Changed MAF, CAS and PTU still getting code 12 wont start!

[Blurr]

Hey guys,

So I got my new MAF sensor in the mail today, and hooked it up. ECU is still giving code 12. CAS and PTU are changed and are new. Im still getting this code.

Any ideas on why the car would be giving the code?

Do I need to have the air filter on the end of the MAF for it to be giving the correct air mixture?

[BigTDogg (MA)]

Do you have an SAFC hooked up?

Also, how does your MAF connector look? Any corrosion? Broken terminals?

Code 12: Mass Air-Flow Sensor circuit (MAS)

Problem: The MAS sensor circuit is open or shorted (abnormally high or low voltage is registered).

Check: Harness and connector (if harness and connector are OK, MAS might be bad)

I'm sure you knew the above, just posting it for reference

[Blurr]

Ya thats why i got a new MAF, MAS...

MAF connector looks great, no corrosion, and none on the new one I just bought.

Yes I do have a SAFC II hooked up. I tried initializing it and still nothing. Is there something more I need to do after initializing it? Possible reason it wont start?

[Z32TT]

Do I need to have the air filter on the end of the MAF for it to be giving the correct air mixture?

Why dont you try putting the filter on when starting it and see if it drops the code, it could be sucking in to much air without it throwing the MAF off possibly giving you a code. Although im not too sure that could be the problem since i never left the filter off while starting it on an MAF setup. Also try reseting the ecu too if you haven't already.

[Blurr]

i took off the jwt one and stripped the boltcaps off. Waiting on a new one to arrive.

Reset the ecu? I disconnected the negative batt, and pulled the bolt connecting the ecu and reseated it. Is there another way to reset it?

I also cleaned the engine grounds but it still wont fire

[BigTDogg (MA)]

i took off the jwt one and stripped the boltcaps off. Waiting on a new one to arrive.

Reset the ecu? I disconnected the negative batt, and pulled the bolt connecting the ecu and reseated it. Is there another way to reset it?

I also cleaned the engine grounds but it still wont fire

Is the SAFC a new install?

If so, my money is on the SAFC. If not, I think my money is still on the SAFC.

I know it sounds painful, but here's what I would do. Cut all the connections to SAFC, connect the (IIRC) yellow MAF wire back together like the SAFC was never there. Then try starting. If it starts, your SAFC is bunk.

Here's why I say this. After I reinstalled my engine, I tried to fire it up. Started right up, first try, ran for 10 seonds, then died. Could not get it to restart. Slept on it. Then in a dream it came to me, connect the ECU directly to the EFI harness. I had my SAFC soldered into a Boomslang extension harness. Turns out the SAFC I had purchased was bad. I was super pissed at the eBay seller, but glad my car had started.

Since the SAFC directly manipulates the MAF voltage to the ECU, I suspect that is your culprit. Before disconnecting it, double check all the settings specific to the VG30DETT engine. They should be in the owners manual, if not I can dig the PDF up from my archives somewhere.

[Blurr]

BigTDogg if you can that would be awesome. Also im not sure what connectors are what, the yellow one is by the ECU? I dont think I ever got the SAFC II properly configured after initialization.

[evildky]

I've never cared for dafc ro any piggy back system for that matter, with the availabulity of code hacks dfor these cars there si no reason to run a piggyback

[BigTDogg (MA)]

BigTDogg if you can that would be awesome. Also im not sure what connectors are what, the yellow one is by the ECU? I dont think I ever got the SAFC II properly configured after initialization.

This link should work Email me before tomorrow if you need me to send it to you. That's the owners manual and the pin out/installation diagram.

Here's a color coded ECU pinout.



Good luck, hope it helps!

[Blurr]

I posted this on another forum.

FML IT WAS THE SAFC II!!!!!

You guys aint gonna believe this.

So went outside and decided to cry a little bit in my car.

I looked at the SAFC II, and deceided to change the Hot-Wire settings under sensors to 02 and another one that says Add.

I tried the car, and it turned right over. Drove it around the block and up and down the street with no issues.

FML

IT WAS THE SAFC II!!!!!! UGH!

So, now im curious. If the MAF was actually bad or not. O well at least it has a new CAS, PTU and MAF. Its idling right now at 1000, and purrs like a kitten!

Thanks everyone for help again for my noobishness!

Im going to study up on correctly setting this SAFC II. It backfires every now and then, but not so bad as it was before.

Anyone have any optimal settings on the SAFC II or how I should set this up? Just wanna make sure Im not missing anything else. I dont know what im doing with the SAFC II, just got lucky I think changing the sensor count.

[BigTDogg (MA)]

So, now im curious. If the MAF was actually bad or not. O well at least it has a new CAS, PTU and MAF. Its idling right now at 1000, and purrs like a kitten!

Who cares, now you get to go dual MAF with teh Selin FTW!!!

Glad it worked out for you :-)

[evildky]

now you can look at that high idle

[NolimitZ32]

wait you set 02 and add running a single MAF? WTF? thats not right but if it works maybe that was my problem with the SAFCII

By the Manual Z32 MAF settings: Sensor No. in:02 out:02, sensor cal. in:01 out:01

[Blurr]

Ill put my SAFC II Settings for everyone here later. Right now Im troubleshooting removing the speed sensor, and realized the exhaust is in my way...

FML

[BigTDogg (MA)]

Ill put my SAFC II Settings for everyone here later. Right now Im troubleshooting removing the speed sensor, and realized the exhaust is in my way...

FML

LOL, once you remove the passenger side testpipe/cat, the speed sensor is rather easy to remove. Patience, it's all worth it once it's up and running

[300zxcanyondrifter]

What is SAFC????

[BigTDogg (MA)]

Super Air Flow Converter, it's a tuning "tool"