xbeerd Posted August 17, 2011 Share Posted August 17, 2011 ok, so i have my radiator fan wired into a relay, i'll use a generic relay to illustrate my setup.... pin30 - 12v+ pin85 - 12v+ pin86 - ground pin87 - 12 volts to power fan. fan connector power from pin87, then to ground. I want the ecu to turn on the fan, would i not just connect the b134-pin3 (red/blue stripe) to the ground of the coil? OR would i connect the red/blue wire to the pin85 coil power and connect 86 to ground? OR... am i misunderstanding the function of the Radiator Fan 1 control wire. i assumed it turned the fan on at a certain temp? Thanks in advance! -scott Quote Link to comment Share on other sites More sharing options...
Turbone Posted August 18, 2011 Share Posted August 18, 2011 EJ or EA engine/ECU? Quote Link to comment Share on other sites More sharing options...
xbeerd Posted August 18, 2011 Author Share Posted August 18, 2011 (edited) oh you guys and your details... LOL. its a EJ25 engine and ecu out of a 2000 Outback. OR i was thinking, couldnt i just run the ground wire from the coil thru the thermoswitch in the EA radiator? (*i assume thats the thermoswitch on the passenger side of the radiator?) that way when the coolant is hot.. the fan comes on. (duh) Edited August 18, 2011 by xbeerd Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted August 18, 2011 Share Posted August 18, 2011 The wire's from the ECU are ground signals for the relay driver coil. On your schematic there it would replace the ground wire going to pin86. GD Quote Link to comment Share on other sites More sharing options...
xbeerd Posted August 19, 2011 Author Share Posted August 19, 2011 The wire's from the ECU are ground signals for the relay driver coil. On your schematic there it would replace the ground wire going to pin86. GD ok, thats what i did originally. maybe the engine just didnt get hot enough to turn the fan on then. do you know what temp its gotta be to turn it on? i been warming it up till the thermostat opens, which seems to be around 185degrees (give or take) and then it stays around there. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted August 19, 2011 Share Posted August 19, 2011 My experience - the ECU trips the fan on at around 195 to 200 degree's as registered on my digital laser temp gun. GD Quote Link to comment Share on other sites More sharing options...
xbeerd Posted August 19, 2011 Author Share Posted August 19, 2011 ok, i guess it just didnt get hot enough then. i'll have to take er for a spin i guess. now on the issue of this diode on the wire. do you have a general diagram or anything on how to wire it in? (from the other thread on the pot to set the engine temp gauge) i guess i just dont see how the ecu is going to see any backfeed on my circuit as it shouldnt see any other voltage besides when it activates the coil. maybe im just missing something? Quote Link to comment Share on other sites More sharing options...
xbeerd Posted August 20, 2011 Author Share Posted August 20, 2011 i drove the car a bit today, fan came on like it should, i do think i wanna get a second fan hooked up to the thermoswitch, maybe just a 10" i can just use the existing wiring from the old fan and not have to do anything else right? So with the 220ohm resistor i put in with the temp gauge wiring. this is where my needle sits about when the fan kicks on. would you say this is good and i shouldnt bother trying to dial it in. as in any idea where it would have to get on the gauge when catestrophic failure would occur? (just based on the needle position?) Quote Link to comment Share on other sites More sharing options...
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