92 ls400 wiring help needed

[uknuta]

Hi i'm new on here and just needed a bit of help with wiring a 1uzfe out of a 92 ls400. I have the whole car and have been going through the loom cutting out what i don't need but i'm a bit stuck with the 28 pin connector into ecu and 16 pin grey connector that plugs into ecu harness.
The 28 pin i have right (i think) i have 5 wires into it, 1 blk/yel wire which is permenant 12v, then 2 blk/red wires and 2 blk/org 1 smaller than the other. Not too sure which pins are what though.
then my 16pin connector i have a large black for starter power and a blk/wht for starter solenoid, then i have a large blk/org, a blk/red and a blk. These all need to be connected for it to run.
the eng and ecu are still in the car so i wanted to get it all running with loom figured out before swapping into another car. The other issue i have is the theft computer. If i unplug it, it won't start the car. Will this be an issue once i take external power supplys for batt, ign and starter relays?
Any help appriciated.

 

[uknuta]

Here are pics of where i'm at

 

[gloverman]

What is the ECU number?

 

[George_R]

the computer you have there is a security *warning* ecu, it's for rhd asian market 1989-1994 LEXUS LS400 (UCF10R-AEPGK) (engine computer p/n 89661-50070, -50110, -50180,-50210)

A security warning ecu does not do anything related to engine start/stop.

 

[uknuta]

Thank you for the replys. The ecu no is 89661-50180.

 

[uknuta]

Your dead right with parts numbers and model but when i unplug that theft warning unit the starter won't crank.
What is that theft warning unit for?

 

[gloverman]

Just throw the warning ecu away and wire the power supplies separately. You have also removed the under dash diagnostic wiring which is helpful if you have issues later.

 

[uknuta]

So the wire up the 5 wires on the 28pin plug through a relay each? Then what about the 16pin plug? I think the blk one is an earth. Thanks for your help

 

[sideshow]

don't be so lazy and pull the wires out of the ecu plug rather than cut them very short
just makes it not look so bloody dodgey
would have taken 2 minutes
people should the more care even if they are not getting paid for the job and even if its their car
my 7 year old even knows to take them out hehe

 

[uknuta]

Plugs will get de pinned when going into new car. Was just seeing what is needed so its nothing to do with lazyness.

 

[Mat Grant]

Hi guys - what is the method for removing pins from ECU plugs? I left mine long enough to resplice in case I had a wiring problem and had to reconnect something. Now it is running fine and I don't need to do this I can remove he other wires from the ECU plugs.

Thanks, Mat.

 

[gloverman]

If it is a 40/40/40 remove the yellow cover to expose the lock tabs. Pop the tabs back and pull the wires out. Others are similar. 20 series they have a lock on the side.

 

[melvinmelvin]

If it is a 40/40/40 remove the yellow cover to expose the lock tabs. Pop the tabs back and pull the wires out. Others are similar. 20 series they have a lock on the side.

as a follow up question;

is it adviceable to remove all wires/plugs not in use?

 

[Zuffen]

Yes, it removes the risk of a short on one of those exposed wires to either another or just sorting to earth.

They are easy to de-pin.

 

[Mat Grant]

Hi, thanks for the info, I will do this. Yes mine is a 40/40/40 from a 92 Soarer. I was planning to put heat shrink over the end of each unused wire but now I know they can be removed I'll take them out.

Mat.

 

[Mat Grant]

Btw - follow up question, on my ECU plugs, the unused pins (from the factory) have a yellow rubber or plastic dust boot, is it possible to obtain these?

Thanks, Mat.