This is an exploded view of the JZA70 EFI system previously translated by someone. The resolution is not great, but you can trace the ECU pins and wiring to their final destination. This can be useful for custom harnesses. This is from the JZA70 toyota manual. The 3 pages are listed as images and at the bottom you will find a link to a printable PDF. If you print them out and put the 3 together you will get the full exploded view. The reason why there are 3 pages is because in the original manual it was a fold out single page.

On each wire if you look closely, you can see the wire colors. For example B-O is black/orange, B-R is black/red, and so on. If you see L, that means blue.

Here is the PDF printable version: