ahc low light

Philip amos Dec 28, 2019

  1. jibberjabber

    jibberjabber Well-Known Member I am in england

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    This also might be worth a read, even though it for a Lexus 470 the AHC is identical to a Land Crusier 100, as the are basically the same vehicle. Happy reading.

    Here is an artical from IH8MUD posted way back in Oct 2013, entilted


    LX AHC Off Road Suitability.

    Credit to TeCKis300

    AHC gets a bad rap from most on these boards. While some of it is deserving, as it's a potentially expensive wear item to maintain and repair, most of the other reasons are largely undeserving as it's a robust and capable system that is meant to increase the capability breadth of the vehicle without compromises. That is, it will do very well for on road manners, yet also provide clearance, articulation, and active dampening when the going gets rough.

    I can't find it at the moment, but Toyota had a diagram that compared the capability of AHC vs non-AHC equipped hundy. It basically showed the AHC vehicle having more capability and on and off road. Now you can't have everything and eat your cake too, as the obvious trade-off is increase cost and complexity. Which brings me to my main point.

    Half of the negativity against the system is due to second hand owners unwilling to cough up to maintain and repair what is ultimately a wear item. Not that it's not durable as there are plenty of anecdotal stories about it lasting over 200k. The other half is due to second hand owners trying to modify the system, or use it outside of its carrying capability, without truly understanding how to modify it to do whatever they are doing. Then they blame any fault on some contrived incapability or unreliability of the system.

    Fact is, it's a tremendously capable system that can allow you to have the best of both on road and off road qualities (unlike an off road oriented suspension which biases the truck). I'll list a few.

    1) By it's very nature of having a large fluid volume, it has more thermal capacity than any remote reservoir setup - great for those washboards.

    2) The suspension is ACTIVE, so it has the ability to automatically dial in the right dampening for any particular wash board and load.

    3) AHC will RTI higher (toyota supported fact) due to its smaller anti-roll bars and active height control.

    4) AHC is constant height, regardless of load within its rated capacity. For example, if you toss in 4 people and gear on a standard non-AHC hundy, you'll already begin at a lower ride height relative to the AHC equipped hundy. Nevermind that the AHC can lift on demand.

    5) AHC can have more lift than a statically lifted (stock non-AHC shocked) hundy on demand. Because the non-AHC truck has to compromise to leave some droop in it's setup. The AHC can go even beyond its on demand high position, when the ECU detects the need.


    Sorry for my long winded reply, but I hate watching the herd mentality (eg. above) bash AHC on these boards , without a substantive reply.
     
  2. Philip amos

    Philip amos Member Supporter I am in uk

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    Next question where is dl3 connector, is it what techstream plugs into
     
  3. Philip amos

    Philip amos Member Supporter I am in uk

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    i tend to think you are right about air ,bear in mi9nd my car lost all fluid in a pie failure a couple of months ago.i just need to raise car to bleed
     
  4. Trevor

    Trevor Well-Known Member Supporter I am in england

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    There is a data plug high up alongside the brake pedal, use a torch as it's black and easy to miss. This is where you plug in the techstream plug. The DL3 connector is under the bonnet, a small rectangular thing with a curved top, near the bulkhead on the passenger side, flip open the curved top and the pins are underneath, the pins are labelled on the inside of the curved top.
     
    jibberjabber likes this.
  5. jibberjabber

    jibberjabber Well-Known Member I am in england

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    You are looking for DLC3 NOT DL3, as Trevor rightly says DL3 is under the bonnet, DLC3 is the plug near the brake pedal, the same one where you would plug teachstream into, I bought an extension lead from eBay for my DLC3 also known as OBD 2 port, it makes life a lot easier, no contortioning under the dash, then just follow the instructions on the extract from the FSM I posted. :)

    Hey presto.
     
  6. jibberjabber

    jibberjabber Well-Known Member I am in england

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    Have you read AHC C1762 on mud ?
     
    Last edited: Jan 14, 2020
  7. jibberjabber

    jibberjabber Well-Known Member I am in england

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    PREPARATION, a) Using SST, (as stated by Trevor, a 'paper clip') connect the terminal Ts to CG of DLC3.
     
  8. Philip amos

    Philip amos Member Supporter I am in uk

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    I’ve just tested motor it squeaks and doesn’t want to run. I’ve tested another motor I have it runs fine so I’m hoping this is the problem and will change next week
     
  9. jibberjabber

    jibberjabber Well-Known Member I am in england

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    Good Luck :) let us know how you get on.
     
    Last edited: Jan 15, 2020
  10. Philip amos

    Philip amos Member Supporter I am in uk

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    thanks
     
  11. Philip amos

    Philip amos Member Supporter I am in uk

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    ive removed old unit and rain stopped play.However i thought i would try motor on the bench it ran and no squeel ? so im hoping its still the pump not working under pressure ie pump not motor
     
  12. Philip amos

    Philip amos Member Supporter I am in uk

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    yes i have
     
  13. Philip amos

    Philip amos Member Supporter I am in uk

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    Well changed th pump and am still getting code c1762. any ideas,ihavent shorted pins ts to cg yet on the connection in footwell yet.any ideas
     
  14. Philip amos

    Philip amos Member Supporter I am in uk

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    also fuse had blown
     
  15. jibberjabber

    jibberjabber Well-Known Member I am in england

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    Are you reading all 4 pages from the FSM extract I sent you ? if so do you understand them ? if so page 2 tell you how to raise the car.
     
  16. Philip amos

    Philip amos Member Supporter I am in uk

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    thats tomorrow
    its above brake pedal yes
     
  17. Philip amos

    Philip amos Member Supporter I am in uk

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    also will look for other 2 ahc fuses in footwel
     
  18. jibberjabber

    jibberjabber Well-Known Member I am in england

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    Yep, that's the one.

    IMG_0498.jpeg
     
  19. Philip amos

    Philip amos Member Supporter I am in uk

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    well i triedshorting terminals and it wouldnt do anything so i got a bit suspicious and went to test pump again and i found i hadnt pust terminal on fully .All working so my diagnisis was right its the pump that failed motor ok.im lucky i had 2 full pumps motors and tank that i bought for£150,so cheap repair .My next job will be to re bleed hole system but im going to malaysia in 2 weeks so will do on my return.
    Thanks for all the help and at least no i can pass on my practical experiences to anyone that needs it
     
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