98 ej20 AWD Auto ECU wiring diagrams

drof351 · Post by **drof351** » Sun Jan 10, 2010 7:13 pm

Hi guys, I'm chasing the ecu wiring diagram to suit the 98 Subaru Impreza AWD auto EJ20. It has a single plug into the ecu held in with a 10mm bolt. Thanks

Gannon · Post by **Gannon** » Sun Jan 10, 2010 7:17 pm

drof351 wrote:It has a single plug into the ecu held in with a 10mm bolt.

Are you sure???

Sounds to me more like the SMJ (super multiple junction)
Its a large connector that joins the engine wiring with the bulkhead (underdash) wiring.

Most ECU's had 3 plugs

drof351 · Post by **drof351** » Sun Jan 10, 2010 7:23 pm

The engine is in my L, running, and all the wires from the engine go to this single plug?

Gannon · Post by **Gannon** » Sun Jan 10, 2010 7:31 pm

Post up a pic.

There are 2 files here that you can download (173mb total)
PDF-Subaru-Impreza-1997-1998-Service-Manual.html

drof351 · Post by **drof351** » Sun Jan 10, 2010 7:42 pm

Here you go, The "ECU" and wiring are just resting on the engine until I can finish finding all the wires. The car is running and driving, auto is changing etc. Just want to find the temp gauge wire, tacho, oil light, pedal switch, power button etc

drof351 · Post by **drof351** » Sun Jan 10, 2010 8:21 pm

Suparoo wrote:Post up a pic.

There are 2 files here that you can download (173mb total)
PDF-Subaru-Impreza-1997-1998-Service-Manual.html

I can t seem to get this to work? Do you think its the right one?

SuBaRiNo · Post by **SuBaRiNo** » Mon Jan 11, 2010 10:09 am

I might be able to help... can u remove that white plastic cover off the ECU plug there?

Is the car running and mobile?? Where are u located... im 20mins north of Perth.... if your able to bring it over sometime i can definately help.

I have done heaps of these and never seen a ECU plug bolt on like that or have that cover. Im wondering if the bolt is just for the cover or to hold the plug in.

Temp and oil don't come out of the ECU they come directly from the motor so an ECU diagram wont help with that but i could be some assistance in locating them for u.

Dave

SuBaRiNo · Post by **SuBaRiNo** » Mon Jan 11, 2010 10:10 am

Ohh... and PM me if i don't reply on here... i lose posts sometimes and im not on here often.

Dave

vincentvega · Post by **vincentvega** » Mon Jan 11, 2010 10:24 am

is it a late 98 (gen3) or early (gen2) engine? Looks like a gen3 from the air cleaner.

i have the diagrams for the early stuff.

97 on is an integrated ECU / TCU. all done in the one unit

Gannon · Post by **Gannon** » Mon Jan 11, 2010 3:21 pm

vincentvega wrote:97 on is an integrated ECU / TCU. all done in the one unit

No its not, the TCU and ECU are separate. Newer cars with CAN-Bus systems may be different.

The ECU is usually located in front of the passenger footwell and the TCU is up beside the steering column.

Id say from the airbox is more likely from a 2007 onwards, which may explain the single plug ECU that we have never seen before

Jeff · Post by **Jeff** » Mon Jan 11, 2010 4:26 pm

The 97/98 2.0 auto Impreza is exactly like Vincentvega said. I have own several and the ECU and TCU are one and the plug is bolted to it

vincentvega · Post by **vincentvega** » Mon Jan 11, 2010 4:39 pm

Suparoo wrote:No its not, the TCU and ECU are separate. Newer cars with CAN-Bus systems may be different.

mate I have an integrated TCU / ECU sitting on my desk. dont tell me they dont exist.

The ECU is usually located in front of the passenger footwell and the TCU is up beside the steering column.

On some models this is true. on others its not.

Don't assume just because you know something about a particular model that it applies to all cars.

Gannon · Post by **Gannon** » Mon Jan 11, 2010 6:36 pm

Looks as though i may have been wrong

I know 1998-2003 Liberty's are separate, 1989 to 1993 liberty's are separate and the 2002 Impreza's is separate, so yes i assumed that all others must follow suit.

So what cars came with the intergrated ECU/TCU?

drof351 · Post by **drof351** » Sat Jan 16, 2010 5:12 pm

So no ideas on getting a wiring diagram?

vincentvega · Post by **vincentvega** » Sun Jan 17, 2010 9:04 am

vincentvega wrote:is it a late 98 (gen3) or early (gen2) engine? Looks like a gen3 from the air cleaner.

??

............

drof351 · Post by **drof351** » Wed Jan 20, 2010 10:53 pm

Hi guys, I have decided to try to sell my Wagon, its licenced, running and driving just needs a few things to finish it off. Anyone interested please contact me Make me an offer thanks