Wiring an AE101 4AGZE into a 1988 NA MR2

Seagondollar · 2025-10-15T17:38:43-0400

I have a 1988 MR2 that has been sitting far too long with the AE101 4AGZE engine installed in it (standard transmission). Now that I am retired, with a new shop where we moved, I need to get on to wiring it.

I found a couple of questions from back in 2005 asking for the wiring information, but the links provided are now dead.

I have wiring diagrams for an AE92 4AGZE, a list describing what I had discovered years ago of the list of wires that I spotted on the engine, and, of course, the wiring information from the car.

I took a lot of pictures of the engine on the stand, a lot of which have me finger-pointing at stuff I'm not clear of what it is.

I also vaguely remember somebody in this forum, or DIYAutoTune, offering a wiring loom from that car to the engine.

I'm a retired Electrical Engineer, so I should be able to generally figure out interconnects, IF the goesinto description is similar, or matches the goesouta description.

Any information to help me in this wiring discovery will be greatly appreciated, and I will be glad to share any tidbits I find out along the way.

rmeller · 2025-10-15T19:01:24-0400

An engine harness from an AW11 SC might make it simpler. There aren't very many wires that are specific to the SC. What SC ECU do you have?

Seagondollar · 2025-10-15T19:43:01-0400

I thought it was an AE92 and that I had a picture. Can't find the picture, and hopefully I can find the ECU. We moved here a year ago, and I moved all the stuff out in my new shop. It's bound to be there.

Oh, and all the pinout diagrams I have a for the AE92. (That may be a clue)

rmeller · 2025-10-15T19:47:19-0400

It would be worthwhile to confirm that the AE92 ECU is the same as the AW11 ECU, or at least has the same connections. I have no idea, but it seems common for different models to have essentially pointless wiring differences.

Seagondollar · 2025-10-15T20:32:07-0400

These are the connections on the AE92. I don't know if the AW11 ECU has an S/C controller.

rmeller · 2025-10-16T11:53:57-0400

The AW11 SC car has a different ECU altogether. Among other things, it ignores the AFM at high engine load and computes the fuel from the forced volume of the SC.

Wiring an AE101 4AGZE into a 1988 NA MR2

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