Hey guys

Info:
00 max 5spd
SAFC
6cyl up arrow
Hot wire 1in 1out

Just installed the safc WITHOUT attaching the blue (oxygen sensor ) wire. Everything else is setup using SR20DEN's writeup.

Now, I had one installed before, but this time Air flow only reads .8% on a WOT 1st gear run.....it used to be around 50%. What can be causing this? So far no SES light and yes I CUT the maf wire. Yellow to ecu white to harness.

Also, my throttle % won't go past 77.7%.

Tach works fine.

I used the same wires as before, so I really don't know what can be causing this.

Thanks,

DF

 

Did you recalibrate the throddle input on the SAFC? That could have some thing to do with it.

 

try initializing and make sure its setup BEFORE the car is started?

 

Read the manual on the SAFC2, before you start the car you are suppose to depress the accelerator to the floor for 10 seconds then release for 5 seconds.

Also for the MAF wire, you cut your MAF wire, put a male connector on it, plug it into the yellow(input wire) on the safc harness then install a female connecotr on the other end of the MAF wire and plug it into the WHITE wire on the safc2 harness. You did that correct?

the oxygen sensor wire is pretty useless anyways especially with a narrowband o2.

Ive had mine instaled for awhile and my CEL has yet to come on, and i have the JWT ECU which is suppose to throw a po136 lol..

 

I don't have a completely full safc harness, but I cut the ECU harness wire put Yellow to the ECU and White to the harness end.

Yeah, I took her out for a ride. The car rides just like normal, but its still only reading like .8% airflow. That's only based on the maf as far as I'm concerned.....so the only things I could have wrong are the 2 wires or something setup wrong.

DF

 

First of all, go over your wiring again. Make sure there aren’t any wires touching, and all connections are good and strong.

Also, you state it’s reading 0.8% Afl? Under what circumstances. I know you said @ WOT, but does it climb as RPM's rise, what does it read @ idle? Is your MAF ok?

What does the raw data stream look like?

Explain in detail what you mean by you don’t have a complete harness. Seems like the lines of communication need to be opened up a little bit here.

 

I have, but I will definetly do again.

Its 0.0 until like 1500rpm and slowly climbs by .1 increments up to .8 somewhere before redline. Maf is brand new and like I said the car drives perfectly normal.

WTF is that?
The harness for the SAFC ends roughly 3 ft. after the harness clip in the middle of it. The ends are cut off and stripped.....and yes I redid the ends

Wires are not soldered because the solder I've tried to use will not stick to the safc wires.....I assume because they're SS!

DF

 

It's obvious something is up with your MAF or MAF wiring. When going through the settings, in the etceteras mode, there is a way you can look at the raw data values (voltages). This way, it will tell you what voltages your SAFCII seeing. Test your MAF with a volt meter and see what voltages it gives you. Compare them with respect to the raw SAFC MAF readings. This will show you if there is a discrepancy between them, and if there is, it will narrow down where the problem is.

 

I'll definetly test that tomorrow.

But I need to sleep.

Thanks a ton for your fast responses!

DF

 

MAF = 3.42V somewhere around wot 5056rpm
SAFC = .7ish% airflow and like .01V from Sensor Input 2

....so doesn't this mean my ECU is also seeing this wicked low voltage....and my car still runs fine at idle and everything.

I'll definetly investigate this in a while. I have too many exams right now though.

DF

 

if your computer is seeing that super low voltage you would be running super lean with a lot of timing most likely. you would notice a difference. can you check the resistance across your wire connections or maybe even probe the wire off the ecu pin to check the voltage there?

 

can someone please confirm that for A33a, the MAF in/out #s are indeed 01/01.

Because if the wiring is right, and all the signs point to a MAF issue, a wrongfully selected IN/OUT will simulate that situation

 

I had that setting before and it worked fine. I understand how this could be messing it up, but the SAFC is not reading the full voltage for the maf. Give me until Friday and I'll make absolutely sure nothing is not connected properly.

DF

 

I know how to check voltage, but not resistance fully.

Do I simply select the proper scale for resistance and blk-->grnd red-->part of the wire?

Or

Put on both sides of the connection?

DF

 

+1^^^^^^^^

 

bump!

 

17/17 ................

I've used 17/17, 1/1 without any difference. I am A33B though.

 

you can use any input/output as long as the numbers are the same it makes no automatic corrections (for a VAFC that is)

 

I'll be back with resistance results once I'm done with this exam in like 2 hours.

Can you guys post where I should take the readings from?

DF

 

Ok so I did the resistance testing with the car off....like I think I'm supposed to.

Resistance from white to yellow (safc in between) = .01 ohms to .05 ohms.
Resistance from yellow to ecu = .00 to .05 ohms.

This leads me to believe I do have it hooked up right....I think.

SAFC still reads under Sensor Check that In-1 and In-2 (I don't know which one is the maf) are well under .1V WTF's up with that?

Should I check resistance from the MAF sensor (the pin for the signal wire on the maf harness plug) to the beginning of the white wire? And then to the ECU?

Also, I was tinkering around with the SAFC and put for hotwire in=00 and out=00. It still reads 0.0% at idle, but holding 3000rpm it reads around 12-13%, which is much better than .8%.

Any suggestions are welcome!

DF

 

With 0 in 0 out selected max air flow = 16.4%

 

bump anyone?

 

Redo the MAF/ECU wiring.

 

when you checked the MAF voltage, was it at the MAF or the ECU side of the wiring? i would probe the wire at the ECU and check the voltage there to make sure its the same as at the MAF. those ohm readings seem fine, so it seems your connections are good.

 

That reading was from the MAF. I will definetly check out the voltage at the ecu. I'm suspecting the signal wire for the maf is broken somewhere in it.

DF

 

Problem solved! Turns out the signal wire was broken (slightly I guess?) right off the of the maf connector. Didn't notice this until I did resistance from the harness to the other side of the break!

Thanks for all your help,

DF

 

Hey guys,

Figured I didn't need to start another thread....

Anyways, the SAFC is working fully now, but I managed to get my hands on a manual. It says for Cefiro's (vq30de) to use HW-4. Does this mean 4in 4out? I have a 00 max, but I assume it would be the same.

Right now its on 1in 1out and works, but maybe it could be more accurate?

Thanks,

DF

 

it doesnt matter if you are matching it up. if you have the same value for in and out the afc doesnt make any corrections besides the ones you dictate through your high and low throttle corrections.

 

But

 

simple enough

 

This is what I discovered........

http://forums.maxima.org/showpost.ph...1&postcount=16

 

That's using the Z32 MAF though. I'm using a Q45ish MAF so, IN1/17OUT for me. We're on the same page.

 

At idle I get like 2-3AFL on my untuned SAFC. Everything runs fine . I assume I hooked mine up correctly.

 

I get 1.8/1.9%

 

Yeah at idle im at 1.8-1.9% what do you guys normally reach at lets say 7000ish rpm..i think the highest ive hit it 62.8% airflow.

 

I used to be in the 72.x%, but now, with my LRMAF, I'm lucky to see 52+%.

 

My max reading (stock rev limit) is around 53%.

DF