Air Suspension – Functions of GAP IID Tool – Discovery 3/4

Air Suspension – Functions of GAP IID Tool – Discovery 3/4

16. October 2020 Off By Kenny

The IID tool is a powerful tool for customizing your Land Rover vehicle and offers, among other things, the possibility to influence the air suspension in various ways.

Basically the IID Tool offers these functions:

  • Operation of all standard functions via cell phone app
  • Permanent reprogramming of the vehicle height
  • Individual height adjustment for each wheel or axle, levelling
  • Manual access to the system’s valves and air reservoirs


I would like to introduce the different functions and give examples what you can do with the different possibilities.

Operation of the standard functions via Handy App
Access via: IID Tool Main Menu –> Height Control

Height change using the IID Tool

With this function you have the possibility to operate the standard functions of the airframe via the Handy App and additionally there is the possibility to lower the vehicle to a very low level, for example when entering an underground car park or similar. This function is also useful for coupling trailers, for example, as the vehicle can be operated remotely. Although this is also possible with the key remote control, it is easier and more intuitive with the app and the hazard warning lights do not have to be active.

 


Permanent reprogramming of the vehicle height
Access via: IID Tool Main Menu -> Height Adjust

Programming of up to three individual height settings

With this function you have the possibility to create a total of three height configurations and save them for quick recall. To do this, click on one of the three memory locations and set the desired height change in the menu. You can choose whether the height change should be made uniformly on the front and rear axle or whether individual height values should be set for each axle. As soon as the stored height change is selected, it will remain until it is deactivated again. The value stored in the respective settings is considered as offset and remains identical in all “normal” vehicle modes of the air suspension system.

So if you program a height change of +15mm in a program this means that the vehicle height is 15mm higher at normal level, but at the same time the entry height and the terrain height is 15mm higher. The value “+15” therefore applies to all modes. The same applies of course to lowering the vehicle.

This function is useful in various situations. On the one hand the vehicle can be raised permanently. For example, if you program a height change of +30mm, this has the effect that in normal mode a lot of ground clearance is available and this ground clearance is maintained even when driving at speeds higher than 50km/h (otherwise the vehicle automatically lowers from off-road mode).

Conversely, this function is also interesting for long freeway journeys, so that the high-speed mode, which the vehicle sets only from 160km/h, can also be selected manually at lower speeds. For example, many people program a height change of -15mm for long trips on the highway and save this setting.

It is important here that the height changes are not programmed too extreme for continuous operation, as this can have a negative effect on driving dynamics, comfort and wear. If you still want to make such settings, you should have the camber of the tires checked in any case, otherwise the tires can be worn down on one side.

In our opinion, reasonable sizes are about -15mm to +25mm (without guarantee).



Individual height adjustment for each wheel or axle

Access via: IID Tool Main Menu -> Service/Test -> RLM Suspension

Programming options in the service menu of the air suspension

In this menu, various functions are available for selection. The “Test Valves” function provides active access to the individual valve blocks and enables each valve block to be individually controlled. After selecting this menu item, the display shows the message “Airframe not in customer mode” and the following view appears:

Message in the display says that the service mode is active

 

Test Valve view in the IID tool; here only the rear axle is varied in height

In this view you have quasi complete access to all three valve blocks on the front axle (left wheel, right wheel) on the rear axle (left wheel, right wheel) and to the main block on the compressor (front axle, rear axle).

The arrow keys now allow,
– open the valve to the accumulator “arrow up” (the pressure from the accumulator is let through to the air suspension, the vehicle lifts) or alternatively
– open the valve to release “arrow down” (the pressure from the respective bellows is released).

This way each axle can be raised or lowered separately or, if desired, the height of each wheel can be changed individually.

IID Tool: here only the height of the rear right wheel is changed

In this way you now have the possibility to level the vehicle (e.g. if you stand slightly crooked and want to sleep in the roof tent) or to carry out troubleshooting (individual control of the valves for raising or lowering).

 

Vehicle front raised, rear lowered
Vehicle front lowered, rear raised
Air suspension completely deflated

In addition to these options, there are other functions in the air suspension menu, such as changing the sensor tolerance, reactivating the “normal mode / customer mode = EAS” or the possibility of completely draining all air bellows (deflate corners) or even emptying the pressure reservoir (deflate reservoir) or both (deflate all).

The IID tool thus offers an enormous variety of possibilities for the adjustment of the landing gear and is therefore an extremely important helper in various situations.

 

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All information as always to the best of our knowledge and belief, but without guarantee!