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.
EMPI Imp 1002 ('69)/Subaru EJ20 Turbo/LinkPlus ECU
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