RPA- HOW DOES IT WORK
05-01-2009, 08:58 AM
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i have an e60 530d sport with the run flat 18s as standard fitment.
today i put on a set of 172's, they are original wheels, i do not know if they have any sensors inside for monitoring tyre pressure. anyway, i put them on and the system showed under rpa that status is ACTIVE and i drove for about 2 miles then the red warning light came on that i have a puncture. I looked into the manual and read that you should reset the system if you put air in or change a wheel etc.... the system then reads intialising and has not changed so far. the maunual says it will complete this process in due course. i want to ask do my wheels need some kind of sensors inside or does this system work without sensors?? any help much appreciated.
today i put on a set of 172's, they are original wheels, i do not know if they have any sensors inside for monitoring tyre pressure. anyway, i put them on and the system showed under rpa that status is ACTIVE and i drove for about 2 miles then the red warning light came on that i have a puncture. I looked into the manual and read that you should reset the system if you put air in or change a wheel etc.... the system then reads intialising and has not changed so far. the maunual says it will complete this process in due course. i want to ask do my wheels need some kind of sensors inside or does this system work without sensors?? any help much appreciated.
05-01-2009, 11:46 AM
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You may need to drive for several miles before the system will become 'Active'.
Check the tyre pressures then set the system to initialise itself and drive. I have found that the less turning you do ie a 'straight' bit of road the quicker it will reset itself.
The system requires a measurement of the number of rotations the wheels give based on inputs from the ABS system over a set distance.
A wheel with a flat tyre will have to rotate more times over a given distance than a fully inflated one.
The later cars have individual wheel sensors and will show which wheel is showing low pressure as opposed to a blanket flat tyre warning.
Check the tyre pressures then set the system to initialise itself and drive. I have found that the less turning you do ie a 'straight' bit of road the quicker it will reset itself.
The system requires a measurement of the number of rotations the wheels give based on inputs from the ABS system over a set distance.
A wheel with a flat tyre will have to rotate more times over a given distance than a fully inflated one.
The later cars have individual wheel sensors and will show which wheel is showing low pressure as opposed to a blanket flat tyre warning.
05-02-2009, 01:21 AM
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Originally Posted by daven' post='865471' date='May 1 2009, 07:46 PM
You may need to drive for several miles before the system will become 'Active'.
Check the tyre pressures then set the system to initialise itself and drive. I have found that the less turning you do ie a 'straight' bit of road the quicker it will reset itself.
The system requires a measurement of the number of rotations the wheels give based on inputs from the ABS system over a set distance.
A wheel with a flat tyre will have to rotate more times over a given distance than a fully inflated one.
The later cars have individual wheel sensors and will show which wheel is showing low pressure as opposed to a blanket flat tyre warning.
Check the tyre pressures then set the system to initialise itself and drive. I have found that the less turning you do ie a 'straight' bit of road the quicker it will reset itself.
The system requires a measurement of the number of rotations the wheels give based on inputs from the ABS system over a set distance.
A wheel with a flat tyre will have to rotate more times over a given distance than a fully inflated one.
The later cars have individual wheel sensors and will show which wheel is showing low pressure as opposed to a blanket flat tyre warning.
looking nice on the 172's glistening in the lovely sunshine we have today!!
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