Sam94 Posted June 9, 2020 Share Posted June 9, 2020 Hi everyone, I believe I'm posting this in correct area. So I currently have a 1jzgte vvti from a jzs171 in my mk4 supra, the engine side looks to be all wired up, I cant find any diagrams in order to wire up the body plugs from supra to the 1j loom. I have found some diagrams but the colours of the wires dont match etc. Would anyone be able to shine some light on it please? Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted June 9, 2020 Share Posted June 9, 2020 You are going to need to get creative, its been a few years since I've put a 1JZ VVTI in a MKIV supra so I can't remember all the details. The chaser/crown engine loom is very different to the Supra. First the ECU is located in the engine bay, rather than in the engine footwell. So you will need to extend your loom to reach the footwell. Second, the chaser/crown 1JZ ECU has two ecu plugs that terminate on the engine loom side, and the other two ecu plugs terminate on the interior loom of a chaser. This is a problem as the Supra ECU has 3 ECU plugs that all terminate on the engine loom, and the interior plugs it uses are separate to the main ECU plugs. Unless you happen to have an interior loom from a chaser/crown, you will also be missing the two ecu connectors that you require. So first mission is to buy those two connectors, I think wiring specialities in USA stock them iirc. Once you have the two missing plugs, you can then get creative and wire in those connectors to the various interior functions on the MKIV Supra side. Also the fusebox wiring is completely different, so that will need some work to get working with supra fusebox location and connectors. Here you can clearly see the OEM 1JZ engine loom side versus the newly wired white/red wires that go to various places. I've lost all my resources regarding what wire does what, so can't help you there. But pinouts do exist somewhere out there on the internet, so best get searching. Also make sure you are aware that there are difference in looms between 1JZ VVTI for a Soarer, Chaser/Crown & some other variant, they use different plugs on ECU's. The above is a ballache, so if you are looking for an easier time I would suggest finding a 1JZ VVTI loom from a soarer, as this loom is almost plug and play for a MKIV Supra. Or buy a standalone and make a custom wiring harness. Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted June 9, 2020 Share Posted June 9, 2020 Hold the phone, I lied. I do actually have some documentation that I wrote when I did the swap years ago. https://drive.google.com/file/d/14XHlSFB5uvwRSFWSZzzY_4-vM-HcIQfF/view?usp=sharing God knows what I was smoking when I wrote it all, but hopefully you can make some sense of it. Info is spread out over various tabs. The loom I was working with was from a chaser, so hopefully that matches what you have. Quote Link to comment Share on other sites More sharing options...
Scooter Posted June 9, 2020 Share Posted June 9, 2020 Just in case its not in Mike's link http://www.mkivsupra.net/vbb/showthread.php?232824-J-Spec-Engine-Harness-Connector-Details&highlight=harness Quote Link to comment Share on other sites More sharing options...
Sam94 Posted June 10, 2020 Author Share Posted June 10, 2020 (edited) So with the 1j I got the full loom, and ecu, engine side is all plugged in it seems like and have the 2 white plugs for the body side. Hope these pics send Edited June 10, 2020 by Sam94 (see edit history) Quote Link to comment Share on other sites More sharing options...
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