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I've been reading on how to wire up my 3.4 when I get it into my 94 4runner but it looks like my ECU plugs are different then most. The body plug looks like all the rest. From what I understood, I'd have to merge 1 plug off the ECU on the 3.4 with 1 plug off the 3.0 ECU. But it looks like my ECU has 5 plug locations, 2 of which are on the engine harness and 2 that I cut from the dash harness. One appears to have been missing from the start.
Have i just been looking at the wrong wiring diagrams?
The center plug is for the engine immobilizer that comes on the Limited models. Feel lucky yours appears to have come from an SR5 model and should operate without any connection there. Otherwise you would have to go through the hassle of having the original key and transducer ring from the donor vehicle the computer came from.
Awesome! Thanks! It's a manual model with cloth seats and a rear elocker. But I've never seen any trim model info. I've got the title so I'm sure a vin identifier would tell me. So the black plug can be tossed? I figure I'm just going to have to pay the pied piper and get a wiring diagram. I've been trying to get it from a 2002 and 97 diagram but they arent even close.
You will need the black plug. I thought your question was concerning the open center plug. If you've read many of the threads on the wiring end of this swap the advice to go on TIS and download as many wiring diagrams as you can is money well spent. I know from my swap from a 99 auto 4Runner in the middle of 99 there were major changes and different computers.
I went ahead and bought a 2 day pass. I downloaded the 94 EWD as well as the 99,00, and 98 just to be safe. Ill start going through the wiring diagrams tonight and see if I can track all the wires.
Here is what I came up with after 10 or 20 hours of going through the EWDs. With any luck I'll get the conversion harness soldered up and done today. Then maybe this weekend or next week I'll have the engine in and ready to give it a shot. If it works maybe this spreadsheet will save someone a few headaches.
I got everything soldered up. The big red wire coming out is the starter trigger. And the eye connector is for the ground on the AC over heat switch (which was only on the A/T that I dont have any more) and for the ground side of the OBDII plug.
I found my first mistake. The new 4runner doesn't have a VSS. So it looks like I am going to have to strip the VSS wiring from the old wiring harness and splice in a plug for it on the conversion wiring harness.
I can tie directly into 13 and 19, but pin 8 has other things powered by it so I will have to make another solder joint in the wire.
I found a plug off my donor with 4 pins. I think from the windshield washer, but that is irrelevant. Luckily the wiring colors in the plug made sense. I'll track the vss wiring through the old harness and pull the three wires I need.
when i did my swap, i pulled both harness' and opened them up. cleaned the wire, removed all tape. then depinned the ECU and dash plugs. I pretty much ran each wire from sensor to plug. then made groups of wires and loomed them.
08-17-2018, 02:14 PM
