Geoff F Posted November 19, 2020 Share Posted November 19, 2020 (edited) Hey all. Starting a new thread because it's been awhile since my last post about this topic. Long story short - I have a 2009 Subaru Impreza 2.5I that I did a JDM boxer engine (EJ253) swap with. Everything went smooth except I am getting a P1491 code (PCV sensor error). This is because the boxer engine I put in physically does not have the sensor itself and therefore the ECM from the car is not picking anything up on its end. So after some digging through the FSM I think I found the correct pins where I can put a resistor or jumper on the ECM to artificially complete the circuit and bypass the code. The only problem is that those pins are currently occupied and I am nervous that they may be running to something else. Could JDM just have capped the ends of these two wires somewhere in the harness or are they actually being used? Does anyone have any experience with this? I'm attaching some photos for reference. Picture 1: Wiring diagram found in the FSM. My plan is to put a resistor between pin 41 and pin 45 on B21 (wiring harness from the boxer engine) Picture 2: The back of the wiring harness from the boxer engine. Note that pin 41 is occupied by a yellow / red wire while pin 45 (hard to see) is occupied by a solid orange wire. Appreciate all the help and let me know if my logic is flawed! - Geoff Edited November 20, 2020 by Geoff F update Quote Link to comment Share on other sites More sharing options...
Myco Posted March 26, 2022 Share Posted March 26, 2022 Yellow red is positive did you put resistor before you ground it?can you send me a picture how did you set it up thanks. Quote Link to comment Share on other sites More sharing options...
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