Indirect Measuring System, RKA (Tire Pressure Monitoring System)
TPMS indirect measuring. There are no wheel electronics installed inside the wheel. With the help of the ABS sensors, the TPMS compares the tire tread circumference of the individual wheels.
The system must be reprogrammed after every wheel mounting, regardless of whether it is at the same position or it is for a different wheel.
These Statements Refer to Legal Requirements in the European Union. No Claims Are Made as to Their Completeness.
General Information
The tire pressure monitoring system is included in the software in the ABS Control Module -J104-. The system will recognize a slow and gradual decrease in tire pressure on a wheel. The DTC memory entries for tire pressure monitoring system are stored in the ABS Control Module -J104-. With the help of the ABS speed sensor, the TPMS compares the speed and rolling circumference of the individuals tires.
After the following work and/or changes and with the ignition switched on, the Tire Pressure Monitoring Display Button -E492- must be pressed until the confirmation chime sounds:
- Change in the tire pressures
- A change in one or more tires
- Changing a tire, for example, from front to rear
- Removing or installing one or multiple tires
If a tire has changed in circumference, the Tire Pressure Monitoring Display Indicator Lamp -K220- in the instrument cluster will turn on. Rolling circumference of a tire may change due to:
- Insufficient tire pressure
- Structural damage on tires
- Vehicle is loaded heavily on one side
- High load on one axle, when towing trailer for example
- When snow chains are used
- Spare wheel is mounted
- One wheel is replaced
Depending on the vehicle the basic setting is performed in different ways.
Make sure to pay attention to the vehicle service information.