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Previous Next Up Topic Engines / Subbug - Subaru Power / Help plumbing on EJ25 (2968 hits)
By Paul Moran (DBA Architect) Date 2007-09-14 03:27
So the EJ25 is throwing a P1143 code ("P1143 manufacture control fuel air metering") and I think I have the problem cause tracked down.  Any one out there have an EJ25 factory set up (preferably from a 1997 Subaru Legacy) who could help me reconnect the hoses around the MAP sensor?

Here's what I think I did wrong.  In my plan to remove "excess" from the engine, I thought I was removing the charcoal canister purge control solenoid.  I think instead that this solenoid allows the MAP sensor to read both manifold and atmospheric pressure by alternating the solenoid back and forth.  Well... I just have a MAP sensor plugged into the manifold now and its throwing a code.

I have to locate the solenoid (was planning on using it as an idle control solenoid possibly) so first I have to find it.  I also found this page that describes how it may be connected in a stock set up:

From these diagrams, it looks like there is a 3 port solenoid.  When I find mine, I need to know which port hooks to where (map, manifold, filter, atmosphere?).

I solved the last major code today which was a rear o2 heater malfunction.  I've been working with Tom on a simulator for a rear O2.  Well I hooked up just the heater portion of an O2 sensor (the rest was just zip tied to the rear cage), and the code has not reappeared. 

Thanks, Paul...
Chicago, IL
EMPI Imp 1002 ('69)/Subaru EJ20 Turbo/LinkPlus ECU
Previous Next Up Topic Engines / Subbug - Subaru Power / Help plumbing on EJ25 (2968 hits)

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