MIL flashing quickly fans cycling on off

Timothy Owner/Technician Owego, New York Posted   Latest   Edited  
Unsolved
Driveability
2012 Subaru Forester X 2.5L (FB25BA) 4-spd (TZ1B8)
No Codes
Runs Great Otherwise
Key On Engine Off

Hello, this Subaru sits in my bay with the above title happening currently,is this a default mode, can someone share insight,thank you

fans, ac clutch,fuel pump all cycle together(koeoff) MIL flashes quickly at idle,no code no misfire 

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Vince Technical Support Specialist
Commack, New York
Vince Default
 

Just a thought..... Make sure the "test" connectors are not jumped. Also if the fuse box under hood was replaced, make sure a fuse was NOT put in what was the test spot

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Timothy Owner/Technician
Owego, New York
Timothy Default
 

I will look, thank you

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Todd Technical Support Specialist
Roseville, Minnesota
Todd Default
 

"D Check" or "Output Cycling" is happening. Better question is where is Subaru hiding the connector. Delivery (TEST) Mode connector B75 and B76. [normaly unplugged] Bulkhead Wireing Harness (In compartment). 2 cavity (single wire) Green connectors. Near the passengers side fuse box, glove box area. Often they are connected together because... green, green, male, female, they look like…

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Timothy Owner/Technician
Owego, New York
Timothy Default
 

good info,thank you

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Zachary Mobile Technician
Austin, Texas
Zachary Default
 

Well I wrote a reply to this earlier but apparently I never submitted it. Basically exactly what others have already said. Look for those two connectors to be plugged in and if they aren't, see if the ECM side is shorted to ground as I believe that's what plugging them together does. Ground that pin of the ECM and put it in test mode.

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Timothy Owner/Technician
Owego, New York
Timothy Default
 

I am going back on this later today, this problem has gone away right now, I think the shorted ECM side is my next area to look into Thank You

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Michael Mobile Technician
Clinton, Utah
Michael Default
 

If there is a failed attempt to program the ECU it will do the same thing. Try resetting the ECUs in scan tool. If not an option go through each module read and record DTCs then clear codes. Sometimes a hard reset will work. Sometimes a fuse will blow when exchanging battery. There is a TSB on this.

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Timothy Owner/Technician
Owego, New York
Timothy Default
 

UPDATE, confirm D test pid shows on at time of condition(very random).The codes are P1518,P0851,P1152,P1153,P0140 every time incident occurs,Then it may not not repeat for several drive cycles​.​The codes reset to none after a few drive cycles. I did monitor P\N switch and check ed the adjustment I did see some chatter on Subaru forum about exact same event codes and all fixed at…

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