With the ea82/ej22 swap, what part of the EJ wiring harness do I need? Just the engine harness, or the harness from the whole car?

You need from the ecu, through the dash to the steering column, and then out to where it plugs into the engine harness.

To do the cut down you DON'T need the wiring to the rear of the car. But the wiring/plug for the fuel pump is nice to have. Aftermarket wiring can be used too though.

 

First time playing with efi wiring? If so, don't let it get the better of you!

 

Label all engine plugs! Then strip wiring of the conduit to expose all the wires. From here I traced the wires from the plugs back to the ECU, taping those wires together every foot or so (or when other wires weaves through the ones I needed) right back up to the ECU. Then with any remaining wires that we're loose from the ECU they were taped together too/marked as important as appropriate.

 

Enter the wiring diagrams. Those loose wires - trace to the ECU plug, find which PIN number they are (plug diagrams are when looking at the plug from the ecu's perspective back at the plug). Find out what the wire is for and label it. These wires generally stay in the vehicle to be tapped into the L series harness - usually via a fuse panel to protect the two looms from failure cussed by the other loom (that's the theory anyway. I've not had a fuse pop with mine).

 

Once you know what all the wires are it's time to wrap it back up again. I used electrical tape, spiral wrap, then electrical tape after I had the shape I wanted. It can be done in the car (can be painful) or on the floor.

 

Most of all have fun with it and remember your end goal when the going gets tough. If it's over whelming, have a cuppa/read the paper then go back to it with a clearer mind frame

 

Cheers

 

Bennie

Thanks the advice. I need to get a donor car for parts. Only bought the Ej. Or find a harness and ecu on line.

If you're going with the harness and ECU online, ensure it comes with the engine intake manifold harness too - unless you're certain it's the same loom as what's on your ej22.

 

Over here we got two and three plug intake manifold looms for the same Gen engines - generally in Gen1s, the difference being the series 1 and 2 setups (my experience anyway, I've not had much to do with Gen2s).

 

Cheers

 

Bennie