Quick test of RDK

Whenever a wheel or tire is changed, it is essential to perform a quick test of the tire pressure control system.

If only one wheel was removed, the quick RDK test need only be performed at this wheel.

A short test drive for a distance of at least 20 meters, at a road speed of between 5 and 40 kph and at the following tire pressures is sufficient:

1. Tire pressure 0.5 bar below nominal value:* front 2.0 bar rear 2.5 bar (2.0 bar for 17" summer tires)

The relevant arrow(s) must flash on the instrument cluster display panel.

If an arrow is continuously illuminated instead of flashing, one pressure sensing switch for the wheel converned is faulty and must be replaced. (Check pressure sensing switch by using the 9288 system tester, see Page 44 - 311).

Do not drive the car at more than 50 kph. Above this speed, the display always begins to flash.

2. Tire pressure 0.5 bar above nominal value:* front: 3.0 bar rear: 3.5 bar (3.0 bar for 17" summer tires)

No fault display should occur. If it does, this indicates a system fault or a faulty pressure sensing switch (diagnosis from Page 44 - 301 on).

3. After the quick test, restore tire pressures to the nominal value*, or preferably 0.3 bar above the pressure sensing switches' switching points (Page 44-27).

* Nominal tire pressures: front 2.5 bar / rear 3.0 bar (17" summer tires = 2.5 bar) at 20' C tire air temperature

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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