Any 240sx guys here have an SAFC II? I need help!

[240sxDann]

So I installed my AFC NEO following instructions from ka-t.org. I got everything buttoned up, connected my battery, and started my car. It started up just fine. However, when I'm on the monitoring thing on the NEO, it is saying 0.0 battery voltage. I did not hook up the orange wire yet though, could that be the problem? Well either way, my bigger issue is that now it won't rev past 2500 RPM. I know that its either the MAF wiring, the in/out settings, or the NEO itself is messed up. I tried basically every in/out combo from 1-28, and if I reconnect the white MAF wire on the ECU, it runs fine. Just trying to get prepped for boost come spring!

[drifty240]

SOunds like you didnt wire it correctly... check the part on the maf....

SAFC II - KADE ECU
White wire - ECU pin 47 - white wire - MAF Signal Input from MAF (You actually cut the
ECU's wire in half)
Yellow wire - ECU pin 47 - white wire - MAF Signal Output to ECU*
Grey wire - pin 23 – white - TPS
Purple wire - pin 54 - white wire - Knock Sensor
Green wire - pin 3 - yellow/red wire - Tach Signal
Red wire - pin 56 - black/white wire - Power
Black wire - pin 48 - black wire - Ground (Further from ECU 1cm from brown SAFC II)
(wire)
Brown wire - pin 48 - black wire - Ground (closer to ECU 1cm from black SAFC wire)

Here we have the OEM Pin location :


And here is where most of the pins go :


only one thats missing is the knock sensor, which is pin 54.
all of this information was tested and proven to be correct as i'm running it right now. be sure to solder all connections. and happy tuning.

wiring the maf is a little tricky when your reading it, put once you see it in a picture its easy. so here you go, pardon my paint skills:

[240sxDann]

yea man thats exactly how I'm wired. What in/out settings are you using? I really appreciate the help!

[drifty240]

I have a tuned ecu and z32 maf so mine is 1 and 1 but do some searching on www.ka-t.org... I think if with a ka maf ist 5 in 5 out. DO a sensor check and tell me what have.

I would try 2 in 5 out...

[240sxDann]

I was seeing like .03 in and somewhere around the same out. Basically regardless of what in/out setting it was on. I'm so confused. I literally tried every single in/out combo, and nothing will even get it to idle right, unless I disconnect the neo wires, and reattach the MAF wire to each other. Then it runs perfectly fine?

[drifty240]

Originally Posted by 240sxDann

I was seeing like .03 in and somewhere around the same out. Basically regardless of what in/out setting it was on. I'm so confused. I literally tried every single in/out combo, and nothing will even get it to idle right, unless I disconnect the neo wires, and reattach the MAF wire to each other. Then it runs perfectly fine?

are you sure you have it set for 4cy? I would resit the neo and start over. Also make sure you have the correct wires going to the maf and the one going to the ecu.

[240sxDann]

I tried doing the "initialize" but it just sat there and didn't do anything for a few minutes....thats bad isn't it?

[drifty240]

Like i said, i have an safc not a neo so i am not sure if thats bad. Have you posted on ka-t.org?

Check your grounds and anything else you have changed. If your car runs without the neo being plugged in it has to be your wiring or settings? When you change the in and outs does it do anything?

[240sxDann]

As far as I know, the SAFCII and the AFC NEO are the same in that sense, its just that the NEO does tuning and vtec control. The only thing I've gotten out of the in/out settings is that certain ones will make it so that it will rev to like 2500, then cut and drop to 1000 then rev back to 2500, etc. What its doing is just breaking up extremely badly under light throttle, and under full throttle it revs to 3k, then cuts out till it hits 2500 then it sounds like a 2 step at 2500, just bounces.

And yes I have posted on ka-t.org, I'm on there a lot. love that site!

[drifty240]

Really sounds like not getting any input from the maf... check the wiring

[240sxDann]

I'm going to use a jumper on the neo harness without the neo plugged in. Jump the yellow/white wires on the plug, which would be the MAF wires, and see if the car runs ok. If it doesn't, I will redo the wiring on the harness end. If it does run ok though, who knows, I may have a bad neo? Or I'm not setting something right. We'll see. It's gonna have to wait until tomorrow though I guess. I really appreciate the input, thanks man!

[frosti108]

dan what did you follow to wire yours up? post up whatever you were looking at.

besides wiring... your in-out should be somewhere between 1-1 and 6-6. and dont limit it to just a 1 as the in. it can definatly be something like 3-5 or 4-6 ... what mafs are you using?

[240sxDann]

http://www.ka-t.org/forums/viewtopic...fc+neo+install

Thats what I followed and according to the pinouts, should be correct. Right now I just have a stock MAF. I am going to experiment with it tomorrow to see what I can track down in the wiring, so we'll see. I'm HOPING its just not a good connection or something but we'll see.

[240sxDann]

UPDATE! I used a small jumper on the harness to jump the two wires for the MAF, car runs perfect. I'm getting like .03 in and like .07 out, but I'm still reading 0.0 for battery volts (wtf?) and like .04 for ignition voltage? Does this have something to do with that orange wire, because my neo lights up without it hooked up? Also, when I try to do the "initialize" the buttons turn blue, and it just freezes. Is this bad? lol. I really appreciate the help guys!

[TurboTagTeam]

Originally Posted by 240sxDann

As far as I know, the SAFCII and the AFC NEO are the same in that sense, its just that the NEO does tuning and vtec control. The only thing I've gotten out of the in/out settings is that certain ones will make it so that it will rev to like 2500, then cut and drop to 1000 then rev back to 2500, etc. What its doing is just breaking up extremely badly under light throttle, and under full throttle it revs to 3k, then cuts out till it hits 2500 then it sounds like a 2 step at 2500, just bounces.

And yes I have posted on ka-t.org, I'm on there a lot. love that site!

The ECU is not seeing a MAF signal. I'v had the same problem on many cars that had bad MAF's.

[240sxDann]

It can't be a bad MAF though because it ran perfectly fine before hand, and if I reconnect the MAF wire it runs fine. Thats why I'm confused! lol

[Rockstar]

Originally Posted by 240sxDann

UPDATE! I used a small jumper on the harness to jump the two wires for the MAF, car runs perfect. I'm getting like .03 in and like .07 out, but I'm still reading 0.0 for battery volts (wtf?) and like .04 for ignition voltage? Does this have something to do with that orange wire, because my neo lights up without it hooked up? Also, when I try to do the "initialize" the buttons turn blue, and it just freezes. Is this bad? lol. I really appreciate the help guys!

I would recheck wiring.. I've had mine hooked up except for maf wiring. (don't need it just yet) But it gives me all readings battery volts,rpm,throttle %, tps reading etc.

Make sure you tapped into 2ground/2powerwires in proper order and distance.
No need to hook up orange wire, it's for dimmer hardly noticeable.I hooked it up to stock dimmer switch and then removed it after I saw the adjustment it gave. Just use the neo brightness levels..way more effective.

[240sxDann]

Yea I'm going to recheck my wiring I guess. The big thing that worries me though is that I can't get it to "initialize" and it resets every time I turn the car off, because I dont have a constant power supply. (everything turns off when the car is off)

[Rockstar]

Initialize=Resets all the settings to factory after the car is off. It's not meant to setup the neo in anyway.

Hit up apexi website I'm sure they have the manual in pdf format.

[240sxDann]

I understand that its a reset, but it wont do it. I wanted to start fresh because it keeps going to -50 on low throttle 500, 1000, and 1500 rpms for some reason. I guess thats what it was set at before?