NSFW Posted January 31, 2010 Share Posted January 31, 2010 What does each wire do? http://i193.photobucket.com/albums/z151/Legacy_NSFW/Intake/MAF.jpg From left to right they are... what? Power and ground should be easy enough, it's really the other three that I wonder about. I ask because I want to feed the MAF signal into a now-unused 0-5v input that used to be connected to a TGV position sensor. I just installed a blow-through MAF sensor, and logging MAF from both the existing and new sensors should make it very easy to get the new MAF scaling correct (or at least, close) on the first try. Logging both at once should also prove or disprove a theory about FMICs, lag, and a rich dip that generally occurs right after spoolup on Subarus with big intercoolers. So again, from left to right they are... what? Thanks in advance! Link to comment Share on other sites More sharing options...
rao Posted January 31, 2010 Share Posted January 31, 2010 1. Power2. Ground3. MAF Signal4. Temp Signal5. Groound Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
Darkness of Death Posted January 31, 2010 Share Posted January 31, 2010 man....Rob... you could probably tear the car apart and put it back together ~ Link to comment Share on other sites More sharing options...
Ridgeracer Posted January 31, 2010 Share Posted January 31, 2010 He is "Too Big To Fail"...:lol: "Gimme mines Balboa...Gimme mines".....Clubber Lang - Mr. T Link to comment Share on other sites More sharing options...
Boostin1657615274 Posted February 1, 2010 Share Posted February 1, 2010 (edited) You will have to tell us the model year, it is a little different on the 05-06 versus the later ones. I have the diagrams in front of me right now. EDIT: these diagrams are confusing, they don't match up to the colors and pinout in the FSM completely. Maybe your pic is affecting the way the colors look. The middle wire is definitely MAF signal, the black/green to the right of it is MAF ground, but the other stuff is confusing because the colors don't match the pinout. In the connector pinout Subaru numbers each pin and then you have to match it to the color in the diagram. But the connector pinout, the diagram, and your pic don't match. Other manufacturers have a connector pinout with actual wire colors so it's easier to match something... Subaru is very frustrating. And then Subaru will have a wire going to another page, but they don't label what the page is (what system it's for), they just give the page number, so you have to go chase it down and figure it out. You're going to have to meter the wires to be sure. On the 05 there is power, MAF signal, MAF ground, IAT signal, and then IAT ground which is shared with the water temp sensor back near the ECU. Also note that the MAF signal wire is shielded. It is tied with the shield wire coming from pin 32 on that same B136 ECU connector. See page WI-40 in the 05 FSM and WI-65 in the 08 FSM Edited February 1, 2010 by Boostin On the search for a new DD... Link to comment Share on other sites More sharing options...
NSFW Posted February 2, 2010 Author Share Posted February 2, 2010 (edited) Thanks guys. I hooked up a voltmeter to the MAF plug and found: 1 = ground 2 = + 4.76v 3 = ? 4 = ? 5 = + 12v Presumably 3 and 4 are MAF and IAT, or vice-versa. I'm going to make a wiring harness extension to sniff those signals. I meant to stop by an electronics place and pick up some mini spade connectors that I think will work well for the flat 'pins' on the MAF sensor, but forgot to, so that will have to wait. If 3 is the shielded one (as per the FSM), that would suggest that's the MAF signal. And on the TGV position sensor connector: 1 = +5.00 v 2 = ground 3 = signal With a 1M-ohm pot attached to the TGV position sensor I was able to get a logger to read varying voltages on for the TGV position parameter. I find it a little strange that the TGV sensor gets 5.0v from the wiring harness and the MAF/IAT gets 4.76v. Anyone got thoughts on that? My car is an 05, by the way. Edited February 2, 2010 by NSFW Link to comment Share on other sites More sharing options...
rao Posted February 2, 2010 Share Posted February 2, 2010 I think you have some bad engine grounds Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
BoxerGT2.5 Posted February 2, 2010 Share Posted February 2, 2010 Solves everyones grounding problems. http://img.photobucket.com/albums/v356/eclipse6000/IMG00487-20091206-1710.jpg OBAMA......One Big Ass Mistake America! Link to comment Share on other sites More sharing options...
dschultz Posted February 2, 2010 Share Posted February 2, 2010 (edited) 1. Power (Yellow/Blue) 2. Ground (Black/Green) 3. MAF Signal (Red/Blue) 4. Temp Signal (Yellow/Blue) 5. Ground (Yellow/Green) This listing is from right to left for your picture. Edited February 2, 2010 by dschultz added colours Link to comment Share on other sites More sharing options...
Darkness of Death Posted February 2, 2010 Share Posted February 2, 2010 Solves everyones grounding problems. http://img.photobucket.com/albums/v356/eclipse6000/IMG00487-20091206-1710.jpg or you can make your own set for a fraction of the cost of something with a brand name label on it Link to comment Share on other sites More sharing options...
BoxerGT2.5 Posted February 2, 2010 Share Posted February 2, 2010 or you can make your own set for a fraction of the cost of something with a brand name label on it Maybe, but are you going to get the circular flow of current like you will with the HKS? These are all very important points to consider You shouldn't put a price on the well being of your car. OBAMA......One Big Ass Mistake America! Link to comment Share on other sites More sharing options...
NSFW Posted February 3, 2010 Author Share Posted February 3, 2010 I think you have some bad engine grounds I don't think so, the +12 at the MAF connector read the same as +12 at the battery terminals. It was actually a bit less than 12, I think I killed another battery. Link to comment Share on other sites More sharing options...
