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Changed ac compressor. Now have codes

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Seth.t, Jul 6, 2020.

  1. Seth.t

    Seth.t New Member

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    So I changed my ac compressor and recharged the system. I used the hybrid ac system oil from auto zone and disconnected the 12v battery and the service grip plug as specified in the manual. Everything worked great, drove it 40 mins home from a friends house and then got the red triangle on the dash.

    I used the mini vci to get the codes:
    Hybrid control 526

    P0AA6 hybrid battery voltage system isolation fault

    B1421 solar sensor circuit (passenger side)

    C1310 HV system malfunction

    My thoughts were originally that I didnt get the service grip plug installed correctly, but I've taken it out and put it in multiple times to no avail. Or I've done something at the ac compressor, but every is tightened down and the ac still works once I disconnect the 12v battery and reset the car.

    Once I reset the car by disconnecting the battery and reconnecting, I can drive it about a half mile before it trips the codes.

    I've had this car for 4 years and it has high miles. I'm used to working on 70s fords mostly.

    The hybrid battery was replaced last year with a rebuilt one from a service.

    Any help would be greatly appreciated as it seems I'm in over my head. Thanks in advance.
     
    #1 Seth.t, Jul 6, 2020
  2. edthefox5

    edthefox5 Senior Member

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    You used the wrong ac oil. Should be nd11 whatever you used is conducting and thats where that ground fault is coming from.

    You may have damaged the new ac compressor aLso.

    Disconnect the the high voltage power leads to the ac compressor after removing orange safety plug. Tape up the power leads then disconnect the 12 bolt battery to reset the car and clear the codes and pray the red triangle does not reappear.

    Till you do that By disconnecting the battery it will clear that ground fault for a while till the system detects a ground fault again. Stop driving the car until you disconnect that compressor. reports of battery explosions when that is continuously done.
     
    #2 edthefox5, Jul 7, 2020
  3. Seth.t

    Seth.t New Member

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    I used AC pro hybrid oil. It says on the bottle that its compatible with ND-11. And I had searched here before and that's what others had suggested using. The rebuilt compressor did have some yellowish oil in it that I drained.
    [​IMG]

    If that brand of oil isnt compatible, then that would be some useful information for others here in the future.
     
    #3 Seth.t, Jul 7, 2020
  4. maximusdec

    maximusdec Member

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    Yikes...I bought the same oil from AutoZone yesterday and planned to use it. Did you happen to use their rental AC gauge or a contaminated AC gauge?

    What's the remedy here if it's the oil causing this issue? Complete AC overhaul?
     
    #4 maximusdec, Jul 7, 2020
  5. Seth.t

    Seth.t New Member

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    I used a friends ac gauge set. Must have been contaminated?
     
    #5 Seth.t, Jul 7, 2020
  6. ChapmanF

    ChapmanF Senior Member

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    That's the first stage of the system reporting an isolation fault.

    After shutting the car down with a P0AA6-526 and not clearing anything, when restarted the car should automatically perform further checks and log a 611, 612, 613, or 614 alongside the 526.

    Ed is betting that'll be a 611, which is a sensible bet given the recent repair history, but it also wouldn't hurt to find out.

    If that's what it is, and caught quickly enough, there has been an article that reported apparent success after doing a thorough system flush using a HECAT H-1000 flush machine, followed by installing a new compressor. 49,000 miles after those interventions, everything still seemed to be ok.
     
    #6 ChapmanF, Jul 7, 2020
    Last edited: Jul 7, 2020
  7. Seth.t

    Seth.t New Member

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    Oh ok, so I need to shut it down and restart after it trips the codes. Will do and report back.

    611 it is.
     
    #7 Seth.t, Jul 7, 2020
    Last edited by a moderator: Jul 7, 2020
  8. Seth.t

    Seth.t New Member

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    This is what happens when a novice tries to repair a Prius...

    So if I disconnect the cable to the compressor could I theoretically drive it that way?
     
    #8 Seth.t, Jul 7, 2020
  9. maximusdec

    maximusdec Member

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    That's good to hear. Do you happen to know the color of the ND11 oil? The used compressor I bought from the salvage yard has a yellowish liquid.

    I would assume you should be okay if you don't use the AC
     
    #9 maximusdec, Jul 8, 2020
  10. Seth.t

    Seth.t New Member

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    I had been driving it short distances without the ac and it hasn't tripped the red triangle yet. But I stopped driving it yesterday.
     
    #10 Seth.t, Jul 8, 2020
  11. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Did you weigh the refrigerant charge that you put into the system. Due to the current design of auto AC systems, there is a very narrow margin between a full charge and the system being overcharged.
     
    #11 Georgina Rudkus, Jul 8, 2020
  12. Seth.t

    Seth.t New Member

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    Yes, we did weigh the refrigerant.
     
    #12 Seth.t, Jul 8, 2020
  13. ChapmanF

    ChapmanF Senior Member

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    Do you know of some way for a refrigerant overcharge to cause a high-voltage isolation fault?
     
    #13 ChapmanF, Jul 8, 2020
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