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Old 01-10-2012, 01:55 PM   #1
Scooby Newbie
Member#: 269173
Join Date: Jan 2011
Chapter/Region: NESIC
Location: Gilman, VT
2000 Impreza OBS

Default EJ25 Phase I to Phase II CPS wiring solution

I did search the forums and people mentioned that an EJ25 Phase I wiring harness will work on a Phase II intake and engine with the exception of there being two plugs for CPS's on the Phase I harness and only one sensor on the SOHC Phase II engine. How do I get the ECU to be happy with one signal, or is there a workaround?

If this has been answered previously I apologize but I have been a month without a car and am in a time crunch.
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Old 01-11-2012, 11:13 AM   #2
Patrick Olsen
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Member#: 120
Join Date: Jul 1999
Chapter/Region: AKIC
Location: Where the Navy sends me...
1997 Legacy 2.5GT
1996 Impreza coupe


I assume by CPS you mean cam position sensor? Or do you mean crank position sensor?

Either way, there's only 1 of each on the EJ25D (Phase I EJ25), and the sensors themselves are the same as the Phase II sensor. I don't know if the trigger patterns are the same, but I imagine they're probably not.

I've seen very, very few examples of people successfully mixing the two phases. (Mechanically, it's not an issue - there are plenty of engines, including direct from the factory, that have the Phase I EJ25 DOHC heads on a Phase II EJ25 block. Electrically is where it becomes hard.) Actually, I only know of 1 example, and the details of how it was done were a bit lacking. See this thread, and scroll down to the post by mechman900.
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