25.11.2017
Toyota Land Cruiser Prado 150
KDSS (Kinetic Dynamic Suspension System) not working
Practical guide.
Step one.
In order to repair something, you need to know WHAT you are going to repair.
Therefore, we open the Internet, search, read, study:
Kinetic Dynamic Suspension System (KDSS)
https://www.youtube.com/watch?v=vxzWMO7uaJ8&feature=youtu.be
Toyota Land Cruiser 150 - KDSS (Kinetic Dynamic Suspension System)
https://www.youtube.com/watch?v=NLF6n3nMwww
KDSS on Land Cruiser 200
https://www.youtube.com/watch?v=jQyZPN6IrTU
The Kinetic Stability Suspension System (KDSS) controls the operation of the anti-roll bars to ensure stability and a smooth ride off-road (off-road). In addition, the system minimizes roll in corners. The system is hydraulic, but electronically controlled.
Receiving information from related sensors and depending on road conditions, this system can quickly change the characteristics of the anti-roll bars
The KDSS system structurally consists of:
- one hydraulic cylinder located on the front and rear anti-roll bars
- two hydraulic circuits connecting the over- and under-piston spaces of the hydraulic cylinders
- hydraulic cylinders act as a support for the front and rear stabilizers. When passing sharp and high-speed turns on the asphalt, the pistons cannot move towards each other
- KDSS rigidly connects the anti-roll bars to the body and effectively fights vehicle rolls
- when driving on difficult road terrain, the pistons move freely towards each other. The rigid connection of the stabilizers with the body disappears, thereby the suspension works more freely.
Step two.
I doubt that you have so much time that you want to spend it on professional study, for example, of the constructive component of the KDSS system:
On, on the Internet and beyond, the following expression very often comes across: "Electronics is the science of contacts." Therefore, I propose to move on to the next step ("step two" - the realization of the understanding that "everything complicated begins with the simplest").
Step Three
Since you already know approximately the structure of the system and approximately can identify the main components of the system, start with the most complex in the simplest - with system management.
But do not think about simple or deep electronics, repairing the KDSS system is elementary! Look under the body. Define one of the main items related to the KDSS system, here it is:
In the photo you see the removed connector. Do not be too lazy to look inside, there may be something extremely interesting - look in! And we see:
We see nothing here. But do not get upset and do not give up. In addition to this connector, there is also a "reciprocal" connector. Let's look and see:
Did you see? Let's get closer so as not to make a mistake and have a reason for joy and pride:
This is the so-called "green", in other words "oxidation", that is, the cause of the malfunction has been found.
As you can see, a malfunction of such a complex system as KDSS has been found, and it will not take long to fix it if there is right hands and brains.
In exactly the same way, you can easily repair other, most complex systems and devices, ranging from a malfunction "interruptions in the engine" and ending with the C2540 error in a Prius hybrid car.
The main thing is to read the Internet more. Everything is on the Internet.
Who knows, maybe you will be lucky to repair error C2540 in a hybrid car by cleaning or replacing certain contacts in a certain place?
Remember that studying electronics, knowing Ohm's law and other wisdom is completely unnecessary for someone who has firmly understood that "electronics is the science of contacts" and "automotive diagnostics is very simple!".
The main thing to know:
Where can this contact be located?
- whether this contact refers to the problem that causes a specific malfunction
- what malfunctions can this contact provoke during oxidation
- whether any contact is the "cause" of the fault, or this contact is the "effect"
- what tools are needed to measure voltage, resistance, current or other necessary parameters (if you don’t know what “current”, “voltage” and something else is, don’t be discouraged! All unfamiliar words are what is inside the car " runs, spins, or measures. Success with the client lies in a thorough knowledge of the concept of "approximately".
Well, a dozen or two dozen similar and simple conditions
Remember that "Automotive diagnostics - it's very simple!".
Before talking about the KDSS system, we think it is necessary to devote a little time to the company thanks to which it was born. If you didn't know, this electronic system was created in Australia in cooperation with the Japanese auto giant Toyota Motors. What do we know about the Japanese brand? The fact that thanks to Kiichiro Toyoda and several other prominent personalities who once led the automotive giant, the Japanese were able to bring Toyota Motors to first place in Asia in terms of the number of cars sold. 
AT recent history the Japanese even managed for some time to get ahead of Volkswagen itself, which owns more than a dozen automotive subsidiaries. This is at least exciting. Today, Toyota Motors is responsible for the emergence of the most prestigious Asian car brand. This, of course, is about the Lexus, on one of the models of which, by the way, the history of the system called KDSS began.
The above system first appeared on legendary SUV Lexus GX number 470. The car itself was launched in mass production back in 2002, however, the new work of masters from Australia in the form of a kinetic control system and a number of innovative “goodies” forced the production to begin introducing this development into new cars from 2004.
Success was not long in coming, because the premium SUV is still incredibly popular on all continents. For 4 years, only buyers of the Lexus GX 470 could enjoy KDSS, but since 2008, Toyota decides to introduce this development into its Land Cruiser 200. And after another two years, everyone's favorite Toyota Prado gets it. The electronic system was so successful that it was even "stuck" in a supercar from McLaren. Since 2012, it has been installed in the MP 4 12C model.
What is KDSS and how does it work?
So, what is the KDSS system? KDSS stands for Kinetic Dynamic Suspension System, which translates as Kinetic Dynamic Suspension System. It was developed in a town called Dunsborough, based in Australia. The rights to this invention belong to the R&D company, which develops hydraulic cylinders and other elements useful for cars. Electronic Kinetic Suspension Stabilization allows cars with impressive mass, which has the same Lexus GX 470 or Toyota Land Cruiser, to demonstrate the handling level of premium sedans.
The main feature of the KDSS system is the ability to switch to passive mode when the SUV is moving on a flat surface. But as soon as the car gets off-road, the fluid that circulates through the two hydraulic cylinders connecting the anti-roll bars and the body begins to move throughout the system. All valves are open and the fluid moving through them provides excellent controllability in general. The pistons inside the cylinders receive complete freedom of action from the system, which provides the car with maximum possible moves along the surface.
The name of the electronic system is not in vain, because the driver does not need to go into the details of its operation, since it independently cooperates with the car's electronics. As a rule, buyers who have purchased a car with this option are not even aware of its existence. The only thing that KDSS requires from its owner is a fluid change and a pressure balance check. Such a replacement occurs every 80 thousand mileage.
Conclusion
We didn't mention that electronic system kinetic stabilization of the suspension is additional option. The difference in the cost of a complete set is quite impressive, but such a high price tag is not without reason. For quite a long time the existence of KDSS, there were practically no negative reviews, but there are more than enough positive ones.
Judge for yourself, the development of Australian engineers allows you to improve the level of handling both on the track and off-road. Also, the system is an invaluable assistant in corners, because entering a steep turn at a decent speed, the hydraulics allow you to keep the car in a horizontal position, which provides perfect grip for an SUV.
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