2010 LX570 Globes Replaced, AHC won't lift the car.

[andyroyale]

I've had my 2010 LX 570 for a couple of years. The ride was not always that great but it got progressively worse.

I finally decided to replace the accumulators as DIY project. All look original and 3 of them had 0 diaphragm left. The pencil test goes all the way about 6 inches.

It's interesting to read the service history on this car.

When the suspension started acting up (my problem exactly) with the previous owner in 2020, he took the car to the Lexus in Tampa and instead of replacing these shot accumulators, they replaced the shocks. And then again in 2023. 16 years of history show no replacement of the accumulators. The previous owner finally dumped the car roughly a year later at a steep discount and now I feel bad for the guy, thinking that the solution might have been simpler

Anyway, I drained the system and replaced the globes and now the car won't lift. It is stuck in the C1763 error. I've tried several recommended solutions such as bleeding all corners etc. I also read that I need to bleed the HCA unit but I can't find it. I used my AUTEL scanner and was able to budget the pump with the pump relay but still no lift. By the way, I drained the system with the car on HIGH (some dude on YouTube said it drained better, but I think it might have created more issues).

Anyway, I disconnected the battery overnight to see if perhaps the ECU can be reset. Hoping that someone could give me some pointers. If I need to bleed the HCA unit, where is it? If that has nothing to do with it, how do I wake up the pump? It's also incredibly stupid of Lexus to put the reservoir where it is. There's no way to check the level. I topped it off with the car on low and it still won't lift.

Hopefully you all can give me some help.

Thanks.

 

[Taco Supremo]

Hi Andy,

Sorry to hear you're having some troubles with the AHC.

There is a whole thread on the main 200 series forum page on AHC.

Long story short, you need to read the level in the tank to ensure the pump always has fluid during the bleeding after a globe change. Don't run it dry.

A few good videos on reading fluid level in tank etc. Bleed from normal to low and take small steps...

 

[sdnative]

Did you install the accumulators in the correct positions? There should be two high pressure accumulators and two low pressure accumulators.

 

[andyroyale]

Did you install the accumulators in the correct positions? There should be two high pressure accumulators and two low pressure accumulators.

I didn't realize beforehand, but the car is driving so smoothly that I think I may have installed them correctly without knowing!

Is there a way to check on the globes themselves? I can't find anything about rear or front on the old ones.

 

[paulunm]

I think there's a stamping on the side of the globes. Check out the pics in this listing

https://www.ebay.com/itm/313855142616?mkcid=1&mkrid=711-53200-19255-0&siteid=0&campid=5337589904&customid=&toolid=10001&mkevt=1

 

[andyroyale]

I think there's a stamping on the side of the globes. Check out the pics in this listing

https://www.ebay.com/itm/313855142616?mkcid=1&mkrid=711-53200-19255-0&siteid=0&campid=5337589904&customid=&toolid=10001&mkevt=1

I saw that in the old ones but there's no indication that it pertains to the position.

 

[paulunm]

I saw that in the old ones but there's no indication that it pertains to the position.

I thought the front/rear have different stampings on them. Stampings aren't the part numbers on the boxes unfortunately.

 

[andyroyale]

I thought the front/rear have different stampings on them. Stampings aren't the part numbers on the boxes unfortunately.

This is from another thread

-----------------------
"MUV: spherical accumulator with rubber-resin layered diaphragm." This is from the site ekkeagle.com, which also says "The MUV series incorporates a plastic laminated diaphragm produced by polymer materials..."
EKK Eagle is a Japanese company making such globes.

The -400 corresponds to the capacity of the front globes. The rear ones would then be -500.
The 200 corresponds roughly to the nominal pressure in bars (226 bar for the fronts) but is more likely just the model series.
-----------------------

Yet, in another thread they say that the H at the end of the number indicates high and low pressure. I checked mine and they're all -400 H. That must explain the unbelievable ride I'm getting right now Did I just get a great idea on "all fours"?