My 1JZ Thread - trials and Tribulations

[rakkasan]

PLEASE take the time to document it Josh. I am probably not as smart as you and will need all the help I can get with the wiring. Please take as many pics as possible too. It will really help me out and everyone else that comes behind us....................lol

Although Idealsupra is making my jumper harnesses, I'm starting to understand them too. While mine will be the easiest it can be (no TEMS or ABS), it isn't as hard as you think it is. To wit:

take the cut clips that Aaron & jose sent to you, find their corrosponding clip from your old 7M harness & cut them off. With the diagrams from 1jz-gte.com, connect the leads from the 1j clip to the 7z clip. make sure that there is at least 12" of wire between them. When you have them all done, place your newly fabricated jumper harness btween the 1j engine harness & the 7m body harness, plug them in & start the car.

I will be drilling the hole through the firewall tomorrow. Aaron explained to me the ideal location, so I finally have the nuts to do it. Pictures will follow...

 

[bobiseverywhere]

I will try SH

i'll take some good pics tomorrow. I'll also try and take pics of all the things you need to look for before taking your engine out. grounds and etc.

For the wiring i am going to try and take as many pictures as i can.

Still trying to decide if i am going to extend the harness or try and run it through the Spedo cable hole.

 

[bobiseverywhere]

Although Idealsupra is making my jumper harnesses, I'm starting to understand them too. While mine will be the easiest it can be (no TEMS or ABS), it isn't as hard as you think it is. To wit:

take the cut clips that Aaron & jose sent to you, find their corrosponding clip from your old 7M harness & cut them off. With the diagrams from 1jz-gte.com, connect the leads from the 1j clip to the 7z clip. make sure that there is at least 12" of wire between them. When you have them all done, place your newly fabricated jumper harness btween the 1j engine harness & the 7m body harness, plug them in & start the car.

I will be drilling the hole through the firewall tomorrow. Aaron explained to me the ideal location, so I finally have the nuts to do it. Pictures will follow...

Thanks Rakkasan

that will be a huge help.

i am going to sell my 7M engine harness. My Plan was to use the diagram but cut the connectors from the 1J and rewire the MA71.

Your way sounds better. but i can't deny that selling the harness for some good cash will help with other things.

am I being stupid trying to remove the MA71 body harness clips and just use the 1J clips.

i don't see a problem with wiring this way. It is still the same Pricipal just changing what connecter i put on where. right?

Yes pictures and lots of them please....

I am going to be compilling all of this and making a page on my web server so people can come look and see.

Obviously i will still send people to the right places for stuff liek the wiring

 

[rakkasan]

Still trying to decide if i am going to extend the harness or try and run it through the Spedo cable hole.

Speedo cable hole FTW! Actually, I'm drilling another hole per Aarons advice. He's done one or two, so I think his advice is fairly solid. :biglaugh:

Something you might have considered, maybe not, is that when you extend the harness, you have to rewire the shield wires (knock sensors) too. I say screw that, keep the harness as stock as possible, it will last much, much longer that way...

 

[rakkasan]

Thanks Rakkasan

that will be a huge help.

N/P at all. You should think about making jumper harnesses. That way, it there is a problem, it WILL be in your jumper harness, and you can disconnect it, pull it out in the open & work on it. Otherwise, you'll be bent over backwards in the foot well trying to troubleshoot it. That is FTL...

 

[bobiseverywhere]

Speedo cable hole FTW! Actually, I'm drilling another hole per Aarons advice. He's done one or two, so I think his advice is fairly solid. :biglaugh:

Something you might have considered, maybe not, is that when you extend the harness, you have to rewire the shield wires (knock sensors) too. I say screw that, keep the harness as stock as possible, it will last much, much longer that way...

can you give me the info on this onther hole

Ya i deffinatly do not want to have to re-wire anything as much as posible.

Do you know why you need to? or how we can avoid rewiring for the Knock sensors. Arn't they part of the engine harness that plugs directly into the ECU?

 

[bobiseverywhere]

N/P at all. You should think about making jumper harnesses. That way, it there is a problem, it WILL be in your jumper harness, and you can disconnect it, pull it out in the open & work on it. Otherwise, you'll be bent over backwards in the foot well trying to troubleshoot it. That is FTL...

thats a good point. hmmm what to do.

someone please buy some of the stuff i have for sale so i don't have to sell my wiring harness...:3d_frown:

so if i understand what your doing is keeping the 1J connectore and using the Male and female then wiring into the MA71 Conector male and female.

Are you pulling the pins out and connecting your wires directly there? or are you soldering the wires to make your jumper harness.

I wish someone made a jumper harness for cheap. just buy and plug in. Then all you would have to do is extend the main harness, unless you cut this special hole your talking about.

If i can put that in with out having to extend the engine harness that would be amazing.

As i understand it. other then the plugs in the Engine bay that need t be changed

I want everything to work the way it should including the Hydro Fan Control unit and my ABS. From the diagrams on 1jz-gte.us that is what i would get right?

