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Discussion Starter · #1 ·
Some day I'm going to get around to installing this XR4Ti ECU I have, but at the moment I'm not even sure how to remove the stock one. I went poking around under the dashboard and it appears to be tucked way up on the left side of the steering column behind the fuse board and God knows how many wires. I then took a panel off the dashboard, the one right behind the wiper/signal controls, which gave me no access at all. So how do you get to this thing without removing the whole dashboard?
 

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If you have some time, and really really what a real easy way to swap the ecu. Try removing the steering column and the gauge cluster. Lots of room up there then.

Basically, the ecu is held on a tray of sorts with a plastic clip. The wiring is fastened to the ecu with a bolt, either 8mm or 10mm, I'm leaning more toward the ten at the moment.
 

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Discussion Starter · #3 ·
Is that the only way to get to it? Can it not be removed somehow from underneath the dashboard? Strangely, I can't find anything about it in the shop manual.
 

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I've got fairly large hands, and skinny arms, but I can get the ECU out no problem. Move the seat back all the way, crawl under the dash, take a wrench (gear wrench to make things easier) and take off the wire harness to the ECU; I also believe it's a 10mm. Once you get the wire harness out of the way, the ECU is easier to take out. Mine has no plastic clip, so it moves around...not good, and it's something I'll remedy eventually.

Once the clip is removed the ECU will slide out relatively well. The issue is with it running into the carpet on the firewall for me. Just press a little bit, and pull the end down, there is room above the tray for the other end to go up. And it'll come right out.
 

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Discussion Starter · #6 ·
Great, now I have an even bigger problem. I tried putting the new ECU in today, and when I went to start it up I didn't hear the fuel pump switch on. I switched back to the original ECU, same deal. What could I have messed up down there that would disable the fuel pump? I went around checking all the connectors, so I'm pretty sure I didn't unplug anything.

One thing is, I did forget to disconnect the battery before I took the original ECU out, but then I remembered and disconnected it before installing the new one. Could that have ruined something?
 

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Discussion Starter · #8 ·
Yeah, there appear to be two relays under there, one of which I assume is for the fuel pump. They're kind of dangling about, but they're plugged in for sure. I doubt anything happened to them, but I'll keep it in mind.
 

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Discussion Starter · #9 ·
Will the fuel pump even switch on without a functional ECU? I'm trying to determine if this is some kind of freak accident where both my ECU's are damaged, or something else, like the fuel pump actually going out (though that would be an incredible coincidence, since the car started fine the day before I attempted the swap).

I'm at a total loss here, I literally have no idea what happened.
 

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Check the wires going to the plugs for both of the relays EEC/fuel pump relay. You may have pulled one of them out or broke the wire. The two relays are supposed to be mounted on the ECU bracket. If you didn't take them off yourself you probably pulled them off when you pulled on the ECU getting it from underneath the dash and probably broke a wire. The green'black relay is the fuel pump relay and the brown/black one is the EEC relay. One of the wires burnt on the EEC relay on my dad's 94 Escort once and caused a no start. That one took us a while to find. The wire was still attached just burnt where it wasn't making any contact.
 

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Discussion Starter · #11 ·
Thanks guys, I finally found it. It was a wire going into the fuel pump relay after all. Its connector had just barely pulled out the plug, and it still doesn't want to stay in very tightly.
 
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