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Old 02-04-2011, 04:49 PM   #1
rpg5553
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Default EJ20G Turbo Motor In Porsche 914 Getting Code 45

Greetings,

I put a 95 EJ20G (JDM) turbo motor in a Porsche 914 and It runs fine until the turbo kicks in, then it falls on it's face Pulled the codes and got a code 45 which says turbo pressure sensor. Found out this is a pretty important part which I am missing

I started looking around for this sensor with no luck. Is there any other car that uses this particular sensor or do I have any other options? Found out it is a denso part number 22012AA020 if that helps.

Also, as I made up my own wiring harness I found out I needed a VSS. Looking on the web I found out where someone grounded the PARK pin on the ECU and that bypassed the VSS and kept it out of limp mode. Can any one verify that.
Thanks for any help.
Ronnie G
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Old 02-04-2011, 05:17 PM   #2
sawtooth
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'73 914 suby

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Cool, this is 914 day in the Conversion forum. Got any pics of your project?
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Old 02-06-2011, 09:38 AM   #3
rpg5553
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Default Got to get the camera out

sawtooth

I just checked out your build and it looks great. Wish I would have gone with the suby trans but decided to use the base Renegade kit. Figured I have been shifting the old 901 tranny for 10+ years so kinda used to it.
I took a few pictures starting out then got pulled into the build and forgot to take any more. I'll get the camera out when it stops raining in Atlanta,
supposed to be nice today and get some pictures.
Mine has been on the road for a few months but having an issue when the boost gets up. It will give you whiplash till about 4K then drops off.
Missing a turbo pressure sensor so suspect that is the culprit causing my boost problems.
Enjoy your teener
Ronnie G
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Old 02-06-2011, 10:11 AM   #4
Jaxx
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The 93 Imp W/EJ20K
flat black

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for what its worth its also its more commonly referred to as the MAP sensor
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Old 02-06-2011, 05:30 PM   #5
rpg5553
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JAXX,

Guess I am confused on terminology on what this part is that I need.
I picked up a pressure exchange solenoid from Pull-A-Part from a 95 Impreza non turbo. There was a map sensor attached to the pressure exchange solenoid with a hose with a part number of denzo 22012AA070.
From looking on the web it looks like I need something from a turbo to resolve my code 45 issue. Am I on the right track looking for a turbo pressue sensor denzo 22012AA020. Hope this helps.
Thanks
Ronnie G
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Old 02-07-2011, 10:20 AM   #6
Jaxx
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map = manifold absolute pressure

a n/a will always have vacuum so they use a 1 bar sensor -full vacuum to atmospheric

turbo charged cars (hopefully) have positive manifold pressure and use a 2 bar (or more) full vacuum to +14.5 psi

truth be told the part you need is not a 2 bar its more like a 2.4ish bar.. and sensor outputs are not standardized so you need the original part

i would triple-quad x2 check my wiring and ground before i ordered one, as its not a common failure
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Old 02-13-2011, 06:55 PM   #7
gtu89rx7
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make sure you have the pressure exchange solenoid wired in, if it is not it will show code 45 also. the pressure exchance solenoid switches the signal from the boost line from the boost sensor to atmosphere so the ecu can get a reading on atmospheric pressure.

i am also looking for a map sensor, but cant find one cheap. I am currently using a GM 2 bar map sensor, which is close enough to not throw codes
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Old 02-13-2011, 09:35 PM   #8
a914622
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As far as your Vss there are a few options. There are ones out there that simulate VSS. depending on the computer you are using that may be all you need. I had it work and at 2k the computer learned and started throwing codes
There is also the smallcar set that bolts to the CV. good option.

You can also rework the 914 ERG box. You need to pull apart the subaru speedo and put the magnet ring in the erg box. Thats what i did on my vanagon. works good


Search vvs on the vanagon subaru yahoo group.

jcl
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Old 02-13-2011, 09:58 PM   #9
a914622
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Old 02-19-2011, 07:39 PM   #10
rpg5553
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Default Boost Or Limp Mode.

Thanks for the replys,
So does the pressure exchange solenoid and turbo pressure sensor both use vaccum? I have a pressure exchange solenoid denso # 14774aa500 currently hooked to two vaccum lines. Got it from a 95 n/a Impreza which said it should replace the 14774aa341 that would have came with my engine.
A vaccum hose from it goes to the Turbo pressure sensor which I just picked up. Got three wires, two going to ecu. 5v and signal and another wire for ground. When I wire it up like this the engine will start and then die. Pull the turbo pressure sensor wires off, engine fires up and runs fine except for my boost issue. I am not sure if the engine is in limp mode or is getting boost cut. If I take it out and accelerate hard boost will go to 8 psi and engine will shut down. I can accelerate slowly and pull 12-14 psi boost and engine will rev to 6k. Does this sound like limp mode or getting boost cut. Anyone have a clue on what is going on with it?
Thanks.
Ronnie G
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Old 05-07-2011, 01:19 PM   #11
ruby914
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Quote:
Originally Posted by a914622 View Post
As far as your Vss there are a few options. There are ones out there that simulate VSS. depending on the computer you are using that may be all you need. I had it work and at 2k the computer learned and started throwing codes
There is also the smallcar set that bolts to the CV. good option.

You can also rework the 914 ERG box. You need to pull apart the subaru speedo and put the magnet ring in the erg box. Thats what i did on my vanagon. works good


Search vvs on the vanagon subaru yahoo group.

jcl
I got a VSS from Smallcar http://www.smallcar.com/index.php?di...iew&page_id=15 but I am not so happy with it.
It seems to work on and off, not sure why??
I look for a better plan.
The problem I find is most aftermarket VSS are not 5 pulse per rev.
I am using both the WRX speedo and ECU so that is what I need.
I saw a link for a fix on the Vanaru's instrument cluster but I don't recall that would work with the Subaru gauge.
I like the Idea of going from the Trans output shaft like this: http://www.914world.com/bbs2/index.p...&hl=sti&st=260
Maybe you can get Scott to update his thread for more info.
I think we still need 5 pulse for the ECU but if your using a different speedo I think you would need a pulse to match the speedo
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Old 05-16-2011, 03:22 PM   #12
charliew
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RPG I know it's been awhile since you posted about the map sensor problem but I just read about your last question. When my son and I worked on his motor we made a new cold air intake and used the original map sensor. When we tried to start the motor it wouldn't run good. My son found the answer on nasioc. We had the map turned around backward in it's mount.
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