The use of tyre sealant, for example a flat tyre
kit, can damage the wheel electronics. Have
the electronics replaced at the next opportu‐
nity.
System limits
Temperature
The tyre inflation pressure depends on the tem‐
perature of the tyre.
The tyre inflation pressure increases as the tyre
air temperature increases, for example while driv‐
ing or when exposed to sunlight.
The tyre inflation pressure decreases when the
tyre air temperature drops.
Due to the system's inherent warning thresholds,
therefore, this behaviour may cause a warning to
be triggered when significant temperature drops
occur.
After a temperature-related warning, the nominal
pressures are displayed again on the control dis‐
play after driving a short distance.
Sudden tyre pressure loss
No warning can be given in the event of extreme,
sudden tyre damages caused by external factors.
Reset not carried out
Tyres with special approval: the system will not
function correctly if a reset has not been carried
out, for example, a flat tyre may be reported even
though the tyre pressure is correct.
Malfunction
Message
The yellow warning light flashes and then
illuminates continuously. A Check Con‐
trol message is shown. Tyre pressure
losses may not be detected.
Action
▷ A wheel without wheel electronics is moun‐
ted, for example emergency spare wheel:
have the wheels checked if necessary.
▷ Fault due to systems or devices with the
same radio frequency: the system is auto‐
matically reactivated upon leaving the field of
interference.
▷ For tyres with special approval: the system
was unable to complete the reset. Perform a
system reset again.
▷ Tyre Pressure Monitor malfunction: have the
system checked by a Service Partner of the
manufacturer or another qualified Service
Partner or specialist workshop.
Flat tyre monitor RPA
Principle
The flat tyre monitor detects a tyre pressure loss
while driving and issues a warning if the tyre
pressure has dropped.
General
The system identifies a tyre pressure loss by
comparing the rotational speeds of the individual
wheels during the journey.
A tyre pressure loss changes the diameter, and
with it the rotational speed, of the corresponding
wheel. The discrepancy is detected and reported
as a flat tyre.
The system does not measure the tyre inflation
pressure as such.
Operating requirements
The following requirements must be met for the
system, otherwise reliable message of a tyre
pressure loss is not ensured:
Seite 348
MOBILITY
Wheels and tyres
348
Online Edition for Part no. 01405A38CB9 - VI/21
To Next Page
Loading...
Need help?
General
