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  1. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    The FSM-specified AHC pressures are for the vehicle with no load, no passengers, no driver, no accessories, no fittings, fuel tanks full. The FSM is done this way because it allows the manufacturer to standardise the specifications. However, all our vehicles are different and nowadays many are...
  2. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    If new OEM AHC springs, then AHC pressures are function of the weight of the vehicle and the 'ride height' of the vehicle at the "N" height setting -- more weight than stock and/or more height than stock means more AHC pressure. If Rear AHC pressure is not sufficiently corrected by a spacers...
  3. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    Mmmm – exceeding 50 Amps seems like a LOT of current! AHC Pump overload? Possible but seems less likely as the cause of breaking the 50 Amp fuse-link. There are too many other protections which should operate first, as part of the AHC/TEMS systems as set out in the “DIAGNOSTIC” section of the...
  4. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    You have nailed it @TreatSmash :cheers: I just thought I would add a few pictures which may help anyone else who comes this way .... Picture credit: @Moridinbg ; Labels: @IndroCruise Picture credit: FSM; Labels: @IndroCruise FSM Extract: 'Globe' a.k.a. Gas...
  5. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    Suggest first clear the DTC’s so that you can be sure of which ones are current, not historical DTC’s from some previous condition, and then proceed from there. Your listing shows an unusual mix of DTC's and identities -- so suspect that clearing DTC's may resolve this confusion. There are...
  6. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    Excellent thread from 2018 -- THANK YOU @usedname and to originators @jLB, @goldigital, @PADDO , @theophilus , @Rubibu -- I wish I had found this years ago!!
  7. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    Mmmmmm -- I think I would suggest that all three Height Control Sensor circuits can be accessed via BI1 albeit the pathway passes via various other connectors along the way -- unless I am misreading the attached 2006 LC100 two-page EWD for AHC. I do have to agree that a coloured version of the...
  8. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    May I suggest also tagging @2001LC and @suprarx7nut and @Moridinbg -- -- and also inviting the wise insights of any other IH8MUD Members. Their wide experience also may be useful here …. @usedname -- For my part, I admire your work and persistence. You have gone much further than many...
  9. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    So @usedname, you now have the very welcome voice of considerable knowledge and experience from @uHu in Norway -- he has been a reliable guide to us all on AHC/TEMS matters and other issues for many years. A search on this forum for “height sensors” or just “sensors” and @uHu will reveal more...
  10. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    Good to see you getting involved in the detail!! In your pictures of a Sensor, the connector and the swing arm uniquely identify this as the Rear Height Control Sensor. As a starter and getting into even more detail, I notice in the second picture in your Post #397 the question with an arrow...
  11. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    I must offer an apology -- I recognise that I have dumped a HUGE download of information on you in a couple of my habitually very long posts with references and attachments, over just a few days. I have to confess that it has taken me about 5 years, not just a few days, to learn the AHC/TEMS...
  12. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    I have edited my long Post #391 in this thread to try and make the reasoning more clear .... I have read your reports carefully. It remains my strong opinion that it is EXTREMELY LIKELY that you have problems with at least one of the Height Control Sensors, or, at least one of the Height...
  13. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    *** Edited and updated for completeness *** Responding to your Posts #384 and #389 -- in my usual possibly excessive detail -- and including your concern that "...And most importantly, the difference in fender heights from before zeroing out and after matches the change in sensor height values...
  14. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    “I already had 19.5" for my front measurements” If this means that LH Front and RH Front are equal with engine “OFF” (no possible interference from AHC system), on a level surface such as a garage floor (not in the street -- well-engineered streets are graded and crowned to allow for rainwater...
  15. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    The “Vehicle Fitness Tester” or “Inspector” by whatever name in any country would be concerned about suspension damping -- without which there are well-known dangerous effects on stability and control of the vehicle when travelling as well as on braking and steering. So to that extent he is just...
  16. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    The attachment furthest below may be of interest -- see last page. However, on an AHC-equipped vehicle, the conventional wisdom is to ensure AHC pressures are within the FSM-specified ranges. Active Height Control (AHC) 'shock absorbers' really are just hydraulic struts. In the Toyota...
  17. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    I am guilty as charged @2001LC -- I have been 'channelling' information from posts by @PADDO which I picked up years ago, for example: Definitive list of AHC maintenance items - https://forum.ih8mud.com/threads/definitive-list-of-ahc-maintenance-items.604577/page-13#post-9855777 If what you...
  18. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    The answer to the first three questions is "YES". If the "Active Test" does not work when correctly performed, then it means that the vehicle is trying to tell you that something else is wrong -- in that case, suggest report back and we can try and figure out what is happening. By the way...
  19. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    You are probably across it all by now -- but the following notes were prepared and may as well be posted now for more happy reading ..... Keep calm and carry on!! A few things have been mixed up in the descriptions in your Post #362 and your Post #363 but no damage is done. You are just having...
  20. IndroCruise

    The ABCs of AHC - How to Measure, Flush, and Adjust all in one place

    See late edits added in original post #343
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