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recently i took a trip to six flags had a great time until i was on my way home and started overheating some quick checks got me to where i learned the cooling fans were not coming on at all. i wound up jumping power from the battery to the main fan to get it running so i could get home. now ive gone throgh and found a broken ground on the main fan repaired that the main fan runs now. the 2nd fan a/c fan still wont run. it had a broken power feed for one of the 2 speeds i repaired and the fan still wont come on. the car is a 1998 subaru outback ive been testing the fans by plugging in the green diagnostic connector under the dash witch is supposed to cycle both fans low high off repeatedly and is doing that with the drivers fan but not the passenger fan. i have tried swapping all the relays around and i cannot locate any blown fuses in the engine or interior fuse boxes. where should i start looking next?
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did some more checks i jumped power into the fan and the fan does spin up. i have been looking at it backwards its the a/c fan that is running and the main fan is not coming on. i found another relay for the main fan above the under dash fuse box and swapped it with its known working friend the rear defroster and still have no main fan running. im pretty sure the relays are all good as they will all turn on the a/c fan. what is the chances the ecu could be bad? the wiring diagram i have shows there controlled by the ecm. im fairly capable of electrical work but not so great at diagnosing it.
Here is a diagram, I believe it should apply to your vehicle.
This should give you a starting point.
that diagram looks nothing like the one i have in the haynes repair manual. witch one should i follow? i can say the one in the manual i have makes sense to whats in my car.
this is the diagram i have
[URL=http://s163.photobucket.com/user/estatesbburnin/media/20170510_132333_zpsi364qnso.jpg.html][IMG]http://i163.photobucket.com/albums/t290/estatesbburnin/20170510_132333_zpsi364qnso.jpg[/IMG][/URL]
If you feel it is a better match… by all means use it.
Short of having the FSM, it’s always a crap shoot when it comes to after market wiring diagrams.M
yet more updates. i had some help today and learned the switched side of the relays powers are all good i can bypass every relay and get the fans to come on. i also learned the relay in the drivers foot ares is the main fans relay if i jumper this relay through i get my main fan to come on and it also makes the missing power i had in the engine compartment relay be there. i believe my issue lies before the main fan relay inside the car witch im assuming is going right from that relay over to the ecu. how likely is it the ecu could be bad? anyone from the ct area willing to allow me to try their ecu?
well the local junkyards dont have any of my car so i turned to ebay. im reading now that if i replace the ecm ill have to have it reflashed will i need to do this considering i would be replacing the ecm with the exact same part numbered ecm? its a 1998 outback and has no security stuff in it.
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