Why does the turbo run a power wire to the ignitor?

[Matt Monson]

This just doesn't make sense to me. The NA BC/BF cars don't run a hot wire (yellow) to the ignitor. The JDM turbo cars don't either. Why did they do this on the USDM turbos?

On all the other cars, the ignition switch and the fuel pump and main relay are all tied together directly to the coil. On the USDM turbo this same circuit includes the ignitor, and excludes the coil. The coil gets it's power on a different circuit that also has it running through an additional fuse.

What's going to happen if I take the pair of circuits on the USDM turbo car and join them? I think it will work just fine but want to be sure. This is relevant because I am converting it to coil on plug for an Ej20G ECU.

The only other time I did this, I did it on an NA car and this didn't come up. It's confusing me a bit. Your thoughts?

[Matt Monson]

30 views and not a single member knows what I am talking about?

[555BCTurbo]

I understand what you are getting at Matt, but I am as stumped as you are...

[Legacy777]

Matt.....I don't really see any reason why you couldn't do what you're doing.

The only thing I can think of is that the existing circuit on the n/a & overseas cars is more lightly loaded then the turbo cars....and because of that....Subaru put the coil on a separate circuit.

What I would do is follow the power supply routing and try and identify if there is any additional loads for the turbo car where the fuel pump, ign switch, etc are tied to vs. the n/a cars.

Short of that.....I don't really know.

[Splinter]

Theres no power wire in the circuit diagrams I have... and theres no power pin on the ignitor for my 92 4EAT Turbo

Any pictures?

[93forestpearl]

Looks to me on the NA car the ijnitor gets its power from the ECU. Why, I dunno.

I don't remember what I did about my ignitor power when I wired the Link.

When I wired up my Link, I was stumped about what to do with the ign coil power. The manual for the ECU says to have the ign coild power switched by the fuel pump. These cars don't do that and it wouldv'e been a pain. Plus I don't know if that relay can handle that much more current. I left it as is and put the suppressor right by the ign coil plug.

I'm not shure if you want to run the ignitor on the same circuit as the coil. They could give each other interference, but I'm not the guru in that department. You could run it off the igniton relay or fuel pump relay. I can't believe the ignitor would draw that much.

[Splinter]

The ignitor is just 4 transistors that act like tiny tiny relays, when they get a signal from the ECU, they open up a path to ground for the coil

[Josh Long]

This seemed to make sense when I was rewiring my outback. I will have a look at the diagrams of this area when I get home . (if I remember, I suffer from CRS)

I believe I also have a diagram of the COP style early Liberty.

[Matt Monson]

So,
After reviewing the diagrams long and hard, I decided to do it differently than I described above. I just used the coil power wire that was already running through the intake manifold harness. We are using the Ej22T harness, so I just patched in the split 4 way power wire from the COP harness into the single wire that used to power the Ej22T coil. I just cut and put a cap on the power wire to the ignitor. If for whatever reason it doesn't work when we try to fire up the car, we will revisit the joint circuit solution. We'll know come Saturday whether or not this works or not...

[s'ko]

Matt.. did this patch work?

I am running into the same problem with the wiring and I am stumped

BW