ahc low light

Philip amos Dec 28, 2019

  1. Philip amos

    Philip amos Member Supporter I am in uk

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    i had a burst pipe replaced and rear springs ,the globe pressures ok.However the other day with six people aboard the low light came on when all had alighted the vehicle all was well again .When the garage blead the system they didnt use as much fluid as expexted , could air in the system cause this,the ride is fine
    ive been driving around for a few days now and all is fine (unladen)
     
  2. hodgy0_2

    hodgy0_2 New Member

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    Mine does this, when i have over 6 adults in, i was told it is normal a "false low" reading
     
  3. Philip amos

    Philip amos Member Supporter I am in uk

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    Ok thanks
     
  4. jibberjabber

    jibberjabber Well-Known Member I am in england

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    Hi,

    I don't know who gave you this info, but theres no such thing as a 'False Low' the AHC cannot give a false low, low is low, if you understand how the AHC system works then you will know why there can't be a false low.

    If your AHC is going into 'low' without you putting the there, then there is something else wrong, the system is designed to carry 7 adults, and should stay in 'N'

    Good Luck.
     
  5. Philip amos

    Philip amos Member Supporter I am in uk

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  6. Philip amos

    Philip amos Member Supporter I am in uk

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    I think it’s pump or pressure valve as it’s gone to low now and flashing off code c1762 pressure on techstream
     
  7. jibberjabber

    jibberjabber Well-Known Member I am in england

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    In my humble opinion, I think you may have air in the system.

    Check out AHC C1762 on mud.
     
  8. jibberjabber

    jibberjabber Well-Known Member I am in england

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    Have a look at this, it may help.
     

    Attached Files:

  9. Philip amos

    Philip amos Member Supporter I am in uk

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    Would air cause pump to have pressure problems
     
  10. jibberjabber

    jibberjabber Well-Known Member I am in england

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    Sounds like it
     
  11. Philip amos

    Philip amos Member Supporter I am in uk

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    So if you can’t raise suspension how can u bleed
     
  12. jibberjabber

    jibberjabber Well-Known Member I am in england

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    Have a look at my posts 7 & 8 on this thread.
     
  13. Philip amos

    Philip amos Member Supporter I am in uk

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    What’s sst. Dl3
     
  14. jibberjabber

    jibberjabber Well-Known Member I am in england

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    It’s a special service tool = SST
     
  15. Philip amos

    Philip amos Member Supporter I am in uk

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    So that test is out
     
  16. Trevor

    Trevor Well-Known Member Supporter I am in england

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    You can use a paperclip instead of the SST. You are shorting out 2 contacts (Ts and CG) in the DL3 connector.
     
  17. jibberjabber

    jibberjabber Well-Known Member I am in england

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    No, just find out what sst dl3 is, it might be techstream
     
  18. jibberjabber

    jibberjabber Well-Known Member I am in england

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    There you go, a more knowledgeable member than me has jumped in.

    Good luck.
     
  19. hodgy0_2

    hodgy0_2 New Member

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    Hi

    I was told this when I had my torque converter replaced by Overland Cruisers a few years ago

    my car has always read low when I have had 7 people in - it does not seem to physically go into the low height setting, the car still sits at the normal (to the Mk1 eyeball) height and drive normally,

    and as soon as the 7 person gets out the dash light reads normal

    but happy to be corrected, maybe height sensor is off

    in fact I will bleed the system anyway - I have not done it for a while
     
    Last edited: Jan 14, 2020 at 10:45 AM
  20. jibberjabber

    jibberjabber Well-Known Member I am in england

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    It's not just a case of eye ball and changing the fluid, it's also a case of rear springs, torsion bars, ACCUMULATORs front and rear, AHC fluid, hight sensors, hydraulic rams, and other thing I can't think of at the moment, if you wan't to know why your Active Hight Control goes into 'Low' when you have 6 or 7 people in you car then ask someone who knows a lot about the subject, uHu or Paddo just to think of two off the top of my head.

    But I can tell you there is no such thing as a 'flase low' and with all due respect to Overland Cruisers who are far more knowledgeable when it comes to 4x4's than I am, but I would ask the question, are they experts on how Toyota Active Height Control functions, and experts on the service and maintenance or Toyota AHC.

    Toyota AHC is a service item just like any other suspension, and just like any other suspension if maintained well it will last the life of the car, but unfortunately there are not many people who understand how it works, and that includes Toyota mechanics at Toyota dealerships.

    I am no expert on AHC by a long shot, but I do know that AHC will only go into 'L' or 'H' if you put it there, default is 'N' for normal, if it goes into 'L' or 'H' it's self then there is something wrong, or at least the warning of the start of something going wrong.

    Just think, Toyota designed the 100 to seat 7, if the AHC kept going into 'low' when they were first sold there would have been thousands if not hundreds of thousands of complaints.

    Hope this helps, good luck.
     
    Last edited: Jan 14, 2020 at 12:42 PM
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