910GL Posted May 29, 2020 Share Posted May 29, 2020 (edited) Figured I would post this here because its relevant to my donor motor and not to the car its going into. From a 99 Legacy EJ25D with auto trans. Putting this motor into a GL, do I need this or is it "fine" to just cap the vacuum from the intake which feeds it? Both number 1's in the FSM: Thanks in advance, Brett Edited May 29, 2020 by 910GL Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted May 30, 2020 Share Posted May 30, 2020 You absolutely need that. GD Quote Link to comment Share on other sites More sharing options...
910GL Posted May 30, 2020 Author Share Posted May 30, 2020 (edited) 1 hour ago, GeneralDisorder said: You absolutely need that. GD Copy, thanks. So lets hypothetically assume that the plug for the boost sensor was inadvertently cut out of said harness for the swap (the switching solenoid is there). Am I reading this diagram correct to rectify this situation? (I'm a hydraulic mechanic by experience; I am no electrician - hence why I had someone else trim my harness). Tie terminal pos#1 into terminal pos#2 of the B21 connector Tie terminal pos#2 into terminal pos#26 of the ECM Tie terminal pos#3 into terminal pos #3 of the B21 connector Or I guess I could just run all three back to the ECM? Thanks Brett Edited May 30, 2020 by 910GL Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted May 30, 2020 Share Posted May 30, 2020 A and B are likely power and ground. Probably 12v but you need to follow the diagram. And you need to hookup the switching solenoid as well. FYI this sensor is critical for the computer to make fuel corrections based on altitude. GD Quote Link to comment Share on other sites More sharing options...
910GL Posted May 30, 2020 Author Share Posted May 30, 2020 (edited) 24 minutes ago, GeneralDisorder said: A and B are likely power and ground. Probably 12v but you need to follow the diagram. And you need to hookup the switching solenoid as well. FYI this sensor is critical for the computer to make fuel corrections based on altitude. GD Thanks for the info, I was trying to research what it was for - all I could find was that it had something to do with "atmospheric pressure" so this makes a lot more sense now. I suppose its not AS critical in my situation (I live at the coast and this car doesn't travel much, so no elevation changes) but I still want to get it hooked up. The switching solenoid is still in the harness so I'm good on that end. It looks as though both A and B terminate at the fuel tank pressure sensor. Edited May 30, 2020 by 910GL Quote Link to comment Share on other sites More sharing options...
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