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  1. uHu

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

    @john100 Definitely get new rear springs. Get 48231-6A780 (Brown paint spot), if you are not carrying a lot of permanent extra weight. They are slightly stronger than the standard purple spot. Toyota 48231-6A780 (482316A780) SPRING, COIL, REAR - https://www.amayama.com/en/part/toyota/482316a780...
  2. uHu

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

    Hmmm - What can the reason be.... Could one of the level valves be stuck and not closing properly, so that the pump has to run continuously to keep the car up? Do both front and rear drop? Does the pump run for a long time when you put in a new fuse? It's supposed to tun only until the car is at...
  3. uHu

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

    That would be the 50 A AHC main fuse in the engine room fuse box. The fusible links generally protect the main wires/components from starting a fire in case of a short circuit. The 50 A AHC fuse is for protecting the wiring, AHC relay and AHC motor in case of a short. I would examine those three...
  4. uHu

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

    I would either lift the body or splice in a new cable bunch around the inside of the spring bucket. Anyhow, waiting to see your way out of the bog - it seems that all the solutions you end up with are good. I will have to do something similar, as currently I have one broken connection between...
  5. uHu

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

    Trying new ideas here - maybe it's been checked out, but: If there is a problem with a gate valve, you could get a symptom like yours, usedname. The gate valves have to be open in order to get both left and right side to do it's part of a height change. The level valve is between the pump and...
  6. uHu

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

    Reading this thread again for a bit - there's a lot going on I see. Looks like you are on the right track, usedname. Regarding your worry about the voltage at the areas at the ends of the travel of the sensors: There is no need to worry. What happens to the voltage (or resistance) at the ends...
  7. uHu

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

    1 - Yes, the left one. 2 - It could be that the left coil is more weakened than the right one. If you change the coils, and get a stronger one on the left, it could be that you don't need indexing. Of standard OEM coils, you have pink, purple and brown to choose between. To me, only the brown...
  8. uHu

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

    That's a downgrading. More rim means less rubber. Less rubber means less offroad-worthy.
  9. uHu

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

    Something is not working with your TechStream or with the AHC. Which Trouble Code do you have? (Your TechStrem page says there is one) Does it move from Lo to N? And still no movement in the pressure readings? Do the height sensor numbers change when you go from Lo to N? What about actual...
  10. uHu

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

    You have a bit lot of reading to do. There's plenty in this thread and others. It would be faster if you could hook up with an experienced ahc mudder, and get a hands-on run-through.
  11. uHu

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

    Could be air, but it is also dependent on how you park - any binding in the transmission gives lateral forces in the suspension part, which make them harder to move.
  12. uHu

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

    Yes. I'm in the same situation and have lowered the rear by 1/2" in order to have a bit higher load carrying capacity. It takes about one minute to adjust the sensor by sliding the link a few mm down the slot.
  13. uHu

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

    Height sensor reading of - 2mm is as good as zero. AHC height adjustments will attempt getting the sensor to zero, and will stop within + - 5mm, normally. If your rear height is at spec, and the pressure too high, you actually have to change the coil springs to get the pressure within specs...
  14. uHu

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

    Yes, right. The other thing that happens when cranking both TBs is that more of the weight is carried by the TBs, and less by the ahc/globes. I.e. the pressure goes down.
  15. uHu

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

    Looks like you are OK then, Raman, but it's easy to lower the front pressure a bit by turning both TBs a bit. BTW, there are no front and rear pressure sensors - - there's only one pressure sensor in the ahc system.
  16. uHu

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

    Deleted dbl post. (Where did the delete button go?)
  17. uHu

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

    The sensors do nothing to L/R lean. There is an open hydraulic connection between L & R fronts (same for the rears) so that you always have the same pressure and "AHC lifting" on both sides. The connection is closed when you drive in curves. The front height is set by the average between L & R...
  18. uHu

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

    That is a delta of 1.3". Not too bad, but you can (should?) adjust the two sensors so that the delta is < 0.3". If you adjust only one of the sensors, you'll end up with the front higher or lower, depending on which one you adjust to match the other.
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