idosubaru Posted July 16, 2011 Share Posted July 16, 2011 (edited) XT6. Same basic set up as an EA82 though. Fan comes on when jumpered at relay - so fan and wiring there good. Swapped relays and switch in radiator and still won't come on. The FSM doesn't have pinouts for wiring so not quite sure how to test switch/relay/wiring for continuity/ground, etc. Edited July 17, 2011 by grossgary Link to comment Share on other sites More sharing options...
MilesFox Posted July 16, 2011 Share Posted July 16, 2011 how about the thermoswitch on the radiatpr? if you jumper the terminals and the fan runs, the thermoswitch is bad. you can just wire a switch into that terminal, or just jumper them, but the fan will be on with the key at all times Link to comment Share on other sites More sharing options...
idosubaru Posted July 16, 2011 Author Share Posted July 16, 2011 (edited) miles - i jumpered that connector and nothing happens. (thermoswitch is fine) if i knew which wire was supposed to provide 12 volts to the thermoswitch circuit i can fix this. but the FSM is missing info on this wiring. both thermoswitch wires and both relay connectors are all ground. doesn't one need to be +12 to power the circuit? they can't all be grounds? but - the thermoswitch wires - one shows 12 volts, the other shows 6 volts - something is clearly wrong there. Edited July 16, 2011 by grossgary Link to comment Share on other sites More sharing options...
Loyale 2.7 Turbo Posted July 16, 2011 Share Posted July 16, 2011 ... they can't all be grounds? ... I Believe Yes, 'cos those Grounds send the Switchin' Signal to the Relays. I Believe that there could be a Worn Relay... Have you tried to use other Known-Good Relay? ... Also there could be a Short-Circuit Wire. I Kindly Suggest to Start by Switching Relays... Good Luck! Kind Regards. Link to comment Share on other sites More sharing options...
idosubaru Posted July 16, 2011 Author Share Posted July 16, 2011 I Kindly Suggest to Start by Switching Relays...already did that numerous times. no change. i can ground or power (forget which) one of the relay terminals and the relay clicks and the fan comes on, so the relay is working, it's just not getting properly energized by the thermoswitch. what's awesome is the Subaru FSM doesn't have a wiring diagram at all for the *main* fan - or i didn't find it anywhere that it seems it should be located anyway. all sorts of other obscure needless info but nothing about the main engine cooling fan, that's awesome! Link to comment Share on other sites More sharing options...
T'subaru Posted July 17, 2011 Share Posted July 17, 2011 (edited) ecu terminal #9 Wb per '90 fsm ea82 series, looks like they are grounded and get 12v to energize plug E9, section 2.7 page 49 88 xt6 fsm, looks like they are the same xt6 to ea82 pin out wise and plug numbers. I hope this helps Gary Edited July 17, 2011 by T'subaru Link to comment Share on other sites More sharing options...
idosubaru Posted July 17, 2011 Author Share Posted July 17, 2011 ecu terminal #9 Wb per '90 fsm ea82 series' date=' looks like they are grounded and get 12v to energizeplug E9, section 2.7 page 49 88 xt6 fsm, looks like they are the same xt6 to ea82 pin out wise and plug numbers. I hope this helps Gary[/quote'] thanks a bunch for looking that up. i think you're looking at the engine temp sensor though, right? the one in the intake manifold. this one is just a switch and not used by the ECU - it's just for the relays/fans i think? Link to comment Share on other sites More sharing options...
Numbchux Posted July 17, 2011 Share Posted July 17, 2011 (edited) The radiator fans are included in the overall wiring diagrams of the FSM. page 143 on my '88 FSM, grid location B-2 (same on the '88 FSM that's available online) Also, the radiator fan system is pretty different between an XT6 and standard EA82 (not sure about EA82-XT....). The radiator thermo switch actually controls the relay in the XT6, whereas the standard EA82s just put it inline with the ground side of the fan (not to mention, EA82s only had one electric fan). Edited July 17, 2011 by Numbchux Link to comment Share on other sites More sharing options...
Cougar Posted July 17, 2011 Share Posted July 17, 2011 If the thermoswitch is supposed to make a ground connection for the relay coil and you say there is 6 volts on one side of the switch connections then the connection to ground for that wire has a bad connection to ground. Try grounding the wire side of the thermoswitch that has the 6 volts along with jumpering the switch connection to see if the fan turns on then. If it does then you have confirmed there is a bad connection to ground Link to comment Share on other sites More sharing options...
idosubaru Posted July 17, 2011 Author Share Posted July 17, 2011 (edited) If the thermoswitch is supposed to make a ground connection for the relay coil and you say there is 6 volts on one side of the switch connections then the connection to ground for that wire has a bad connection to ground. Try grounding the wire side of the thermoswitch that has the 6 volts along with jumpering the switch connection to see if the fan turns on then. If it does then you have confirmed there is a bad connection to groundexcellent call, i'm going to try that today. if it doesn't work i'm wiring in my own connector and wiring. the alternator connector fits great on the thermoswitch and i have some new ones so i'll use that to create my own wiring from the switch to the relay. i found that +12 volts at one of the relay terminals would turn the fan on. no grounds will turn it on - i supposed because the relay isn't getting tripped to supply the 12 volts? The radiator fans are included in the overall wiring diagrams of the FSM. page 143 on my '88 FSM, grid location B-2I found that one, but it's generic and gives no pinout/wire color information. don't even know if it showed the relay/thermoswitch - just the fans. Also, the radiator fan system is pretty different between an XT6 and standard EA82 thanks! a 3 second cursory glance under the hood of my 87.5 XT Turbo suggested they were the same, but maybe not or it's only XT's. Edited July 17, 2011 by grossgary Link to comment Share on other sites More sharing options...
idosubaru Posted July 17, 2011 Author Share Posted July 17, 2011 Try grounding the wire side of the thermoswitch that has the 6 volts along with jumpering the switch connection to see if the fan turns on then. If it does then you have confirmed there is a bad connection to groundi did that this morning and nothing happened, fans wouldn't come on. funny thing i tried jumpering that "6 volt" wire to positive instead of ground - obviously a bad idea as it short circuited, sparked, heated up quick - but the FANS CAME ON. that's awesome. i guess something is wrong with the circuit from the thermoswitch to the relay? maybe that "6 volt" wire is the one that goes to the relay somewhere? unfortunately this multimeter doesn't have a continuity setting for me to isolate which relay terminal is connected to the thermoswitch. Link to comment Share on other sites More sharing options...
idosubaru Posted July 17, 2011 Author Share Posted July 17, 2011 Fixed: When two terminals on the relay were jumpered the fans run. So I wired the two thermoswitch wires right into those wires at the relay. So the thermoswitch completes the circuit when it gets to temp. No need for a fuse since that circuit is already fused and no need for a switch as the thermoswitch is still cycling it on and off. I used a new alternator plug since it fit nicely on the thermoswitch. Works fine now. Only took 30 minutes, I'm just slow with electrical stuff and without any details in the FSM I was learning as I went. Thanks for the help all, electrical is not my thing. Link to comment Share on other sites More sharing options...
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