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Old 06-12-2008, 12:18 AM   #1
Pierrot
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Default atmospheric pressure sensor???

so my gc8 with a v2 sti swap is cutting off fuel threw obd1 code 45 of atmospheric pressure sensor fault and so... I need to find the part number for it and was hoping someone could help me out. I'm guessing I have to replace it :/
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Old 06-12-2008, 11:35 AM   #2
Legacy777
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Code 45 for the turbo cars is the pressure sensor & pressure exchange solenoid. I'm pretty sure the pressure sensor and associated exchange solenoid will also be on the passenger strut tower. If so, it should be black and rectangular. You can kind of see it in this picture
http://www.main.experiencetherave.co...2/DCP_6012.JPG

If you can find it, see if there's a part # on it.

Josh
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Old 06-12-2008, 01:13 PM   #3
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oh so your talking about the black one? #1 on picture? i hope so because i cant read part numbers on the other two they are too faded :/. I hope its not number 1 though lol i looked up the part number and it was like 320 dollars! ugh


Last edited by Pierrot; 06-12-2008 at 01:21 PM.
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Old 06-12-2008, 02:24 PM   #4
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*i think*
1 map sensor
2 purge solenoid
3 is bcs
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Old 06-12-2008, 03:20 PM   #5
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bcs? whats that stand for?
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Old 06-12-2008, 03:32 PM   #6
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On the very bottom of number 3 there is a hose attachment. Do i plug that into the air intake? because If i plug it closed my boost stays at 10 psi and no fuel cut. but if i attach it to the air intake my car falls on its face. as soon as it passes 10 psi. This is my problem and this is why i checked the CEL and found out its code 45.
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Old 06-12-2008, 11:42 PM   #7
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1 is 22012AA020 ''turbo pressure sensor'' by the part number and if I replace this part I should be ok? or should I also get #2- 14774AA340 ''pressure exchange solenoid''? still don't know what number 3 is though the tag is gone

Last edited by Pierrot; 06-12-2008 at 11:51 PM.
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Old 06-13-2008, 11:44 AM   #8
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Jaxx is correct on the sensors.

BCS - Boost Control Solenoid

The hose at the bottom of number 3 needs to be put back into the air intake. If you plug that line, you're essentually running boost pressure directly to the wastegate diaphragm.

You need to double check the wiring and make sure everything is good before you replace the pressure sensor. That pressure sensor is the same one that is on the first gen turbo legacies. So after you check the wiring, and confirm it's good, I'd recommend getting a used pressure sensor. You may want to post in the parts shed on www.bbs.legacycentral.org and you only should have to replace the pressure sensor, and not the exchange solenoid.

Do you have a steady Check engine light, or does code 45 just show up when you check the codes? Have you tried clearing the codes? You can do the battery method or I have another procedure on my site
http://www.surrealmirage.com/subaru/....html#resetecu

Josh
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Old 06-13-2008, 01:01 PM   #9
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Thanks for all the help!

Yeah thats what i thought about the hose...

I will recheck and see if the wiring to the sensor is still good today.

The thing is its a gc with a swapped ej20g which is obd1. the wiring was done by ECS and i kinda talked to them through emails (tried calling but no answer, guess they were busy) and they said to hook back in the green connector under the dash(the one that throws program codes?) and see what code its throwing via the slow blinking to fast blinking and thats how i got code 45 constantly no other change. but with it unhooked it just stays on for a period of time and when speeding up occasionally turns off.

also did the battery thing and no change
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Old 06-17-2008, 12:52 PM   #10
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If the light just stays on, the code is an "active" code meaning the fault is currently occuring vs. having occured in the past.

However based on your description of how the CEL comes on and off intermittantly, I'd almost suspect a wiring problem, so make sure to check the wiring very thoroughly.

Josh
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Old 06-18-2008, 12:04 PM   #11
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If the green connector is plugged in for it to throw whatever codes the obd1 is. It throws the code 45 constantly non stop
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Old 06-18-2008, 02:12 PM   #12
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Quote:
Originally Posted by Pierrot View Post
If the green connector is plugged in for it to throw whatever codes the obd1 is. It throws the code 45 constantly non stop
Yeah....that's normal.
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Old 07-15-2008, 09:51 PM   #13
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so I got my hands on the pressure sensor and the old one had really ugly bad ripped wires. replaced it and now I can step on it fine when the check engine light isn't on. but then the cel comes on randomly. but a lot less then before and bam, same problem
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Old 07-16-2008, 08:30 AM   #14
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Is it the same code? Pressure sensor?
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Old 07-16-2008, 10:24 AM   #15
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yes sir. it comes up a lot less but still does randomly. I connected the green connector and for a little while no codes were being thrown. then bam yet again. same code
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Old 07-16-2008, 04:41 PM   #16
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Hmm....that sounds more like a possible wiring issue, OR a flakey sensor.
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Old 07-16-2008, 05:26 PM   #17
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the sensor is new

ugh but the car is now ALOT stronger so i know the previous sensor was just ruined

And when that CEL comes on it will do it again. ugh... but when its not, im all normal. Where can i find the ecu pinout for my ver2 so i can hook up a a/f ratio gauge so i can atleast know if im leaning out.
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Old 07-18-2008, 12:43 PM   #18
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I'm not sure about the wiring diagram. You may want to ask in the electrical or engine management forum.

Where are you located?
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Old 07-18-2008, 02:02 PM   #19
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houston tx
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Old 07-19-2008, 10:58 AM   #20
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Well maybe I can help you troubleshoot it, if you can't get a hold of a wiring diagram.
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Old 07-21-2008, 02:21 PM   #21
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that would be awesome. what is stock boost for these cars? my car went to 16 psi and I dont think it should be that high lol
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Old 07-22-2008, 01:28 PM   #22
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I think some where around 14 psi.

Drop me a PM if you would like some help troubleshooting.

Josh
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Old 08-05-2008, 04:57 PM   #23
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Quote:
Originally Posted by Legacy777 View Post
I think some where around 14 psi.

Drop me a PM if you would like some help troubleshooting.

Josh
sorry i havent gotten here often been busy,

But i was checking to see what boost i was putting and it went as high as 18 and it worries me. And i did more looking around and found 2 lines that were open.

I looked for pictures of other ver2's and found i didnt have this



the two little arrows are the lines that are now empty and the canister was never there. Do you happen to have a part number? So i can go get one
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Old 08-05-2008, 05:49 PM   #24
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thats the charcoal canister its the vent for the gas tank (the reason there are 3 fuel lines)
go to the junk yard most of the obd-1 subarus have them its an "emmissions device" so them may try to stick you
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Old 08-10-2008, 07:39 PM   #25
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would you get that code from over boosting? sorry i don't know OBD 1 well enough to know if that is the code for over boost or not. with over boost you get fuel cut for a moment and then the car would drive normally again until you over boost again. just a thought
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