lol okay, so we're trying to finish the Z swap this weekend, but we have a big problem. The wiring harness we have is incomplete and chopped, and we're trying to mate it with the Maxima's harness on the VG but we don't have a FSM. If anyone who has a FSM and would be willing to help Mark and I out would e-mail me, that would be really cool. Thanks in advance...

 

WHAT?! you're doing a swap w/o a FSM?
brave..very brave.

 

Not really, it's pretty cut and dry... except for the fact that the wiring harness we have is missing all of the emissions stuff... and looks to be missing the lead for fuel temp... and some other stuff... and the ecu is for an 85 and we are using an 84 engine... lol !!!!

if we could get a copy of the wiring diagram for the VG wiring harness i could make a new wiring harness, though. This is all we have left to do, other than source the fittings for the turbo oil and coolant lines (it's an upgraded turbo, not stock) so we're really close to being done!!

 

if you are using the Z31 engine harness and the Z31 ECU....then shouldn't you just have to chop the wiring in half and just resolder all the connections "at the firewall", why do you need the Maxima wiring?? maybe I'm missing something.

 

I'm worried about the fpr silinoid control module or whatever the hell it is. Basically, I'm worried about fuel delivery. It has a different fpr... and we're using the stock fuel pump for now (it is new but will be replaced soon with an upgrade). We toyed with using the Maxima ECU, and having it reprogrammed, but in the end it was going to be pretty expensive. We thought about JWT, but that's even more expensive and we're ballin on a budget...

So I thought about using the stock ecu for the Z... but it's all chopped up and I want the fuel temp and tach and maybe even speedo, ya know? If I had the FSM it would help but I don't and I don't think Chilton's has the wiring diagram for the ecu, does it? I have the wiring diagram for the Z ecu available, just not for the maxima...

 

I'm worried about the fpr silinoid control module or whatever the hell it is. Basically, I'm worried about fuel delivery. It has a different fpr... and we're using the stock fuel pump for now (it is new but will be replaced soon with an upgrade). We toyed with using the Maxima ECU, and having it reprogrammed, but in the end it was going to be pretty expensive. We thought about JWT, but that's even more expensive and we're ballin on a budget...

So I thought about using the stock ecu for the Z... but it's all chopped up and I want the fuel temp and tach and maybe even speedo, ya know? If I had the FSM it would help but I don't and I don't think Chilton's has the wiring diagram for the ecu, does it? I have the wiring diagram for the Z ecu available, just not for the maxima...

 

Your boy Jahlil ph'd me and offered his help, but i haven't heard back from him yet. he used the JWT, though, and I'm trying to get around that...

 

sorry, can't really help you with that...no experience doing all that re-wiring. are there wires missing from the Z harness or something??

 

yeah, all of the emissions stuff and who knows what else... but jahlil is helping us out so I think from what he's telling us there isn't going to be any safe way around using the JWT...

 

so why not just buy another complete Z harness than?? the re-wire is possible and should work, but it will be VERY time consuming!

 

Because of the fuel pressure regulator i believe. it looks like it's going to have to be jwt for a new reprogrammed ecu...

 

Because of the fuel pressure regulator i believe. it looks like it's going to have to be jwt for a new reprogrammed ecu... and it's not an american engine. jspec engine

 

use the Maxima fuel rail injectors and regulator...

EDIT: but anyways how does the FPR stop you from using a new harness??

 

I'm wondering, if you are doing a motorswap why not just use shortblock from the Z? IMHO I wouldn't want to convert back to a Z31 wire harness. Wouldn't it be easier to just swap over the intake manifolds and sensors from your old engine to the new one? This would allow an easier (from a wiring standpoint) swap. However if the Z harness isn't complete you can use a harness from a 2nd gen maxima. The only difference is you have to add a wire to the detonation sensor to the ECU. Also to do the swap without a FSM . Good luck.

 

Well, thanks... but I don't believe in luck (if I did I wouldn't have anything but bad luck anyway lol) We're about done, though... we're going to need a new ECU however but when Mark sells his other engine that won't be a problem. Getting it finished this weekend, however, proved to be impossible.

 

here's how you keep from blowing up that engine:

Step #1. buy an FSM. do the wiring correctly, instead of trying to rely on people thousands of miles away.

Step #2. Buy the correct ECU so you don't screw things up and blow the heads off the engine.


don't say we didn't warn you.

 

Step #1: don't really need it at this point, the only thing left to deal with was the ECU and that's covered now

Step #2: got that covered, too, as I just said in my last post. Have to go with JWT...

Again, thanks though. Oh, and 'told you so' was never my style... I just wanted a wiring diagram, not the whole freakin FSM. Don't need it now, though... but thanks!

 

I have a 90 maxima service manual with the wiring diagram for just about everything for the vg motor. If this would be of assistance to you, just reply to me in this post. I can easly fax it to you or find a friend with a scaner and send u the info(if its what your looking for).

 

That would be really great!! i can e-mail you my fax number...

 

Just to let you know.....The wire schematic is quite a few pages long and it can get confusing. I will get all the information together tonight for you and I'll fax it to you when I get to work (thats where the fax machine is) tomorrow.

 

Thanks very much!

 

My chilton has the entire wiring diagram.

 

Mark's Chiltons doesn't...

 

Weird..I just looked at it this morning (see my post on whack brake lights). I am 99% sure it was all there. It shows chasis wiring and eecs wiring. Chapter 6.

 

Weird..I just looked at it this morning (see my post on whack brake lights). I am 99% sure it was all there. It shows chasis wiring and eeccs wiring. Chapter 6.

 

No problem.....Check your fax machine. I just sent the complete wiring diagram for the E.C.C.S. This is from the Nissan Maxima Manual Service manual that the mechanics use NOT Chiltons or Haynes. Enjoy.

 

Very cool. Thanks. It shows the ECU, which is exactly what I needed. Thanks again, Carmelo!