NSFW Posted February 3, 2010 Author Share Posted February 3, 2010 Maybe, but are you going to get the circular flow of current like you will with the HKS? These are all very important points to consider You shouldn't put a price on the well being of your car. You really can't beat a circular flow of ground current. Link to comment Share on other sites More sharing options...
j255c Posted February 5, 2010 Share Posted February 5, 2010 Time to hit all your grounds with a voltmeter. I did it and it solved my 3 month ongoing tps limp mode issue with my car after I tore apart my entire dash and replaced my ecu. 06 TB EVO IX SE stock turbo monster subaru hater Link to comment Share on other sites More sharing options...
papa g Posted February 5, 2010 Share Posted February 5, 2010 My sons old 92 Legacy L wagon had weird ECU problems and sensors giving crazy readings. It ended up being dirty grounds. Cleaned them up and everything went away like magic. Its amazing what a little voltage drop will do. BE committed to DO what it takes to HAVE more of what you want in your life!!! Link to comment Share on other sites More sharing options...
integroid Posted February 5, 2010 Share Posted February 5, 2010 Maybe, but are you going to get the circular flow of current like you will with the HKS? These are all very important points to consider You shouldn't put a price on the well being of your car. That is funny...I got a bridge for sale, interested? Link to comment Share on other sites More sharing options...
NSFW Posted February 6, 2010 Author Share Posted February 6, 2010 Just for fun... how to get the TGV position parameters to show whatever value you want: http://i193.photobucket.com/albums/z151/Legacy_NSFW/MiscLegacy/MockTgv.jpg Link to comment Share on other sites More sharing options...
dschultz Posted February 8, 2010 Share Posted February 8, 2010 Are you going to use one TGV input for your new MAF and the other for it's temperature sensor? Am I wrong to assume that your new MAF position would be subjected to different temperatures than the ECU is accustom to and needs. Link to comment Share on other sites More sharing options...
NSFW Posted February 8, 2010 Author Share Posted February 8, 2010 I was planning to just log the MAFv from the new sensor, to make it easier to get the MAF scaling set up. Plus I think it would be cool to make a graph that demonstrates that the "FMIC rich dip" really does come from a difference in MAF as measured at each location (or not, as the case may be). I think that the new sensor's IAT will be in the same range that the ECU is accustomed to. The turbo will heat it up, the IC will cool it down, but temperatures from my CAI go up a bit during a pull too. I dunno how it will end up, but I am curious. After I switch to blow-through I do like the idea of using the TGV sensors for pre- and post-turbo IAT just to see if I can reverse-engineer the compressor map with a spreadsheet. That's not a super high priority but it might happen. Link to comment Share on other sites More sharing options...
ClimberDHexMods Posted February 15, 2010 Share Posted February 15, 2010 After I switch to blow-through I do like the idea of using the TGV sensors for pre- and post-turbo IAT just to see if I can reverse-engineer the compressor map with a spreadsheet. That's not a super high priority but it might happen. I love this idea and might have to use it one day, but for now just like you it's on the end of a long list. [CENTER][B][I] Front Limited Slip Racing Differentials for the 5EAT now available for $1895 shipped, please inquire for details! [/I][/B][/CENTER] Link to comment Share on other sites More sharing options...
BMW530i Posted June 7, 2015 Share Posted June 7, 2015 (edited) This listing is from right to left for your picture. 1. Power (Yellow/Blue) 2. Ground (Black/Green) 3. MAF Signal (Red/Blue) 4. Temp Signal (Yellow/Blue) 5. Ground (Yellow/Green) http://i193.photobucket.com/albums/z151/Legacy_NSFW/Intake/MAF.jpg Sorry to reopen an old thread but I found it through a Google Search because I am using a Suby MAF Sensor for my Nissan Altima Turbo. Are these listing the same for the 2012+ Imprezas? And are the MAF sensors the same between the STi and WRX's? I bought a 2012 STi MAF Sens0r Edited June 7, 2015 by BMW530i Link to comment Share on other sites More sharing options...
Underdog Posted June 7, 2015 Share Posted June 7, 2015 '08+ STI got a new style MAF sensor that has a slightly higher threshold. You should be able to see the P/N molded right on the face of it. The Crimson Dynamo Link to comment Share on other sites More sharing options...
BMW530i Posted June 8, 2015 Share Posted June 8, 2015 '08+ STI got a new style MAF sensor that has a slightly higher threshold. You should be able to see the P/N molded right on the face of it. Thank you but that doesnt quit answer my question. I gather that the STi uses a different MAF sensor than the WRX? And are the pinouts still the same as the picture? The metal ears are reversed (180degrees) on the sensor that I have. Link to comment Share on other sites More sharing options...
Underdog Posted June 8, 2015 Share Posted June 8, 2015 (edited) On the '08+ STI MAF (P/N 22680AA380) the pin-out is as follows (looking into the connector on the MAF side, with the retaining tab up, left to right). 1. Temp Signal 2. Ground 3. Power 4. Ground 5. MAF Signal Not only are the mounting ears mirrored - the shoulder with the o-ring groove is a larger diameter on the '08+ STI MAF, and cannot be installed in '05-'09 LGT/OBXT housings. Edited June 8, 2015 by Underdog The Crimson Dynamo Link to comment Share on other sites More sharing options...
BMW530i Posted June 9, 2015 Share Posted June 9, 2015 On the '08+ STI MAF (P/N 22680AA380) the pin-out is as follows (looking into the connector on the MAF side, with the retaining tab up, left to right). 1. Temp Signal 2. Ground 3. Power 4. Ground 5. MAF Signal Not only are the mounting ears mirrored - the shoulder with the o-ring groove is a larger diameter on the '08+ STI MAF, and cannot be installed in '05-'09 LGT/OBXT housings. Thank You! I'm not using it on a Subaru though. I'm using it on a Nissan Altima Turbo project. Everything is installed but the stock Nissan MAF is teh suck. Link to comment Share on other sites More sharing options...
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