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Old 02-01-2008, 08:19 PM   #1
BallzToTheWallz
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Member#: 128949
Join Date: Oct 2006
Chapter/Region: NESIC
Location: Fairfield County, Connecticut
Vehicle:
2004 VF22 WRX hybrid
JBP 306 whp 366wtq

Default p1560 fix (backup circuit voltage low)

Hi guys i recently had a CEL on my car (2004 WRX) P1560. i did many searches on the internet to see how people went about fixing this code and found absolutely nothing but people who replaced there wiring harnesses and ECU's. SO im making this for future reference so if anybody wants to know how to fix it.

when i first did the diagnostic i tested the main relay (located under the passenger side door sill under the glove box) to make sure it had power and found that it did on all the circuits it was supposed to. The i went and found that one of the circuits was low. The circuit i found was low is a circuit that comes right off the main fuse (SBF5 under the hood fuse box). This circuit runs directly to the fuel pump relay which is located right next to the main relay. this circuit has a splice that runs off of it which divides into 2 circuits. one runs to the main relay and the other to the data link connector. I tested the voltage of the main fuse SBF5 and it tested at 12 volts constant power. then i tested the connection at the circuit that runs off the main fuse to the fuel pump relay and found that it too tested at 12 volts. so i went and started testing the circuits off the main relay and found that the one spliced off the circuit to the main relay only tested at 6 volts. which really didnt make much sense because i was expecting it to have 12 volts or no power at all. I looked it up and found that the circuit is supposed to run at 12 volts. i then tested the circuit to the data link connector and found that it to tested at only 6 volts. I then knew what i had to do. I connected he circuit to the fuel pump relay to the one running to the main fuse and walla. i then cleared the code and it never came back.

If you have any questions or need the diagrams send me a pm. I work at a shop and have mitchell on demand so i will be more then happy to help you out with this.

I hope this is of some use for most of you who come up with this code if any of you do at all.
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Old 11-30-2015, 05:52 PM   #2
Greg555
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Member#: 814
Join Date: Jan 2000
Chapter/Region: MWSOC
Location: Chicago, il USA
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Want engine mgmnt?
I sell ViPec's ECU's

Default

I have this code and need help. Can u be more specific please?
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Old 12-12-2015, 10:31 AM   #3
EntertheWagon
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Join Date: Nov 2007
Chapter/Region: Tri-State
Location: Central Jersey
Vehicle:
04 War Wagon
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Default

Check for 12 volts at the ECU connector B137 pin 10 it should be a brown wire. If you have no power you can check the SBF-5 fusible link in the underhood fuse box. Running a wire from that pin to a circuit that it is hot at all times, like the radio, should fix your problem if you are losing battery voltage somewhere along the harness as was described above. Hope that helps if you haven't fixed it already.
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Old 12-12-2015, 04:43 PM   #4
Greg555
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Member#: 814
Join Date: Jan 2000
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Location: Chicago, il USA
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Want engine mgmnt?
I sell ViPec's ECU's

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I was a coroded pin inside ecu on mine
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Old 06-26-2016, 11:16 PM   #5
x digger x
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Join Date: Jun 2016
Default Bump from the dead, but same issue

I have an 09wrx that does the same thing, only mine only happens when it is moist outside. Looking at the ecu end of the equation I have 12v, but then I am lost as to where connections are made on my MY WRX. I have all data at my shop and am obviously missing something here. When the code is set, I have no DLC power, or partial as my AP won't function without outside power being applied (apv2 w/ Ian to laptop). Another strange (possibly not related but seems to be) is that my car is hard to start after this code is set, my thoughts are that it has no 'learned' data and has to relearn everything. Does your system show anything about this from MY 09? Thanks, and apologies in advance for bumping a dead thread, it really is the only one on the Internet with valid troubleshooting steps and help, thanks!
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Old 06-29-2016, 06:58 PM   #6
x digger x
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Default

FIXED.

Jump the constant 12v+ power from your stereo to B135 pin 5

Problem solved.
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