I wonder if Toyota sell replacment Wire harness plugs. Then you could just buy the 3 you need for under the dash and there would be no need to cut up your old harness.

 

[rakkasan]

can you give me the info on this onther hole

Ya i deffinatly do not want to have to re-wire anything as much as posible.

Do you know why you need to? or how we can avoid rewiring for the Knock sensors. Arn't they part of the engine harness that plugs directly into the ECU?

I'm (hopefully) drilling the hole tomorrow, if not Wednesday. I'll take pics & post them. The "hole" has been a mystery for too long....

If you choose to extend the harness in order to go through the stock location, the knock sensors would have to be rewired because of the added length. If you make the new hole, the stock KS wires would be fine...

One thing has bothered me about making a new hole, that's what to do with the stock hole. I'm going to see if I can close it up with expandable foam, & then use a jack saw to cut it flush with the fire wall. Anybody else have a better idea?

 

[bobiseverywhere]

Well the Engine is out of the clip. Won't do that again without a leveler

Just need to get the tranny off. Never done that before. anyone have some tips???

 

[mk3forme]

I cant wait to see some pics as im kinda lost here. If you run the JZ wire through another hole and im assuming this in on the drivers side of the firewall, where does the ECU end up? Not in the factory location right? Sorry but I wasnt aware of another way other than extending the harness and running it through the factory hole. My harness has already been expanded and it makes me nervous as hell to use it since I didnt do it and it looks like spaghetti. I have no idea if the car will even run with this thing. Dont know if you can see it in these pics.

 

[Brewster]

Will you take a pic of the rear speed sensor on the tranny? I'm trying to figure out my ABS and I don't think I have the rear speed sensor since my engine set came out of a non-ABS front clip. I'm not exactly sure where it's located on the transmission since I don't have one...

 

[suprastanger507mgte]

if you look at the tranny, its near the tailshaft, there is a small cap in the
r-154 if that is what you are using. U will need to remove that cap and bolt the rear speed sensor on.

This will be located on the left hand side if you are looking from the back end of the tranny.

THe automatic tranny sensor will work.

 

[Brewster]

if you look at the tranny, its near the tailshaft, there is a small cap in the
r-154 if that is what you are using. U will need to remove that cap and bolt the rear speed sensor on.

This will be located on the left hand side if you are looking from the back end of the tranny.

THe automatic tranny sensor will work.

that's where i thought it was but i wasn't sure if i was looking at the right thing or not.:icon_conf

 

[bobiseverywhere]

I see what you mean about your wiring. I'm sorry to say but i'd be worried too. I am not an expert or anything but it does look kind of scarry. Looks like they cut the harness wires all in the same spot.

Well hopfully we will see this "Wonder Hole" soon :biglaugh:

i know i am not going to attemp extending the harness now knowing this.

I cant wait to see some pics as im kinda lost here. If you run the JZ wire through another hole and im assuming this in on the drivers side of the firewall, where does the ECU end up? Not in the factory location right? Sorry but I wasnt aware of another way other than extending the harness and running it through the factory hole. My harness has already been expanded and it makes me nervous as hell to use it since I didnt do it and it looks like spaghetti. I have no idea if the car will even run with this thing. Dont know if you can see it in these pics.

 

[suprahero]

Even with all the above help and support, I'm still scared. You're always scared of the unknown and until my clip arrives, it's unknown...................:aigo:

 

[Brewster]

Even with all the above help and support, I'm still scared. You're always scared of the unknown and until my clip arrives, it's unknown...................:aigo:

It was easy. If you have any experience pulling the 7m you shouldn't have any problems. I didn't make my wiring harness, but after installing the extended harness 935 made me, I could've done that myself. I was just weary, like you, had never seen the harness before and didn't want to risk screwing shit up. It was fun.

 

[suprahero]

Fun to me is beating a few millionaires at Texas Holdem. Wiring a 1jz is going to be far from fun, but I may be surprised once I start working on it. Again, I appreciate the positive words and support. Josh and Rakkasan and others have been very gracious with their comments and pictures. Thanks, Jay

 

[bobiseverywhere]

i am worried about doing the wiring as well. I have never done any Wiring before or soldering. On the Same note i don't have the cash to pay someone $600 for a Harness.

I am just hoping i don't screw anything up either.

 

[bobiseverywhere]

N/P at all. You should think about making jumper harnesses. That way, it there is a problem, it WILL be in your jumper harness, and you can disconnect it, pull it out in the open & work on it. Otherwise, you'll be bent over backwards in the foot well trying to troubleshoot it. That is FTL...

I had another idea that does not involve soldring at all. as long as the conecters are in the right place. You can just pull each pin out and then pin it into the 1JZ harness no Soldering and so screw up's. Unless you put something in the wrong place :3d_frown: which i hope i do not do.

it might be tedeous but i think that would be the cleanest/safest way to go for me. that way i can't screw up any solder where it really counts

 

[suprastanger507mgte]

What year cars are you guys putting the 1jz in? IF you guys get stuck, we can always look at our setup and tell you exactly where what goes...I know I will