z32 maf wiring into harness.**picture**

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240tuned91
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z32 maf wiring into harness.**picture**

Post by 240tuned91 »

ok now i beleieve my cars ecu is not getting a signal from the maf. why? because turning some tuning i had my injectors pretty much turned off and i was still pegged rich on my wideband. so i split the lume apart from my maf. and noticed the 0-5v signal wire or b on the jim wolf z32 maf wiring diagram and the ground.(electrical not chassis ground go into this white lume. it was holding them. when i cut it open it had a metal wiring wrapping around them. idk if thats justs holding them together or what it is. either way here is a picture. also im trying to figure out how i can test the signal wire from the back of the ecu. anyone kno how to please let me know. well here is the picture.
[img][img]http://i233.photobucket.com/albums/ee13 ... 091637.jpg[/img]

im gonna grab more pics but it got dark.[/img]
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Post by ghostchild316 »

I only used 3 wires that went to the ecu. Car ran great so I just snipped the "extra ground" that some say to ground to chassis.

On the plug I used the wires even matched up to the stock harness
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Post by 240tuned91 »

yeah but the signal and the one ground ran in a tight loom all by them selves. with that wire wrapped aorund them. i wanted to kno whats that for.i printed out the jw diagram so im gonna double check tonight
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Post by irritatedmax »

i had the exact same issue with my s14 ka-t wiring. it is running rich because you have the low voltage (0-5v signal) wire and 12v wires reversed. i used the jwt instructions and read them wrong repeatedly. my brother looked at it for two seconds and said you are reading the diagram wrong.

the instructions say "viewed from harness side of the plug". it has been a few months, but i believe that means looking that the back side of the plug as if you were going to plug it in. i think i was originally doing the opposite and was looking at the pronged end of the plug and wiring according to that. you'll notice that only the voltage wires switch position when you hook it up in either manner.

my maf was reading like 3v at idle (shown on my nisturne) when it was wired wrong. after correcting it, it dropped to like .5v.

i am 100% that is the issue. just switch the 12v wire to the current 0-5v position and vice versa.

as for the grounds, i tried grounding them together and to the chassis and it works the same either way. the extra wiring wrap stuff you asked about it just sheilding. you don't need it. just cut it away so you can get access to the wires.
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Post by 8-bit »

exactly... i ddi the same thing too.. the JWT diagram is a visual trickjob phenomenon for sure.
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Post by SRKILLA35 »

8-bit wrote:exactly... i ddi the same thing too.. the JWT diagram is a visual trickjob phenomenon for sure.
where can i find that diagram?
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Post by SRKILLA35 »

8-bit wrote:exactly... i ddi the same thing too.. the JWT diagram is a visual trickjob phenomenon for sure.
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Post by 8-bit »

the internet

try google.com
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Post by irritatedmax »

http://www.jimwolftechnology.com/tech_details.asp

its a good ways down the page in the electrical and wiring section.
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Post by 240tuned91 »

lol so it is from lookint at the back? thats dumb lol the picture looks like u looking into the connecter so its a diagram of the back side so yeah. im pretty sure i wired it reversed,
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Post by LigouriRd. »

That is industry standard for wiring harnesses, it is meant to be understood by the person assembling the harness...pushing the contacts into the connector housing. It took me a while to get used to the concept as well, now it is second nature.
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Post by 240tuned91 »

so kno i believe it was actually wired up right and im gonna stay pegged at 10.0 rich still...
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Post by 240tuned91 »

however what is that cord around those two wires? no one has a comment on that
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Post by seanc »

that is a shielded wire it keeps interference away from the wire. what year is your car i will tell you how to ohm out your maf harness to the ecu.
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Post by 240tuned91 »

95 sir but if that ecu signal wire is cut in anyway could it be groudned by that wire?
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Post by SRKILLA35 »

irritatedmax wrote:http://www.jimwolftechnology.com/tech_details.asp

its a good ways down the page in the electrical and wiring section.
Thank you
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Post by LigouriRd. »

240tuned91 wrote:95 sir but if that ecu signal wire is cut in anyway could it be groudned by that wire?
Well, to check if it is a shielding wire, see if you can get a electrical meter. Check the continuity or resistance between that wire and the chassis. If it has very little resistance then you can use it for the chassis ground that is needed for the maf.

You should be able to tell if it is working correctly by seeing if you can rev throughout the full range, a bad maf or janky wiring will stop at 3k.

As for the reason why you are rich, well it has been my experience that you cannot just plug in a z32 maf without adjusting whatever is tuning your ecu. Afc, for example, will need different in/out settings and have to adjust the correction. It might help to know what you are using.
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z32 mafs ground to chassis

Post by jmac636 »

I just upgraded my setup to a z32 maf 550cc sards and Efi specialist tuned ecu and When I wired my maf like the jwt diagram and it ran rich. Well I swapped my voltage wires and still ran the same. I was about to swap my other setup back in when I got this great idea to add a ground wire straight from the maf to the chassis. Well the richness went away.The only problem I have with this tune is without the a/c on the Iacv seems to not work. The idle will flucuate up and down. Then when I turn the a/c on it runs normal and my afrs steady at 15.3 or so. Also it's a little sluggish between shifts compared to the jwt tuned ecu.

So try to add a wire to the grounds coming out of the plug and attach it to your chassis. Let me know if this helps.Good luck bro.
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Post by 240tuned91 »

thanks for all the info however i have one grounded to the harness ground and the other going to the chassis. i guess ill make another one
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Post by s-14 »

So whatever happened to this, did you ever get the mafs to work right?


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