Lexus LX 470 suspension system

16 Фев 2015 | Author: | No comments yet »
Lexus LX

Lexus LX 470 suspension system

The hard ride syndrome

In efforts to create the best-performing SUV in the industry, Lexus engineers sophisticated suspension feature on the for added convenience and performance on and With its rigid chassis, front suspension, Adaptive Suspension (AVS) and Adjustable Control suspension (AHC), the LX 470 far superior ride characteristics large SUVs

Adjustable Control suspension (AHC) the driver to adjust the vehicle height to three levels high, normal and low. The mode provides improved over rough terrain, the low mode affords improved of in and out access. The height control and indicator light work to the driver know at what the vehicle is as well as to indicate the height control depending on conditions. If set in the high mode, the AHC automatically lower the LX to the normal when the vehicle exceeds 19 When parked in low mode, the will automatically raise to height when pulling from a stop. The Adaptive Suspension (AVS), a semi-active absorber system, can react as as 2.5 milliseconds (about every 5 of road travel at 60 MPH), changing shock valving at each wheel. The computer selects from a range of 16 settings — one being and 16 being firmest — in range groups depending on from various road The AVS system senses road and continuously adjusts shocks to a or softer value as needed. The also is provided an adjustment for personal preference.

The Component Causing the Problem: A component of this system are the accumulators mounted to each of the 4 controlling the shock absorber The role of the accumulator is to absorb in) the oil forced out of the completely filled absorber when you drive a bump, AND to supply high oil to force the wheel down you drive over a hole. The pump role is supplying the amount of oil needed to the accumulators to the correct vehicle height.

What Happens?

However, is a thorn in the rose bush. All accumulators (simply accumulators slowly loose the gas precharge. The then rides extremely and hard. This is because is no space inside the accumulator for oil—all the gas is gone and the accumulator is The LX-470 accumulators are bladder accumulators, similar in construction to of Citroen, Mercedes Benz, etc. They are initially (precharged) on the gas side of the bladder dry nitrogen to several hundred Unfortunately, the LX-470 accumulators are costly due to the elaborate and non-standard and sealing groove they use to to the valve assemblies.

When installed on the vehicle, the pressure is whatever is needed to the vehicle at the ride-height required. (and most other car use conventional springs to support 60 percent of the empty vehicle and hydraulic pressure the balance.

As one from Lo to Hi height setting, the pump has to supply additional oil to the shock absorbers, and because the are also extended, their to load support drops, higher hydraulic pressure in the Obviously, adding payload the hydraulic pressures to rise more. Since the accumulators are connected to the shocks, the pressure in rises also, compressing the into smaller and smaller When fully loaded and at ride height, the pressure in the is several times higher when empty and at low setting. absorbing a bump, the pressure even higher- much or much, much higher if the pre-charge is low or gone. You feel much, much higher as a hard, bouncy ride the shock absorber cannot any because there is no space in the flat accumulator to receive the

Lexus LX

The system is sort-of protected over-pressure damage by pressure valves that allow the pressure (oil) to flow to the pump reservoir. You hit a bump, pressure sky-rockets, causing oil back to the reservoir—but now what? is less oil in the shock and the ride is too low-so the pump —which is for infrequent and short duation only—turns on and supplies the oil needed to the correct height—but -here another bump etc. After a few minutes of this battle, the pump shuts off do have some good features) because it obviously is not to fix the ride height problem. Now you bounce down to the bottom—riding on the stops—an unhappy low-rider.

Unfortunately, this condition can air to be sucked into the small pump, past the shaft which is intended to keep oil IN, not air Remember the flat accumulators do not any gas to expand and force oil into the as the springs push the wheel while you are flying through the with the wheel off the road The spring extending the shock a vacuum in the oil supply system—all the way to —the pump seal.


the Lexus factory diagnostic and procedure does not detect and this ‘air-locked’ condition. perfectly good, but air filled, hydraulic pumps are being with new (precharged, oil filled)pump several thousand dollars.

AHC AVAILABLE SEPARATELY $325

Thanks to a customer who had the ‘pump put out pressure’ symptoms (usually replaces entire assembly for $2400 in parts alone) Lexus/Toyota do sell just the itself (and O-rings

Lexus part numbers: sub-assembly #48901-60010; o-ring o-ring # -7003; AHC Lexus/Toyota fluid #0886-01805.

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