P0560 troubleshooting

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by cincy14, Sep 20, 2025 at 9:43 PM.

  1. cincy14

    cincy14 Junior Member

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    2006 Prius
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    I have code P0560 that I’m not sure how to proceed with. I’ve seen a couple other threads that mention checking the engine ecu / ecm. The ecu fuse is good and I have 13-14 volts at the fuse terminal. Once I figured out where the ecm e7-6 pin was, I’m only getting 0.2 volts there but it is difficult to get a good connection with my multimeter. I did measure 13-14 volts on pin e7-5. While I was behind the glove box I checked the cabin filter and found a mouse nest that’s probably been there a while since I haven’t checked it in a couple years. Where should I check for wire damage causing the low voltage? I don’t see any damage from mice behind the glove box.
    I also found the diagnostic instructions for this code that say to check the HV fuse and the battery ecu. The HV fuse is good and I have 13-14 volts at the fuse terminal but I have not dived into the battery ecu yet. Could a battery ecu problem cause the ecm low voltage?
    Any help is much appreciated. The car does drive normal.
     
    #1 cincy14, Sep 20, 2025 at 9:43 PM
  2. mr_guy_mann

    mr_guy_mann Senior Member

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    So, you should google "how to backprobe a connector". This can show how to get a good voltage reading without damaging the terminal.

    If you do not have 12V "battery voltage" at the red wire for E7-6, then you have an open circuit somewhere. You need to physically inspect the wire harness from the ECM back through the firewall, to the engine fusebox.

    The wiring diagram shows a single wire from connector 3I-5 all the way to the ECM. 3I is on the bottom of "unit B" inside the engine fuse box.

    If you have confirmed power at both legs of EFI fuse, then I would check for 12V at 3I-5.

    Sometimes I consider running a new - separate wire (called an overlay) to bypass a faulty circuit, but I usually want to find the point of failure. There could be damage to other wires as well.


    Posted via the PriusChat mobile app.
     
    #2 mr_guy_mann, Sep 22, 2025 at 1:09 PM
  3. mr_guy_mann

    mr_guy_mann Senior Member

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    #3 mr_guy_mann, Sep 22, 2025 at 1:10 PM
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