPM, which im assuming the ECU is correct, so my RPM gauge is off..

 

Thats pretty cool. My NEO doesn't have knock. Any daytime pics of it mounted? Its in the ashtray correct?

 

nice write-up

copied and saved in my archives...

 

If i'm correct, i think you got that from Supraforums.com. one correction; 98+ doesn't fall under these instructions. If you have a 98, do yourself a favor and follow the IS300 or 2nd Gen GS300 diagram. 98+ are completely different, I was pretty much on my own installing my SAFCII on my 98 before i found out they use the same ECU as the IS and GS...

 

Its actually not mounted in there, its just sitting for now. i need to get it mounted but thats for the future.

As for the correction...my bad and no this is not from supra forums. may have been posted there, but they dont have many SC sections.

 

I cant belive that after I get this thing installed not even a week later my stupid suspension failed me. Gah. I have to say I love this thing tho!

 

so what actually failed in your suspension. you still havent given a clear cut answer. was it the shock, the control arm9doubtful, or the subframe?

 

does anyone have something like this for the 99 sc300, i see its not listed. i need to hook up my greddy emanage ultimate.