EJ22 to EJ22T wiring problems

[hellosubaru]

Short version: When I hook up the NA ECU with the harness pinned as NA, the car will start and run for 10-15 seconds. When I hook up the turbo ECU with the harness pinned as turbo, I get nothing. Any ideas?

 

Long version: So I've been wanting to do an EJ swap forever, and the time finally came. I got a '91 Legacy donor car for free, because it had a bad tranny in it. While I was pulling the engine, I found all the parts on USMB for an NA-T swap (ECU, heads, turbo, exhaust stuff, sensors, etc.). So I swapped all the turbo stuff on. Installed the engine, and got all the wiring done.

 

I plugged in the NA ECU first to see if it would start. It started right up, ran for 10-15 seconds real smooth, then just quit. Only code was 49, which is improper MAF sensor, since the turbo MAF sensor is hooked up.

 

I thought maybe the NA ECU was bad, so I repinned the harness to turbo (swapped cam/crank sensor pins at ECU, added in the turbo sensors, and that's it). When I turn the car to ON, I get nothing. No check engine light, no FP relay. The main relay clicks though.

 

Any ideas at all what is going on here? It's almost like the turbo ECU doesn't get any power for some reason. I have two turbo ECUs, and neither of them work. The NA ECU still works fine though (except for the harness being pinned as turbo). Any help is greatly appreciated.

 

Thank you,

-Jason

[Caboobaroo]

Almost sounds like the same issue I'm having with my swap. I have a EJ22T harness and everything in my '87 but the ECU isn't grounding my FP relay and my main relay isn't clicking:-\

 

I'll be watching your thread closely and hopefully someone can be most helpful:grin:

[hellosubaru]

Also if it matters, the Legacy donor car was an auto, swapped into a GL 5spd.

[suberdave]

If you shoot some starting fluid in the intake then crank it, will it fire?

 

do you have spark? do you have injector pulse? with the Turbo ECU?

 

have you tryed swaping the NA ECU back in and firing it again?

 

-=Suberdave=-

[Turbone]

Also if it matters, the Legacy donor car was an auto, swapped into a GL 5spd.

 

Neutral safety switch?

[hellosubaru]

If you shoot some starting fluid in the intake then crank it, will it fire?

 

I haven't tried this yet.

 

do you have spark?

 

It doesn't look like it, but when I have key ON, I can hear a humming sound coming from what sounds like the coil pack.

 

do you have injector pulse? with the Turbo ECU?

 

Also doesn't look like it. I unplugged injector #2, put a test light between the pins, cranked, and saw nothing.

 

 

have you tryed swaping the NA ECU back in and firing it again?

 

Yes I have. If I swap back to the NA ECU, the FP relay clicks, FP primes the system, and I get backfire, because the cam/crank pins are swapped.

 

-=Suberdave=-

 

 

Neutral safety switch?

 

Not hooked up. Wouldn't the FP relay still click on and the FP prime the system, even if this wasn't hooked up? I have no idea if it would or wouldn't.

 

Thanks,

-Jason

[Caboobaroo]

Not hooked up. Wouldn't the FP relay still click on and the FP prime the system, even if this wasn't hooked up? I have no idea if it would or wouldn't.

 

In theory I think it matter. If the neutral safety switch isn't wired in, then the engine shouldn't even crank over. Now I bypassed the EA82 neutral switch since I was originally a 3AT but the ECU gets a signal from the TCU to tell it that the trans is either in Park or Neutral...

 

 

 

Maybe I figured out my issue?!?!?!?!