Pinout charts and wiring guides that help you connect a 2ZZ ECU to your factory harness.
In early 2021, I wanted to swap the engine in my car, a Chevy Prizm (rebadged 8th generation corolla) A less common but highly desired swap at the time was to swap in the Toyota 2ZZ engine with its corresponding 6 speed manual transmission. This engine and transmission combo was better than the stock 1ZZ engine and 4 speed automatic transmission that was in my car in nearly every way. It revved higher, made more power, and had a bigger cam profile. It would be way more fun to drive!
I bought the engine and transmission and began work on the swap. Everything went smoothly until I went to do the wiring! There was very little information on how to do the wiring for this swap, and even less so because I was the first person to do this swap into a Prizm chassis. This presented different issues due to some of the electronic components, mainly the Air Conditioner system being of GM design.
I looked everywhere for a solution and was only able to find one person offering an adequate solution, an adapter that would let me use my existing harness with the 2ZZ engine and ECM. There was only one issue, he wanted $600! I had only spent that much on the swap at that point; I was not about to double the cost of my entire swap for a hunk of plastic and metal. Because of this, I spent time learning how to build one myself. I spent $15 on a two day subscription to all of Toyota's wiring diagrams and built these spreadsheets with all the info you need to swap a 2ZZ engine into almost any ZZ chassis. Even better, I did it for under $20 of materials, and the diagrams I made are completely free for you to use!