Fel2 Posted November 20, 2015 Share Posted November 20, 2015 Hey, ive been reading quite a while on this forum, you seems to know what you are doing. Allright, i am still hunting my iac trouble, for 2 weeks now Wont idle at all seems to be running on 3 cylinder like it should do when code 24 show up. The car only give code 24. Ej20g 1994 jdm Rob tune Coil on plug Fuel pressure OK Spark plug 2000km Timing belt new 1 month Fuel filter 3000km Now, without the iac solenoid conected, i am getting ground 12v ground to the plug When i connect it, i am getting the 12v on the 3 wires At first, i was getting 12v 12v 1v But by the week, i am now stuck with 12v everywhere Ive tested all ground wire at the ecu and they looked fine. Ive tried running separe wire directly from the ecu to the iac, same thing happening Tried another main relay Ive tried 2 other iac solenoid , they tested both 9ohm And my old tested 9ohm too Ive tried 2 know good maf Tps is working fine, idle switch too. Ive tried another witch was working before I looked for ohm between ground and ecu ground and i do get 5ohm but the manual tell me 10 max. Ive tried back probing all ecu ground to the body to see if maybe i had a bad ground that my brand new snap on multimeter could not tell me without succes. One thing i noticed !!! While working today ive put the ground from my 12v led lamp to the ground to ecu that plug on the intake nornally ( now on body ) while it was not on the car but key on. The led lighted up but looked like would have 3volt on an hallogen bulb. Tried stock ecu, same story I just redone the whole grounding system with fresh wire and by the good way When i look At the wiring in the diagnostic book, the white and the black wire are going directly to the ecu And the 12v middle wire is coming from the ignition relay I did not try another valve body thought, but last time i cleaned it was this summer. Spin freely Ive tried another body yesterday same result I have cut each wire of the iac near the plug, when i disconect only the black wire, and touching the other end really fast, the car start to idle normaly and the code goes away, as soon i leave the wire togetter, it start to idle rought again Im out of idea someone need to Give me some input on this ! Thanks Link to comment Share on other sites More sharing options...
wtdash Posted November 21, 2015 Share Posted November 21, 2015 Hi, Welcome to the USMB. Is this a '94 WRX you imported to Canada? I'd also go Search on here: http://bbs.legacycentral.org/ The EJ22T used in the '91-'94 Legacy Turbo uses a very similar setup as your EJ20G..and 99% of the same wiring. and Go look on NASIOC.com and do a general search. The IAC you have is also common/similar to all the '92-'98/'99 Subarus. Sorry, I don't know what the issue is. TD Link to comment Share on other sites More sharing options...
Fel2 Posted November 21, 2015 Author Share Posted November 21, 2015 Thanks i already posted there without great result Ive find some of the best wiring diagram ever made for the obd1 ej20 era on this forum, from a guy who swap ej in westfalia Link to comment Share on other sites More sharing options...
Fel2 Posted November 21, 2015 Author Share Posted November 21, 2015 Also http://www.weidefamily.net/vanagon/Pending_Content/Engine_Conversion/02RemainingWiring/GOODSubaru2.2Lwiring_diag.pdf Link to comment Share on other sites More sharing options...
Fel2 Posted November 21, 2015 Author Share Posted November 21, 2015 Still looking for some help ! Thanks Link to comment Share on other sites More sharing options...
Fel2 Posted November 22, 2015 Author Share Posted November 22, 2015 Still havent found the trouble yet. When i generate a load on the signal wire it give me 6v on the white wire and 7v on the black wire witch suggest that the ecu is working corectly? Link to comment Share on other sites More sharing options...
Fel2 Posted December 9, 2015 Author Share Posted December 9, 2015 Bump Link to comment Share on other sites More sharing options...
Cougar Posted December 11, 2015 Share Posted December 11, 2015 You stated that you now have 12 volts on all 3 wires. That would mean that the ECU isn't making any connection to ground on the two wires. In post 6 you stated that you put a load on the signal wire and saw a slight difference in voltage. I'm not sure what you mean by signal wire. Are you taking about the 12 volt center wire? Link to comment Share on other sites More sharing options...
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