Jarring AHC ride post pump replacement

[kunu]

So I replaced my AHC pump this month and ever since my ride has been horrific over little bumps in the road. Almost to the point where it’s undrivable. One thing I did was swap the pressure sensors on the new pump with the old pump. Since I ordered the later model year and they have different plugs. It seems like it works but I have a error code showing in tech stream now

The system functions perfectly. Ride height remains steady, goes up and down easily. I have 12ish graduations from Hi to Lo.

I got my tech stream and took some photos of the results. I know there's some adjustments that need to be made but l'm not sure if what's showing should be this jarring. I’ve seen another Mud post that seems to mimic my symptoms and his problems was fried wiring.

I’m a total noob and don’t wanna just start cranking on things. I was gonna replace globes but the graduations are fine. Was gonna just let Lexus or Toyota poke around with it but I’m sure they’ll tell me to just replace the globes.

Any feedback would be appreciated.

 

[kunu]

So I replaced my AHC pump this month and ever since my ride has been horrific over little bumps in the road. Almost to the point where it’s undrivable. One thing I did was swap the pressure sensors on the new pump with the old pump. Since I ordered the later model year and they have different plugs. It seems like it works but I have a error code showing in tech stream now

The system functions perfectly. Ride height remains steady, goes up and down easily. I have 12ish graduations from Hi to Lo.

I got my tech stream and took some photos of the results. I know there's some adjustments that need to be made but l'm not sure if what's showing should be this jarring. I’ve seen another Mud post that seems to mimic my symptoms and his problems was fried wiring.

I’m a total noob and don’t wanna just start cranking on things. I was gonna replace globes but the graduations are fine. Was gonna just let Lexus or Toyota poke around with it but I’m sure they’ll tell me to just replace the globes.

Any feedback would be appreciated.View attachment 4018824View attachment 4018825

I’ve also bled the system. I know it’s not air either

 

[Petertn45]

If your globes are original/old, then they probably need to be replaced. Your front pressure is high.
My ride got better after replacing all of mine last year, and my numbers are normal range.

 

[kunu]

If your globes are original/old, then they probably need to be replaced. Your front pressure is high.
My ride got better after replacing all of mine last year, and my numbers are normal range.

Yeah they’re original. I was going to replace them anyways. I’m sure it will improve. But im more concerned about something else going, since it’s gotten significantly worse since I put the new pump in.

 

[Petertn45]

Do you know what your pressures were before the replacement?

 

[kunu]

Do you know what your pressures were before the replacement?

I don’t unfortunately. But my ride definitely wasn’t perfect perfect. There were drives that felt like butter and others that were a little jarring over small bumps.

But nothing like this.

Something else to note. My vehicle won’t cycle from any AHC when I’m in park. I actually have to be coasting in drive or reverse. HOWEVER, after installing the pump I could cycle while in park. And after bleeding it this week I was able to cycle it in park. I’m thinking this is related to the high pressures?

 

[Snow Wagon]

Hello kunu,
Any luck fixing the harsh ride?

It sounds like you've gone through most of the basics, but I'd start there 1st.
This is what I do on every one I service.
What's your mileage?
IMO, globe wear is more related to mileage and high pressures, not age.

Have you done a fluid flush?
If not, I'd do the steps below 1st, document your results, then do a fluid flush, then repeat the steps below, then compare to your pre-flush results.
Bad fluid can cause all sorts of problems.
Note: Only use AHC fluid from a 2.5 Liter Can, not a 1.0 Liter Plastic bottle (Toyota had issues with bad fluid in the Plastic bottles).

Height Check: Height Reading at Normal Height at All 4 Corners (Level Ground, SUV Running):
Front should be 19.75” Hub Center to Fender
Rear should be 20.5” Hub Center to Fender

Adjust Torsion Bars to get the Front Cross Level
1 Turn on 1 Torsion Bar Bolt will raise / lower that corner ~1/8”
The goal is less than 1/4” Difference between Driver and Passenger Front

Pump Test (from Press of Button to Flashing Light going Solid)
How long does it take to go from N to L? Should be 10 seconds or less.
How long does it take to go from L to N? Should be 15 seconds or less.
How long does it take to go from N to H? Should be 15 seconds or less.
How long does it take to go from H to N? Should be 10 seconds or less.

Globe / Graduation Test
Put SUV in Low (Wait 60 Seconds After Low is Reached).
Put a piece of Painter's tape in the Reservoir and Mark the fluid level in Reservoir (easy to see with a light behind the reservoir)
Put SUV in High (Wait 60 Seconds After High is Reached).
Mark fluid level in Reservoir.
The number of graduations / ticks on the Reservoir between Low and High should be at least 7. New / very good globes are around 12.

Pressure Test
SUV with a Full Tank of Gas and with the items that are usually in it (i.e. rear seats, drawers, etc...).
SUV on Level Ground.
Disconnect Fluid Temperature Sensor (IMO Optional…)
- On the side of the pump assembly, rear connector with 2 wires
- Center connector with 3 wires is the pressure sensor
- Forward connector with 2 heavier blue and white wires is for the pump motor

Vehicle Height L.
Connect the TechStream Cable to the OBDII Port under the dash.
Start Oracle VM VirtualBox.
Start TechStream.
Enter Vehicle Information.
Double Click on AHC.
Click on Data List.
Change Vehicle Height from L to N.

Read Pressures after SUV has finished raising.
Front Pressure should be 6.9 +/- 0.5 MPa
Rear Pressure should be between 5.6 & 6.7 MPa

Enjoy.
Tom