tire pressure sensor?
03-25-2008, 07:58 AM
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My Ride: 05" 545i 6 speed
when i try to set my tire pressure system through idrive in the standing position it starts "initializing" but i wait 5 min or so, and nothing happens. Wondering has anyone set their tps and how long did it take to set. ? Thanks
03-25-2008, 08:01 AM
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Originally Posted by 545ibimmer' post='550465' date='Mar 25 2008, 11:58 AM
when i try to set my tire pressure system through idrive in the standing position it starts "initializing" but i wait 5 min or so, and nothing happens. Wondering has anyone set their tps and how long did it take to set. ? Thanks
03-25-2008, 09:32 PM
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Originally Posted by yousefba' post='550467' date='Mar 25 2008, 08:01 AM
when you see "initializing" you have to start driving for about 10 mins.
Yup thats the key...
03-25-2008, 09:48 PM
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Originally Posted by yousefba' post='550467' date='Mar 25 2008, 09:01 AM
when you see "initializing" you have to start driving for about 10 mins.
+1
The older (aka our beloved 545's) TPMs don't actually measure the direct tire pressure. Rather, they measure the RPM's of each tire. When the car is traveling straight, properly inflated tires should spin at the same rotational speed. However, tires with significant pressure loss will rotate at slightly different RPM's than the others. This change flags the TPM and throws the warning.
When you 'initialize', you're telling the car to start counting the RPMs of the tires to set a baseline. Future changes from this baseline will result in a warning. That's why it is of utmost importance to ensure the tire pressures are, in fact, correct before initializing. Hope it helps explain things a bit! I think some of the more technically experienced members may offer more insight into this.
03-26-2008, 06:39 AM
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Originally Posted by advancedlogic' post='550891' date='Mar 26 2008, 01:48 AM
+1
The older (aka our beloved 545's) TPMs don't actually measure the direct tire pressure. Rather, they measure the RPM's of each tire. When the car is traveling straight, properly inflated tires should spin at the same rotational speed. However, tires with significant pressure loss will rotate at slightly different RPM's than the others. This change flags the TPM and throws the warning.
When you 'initialize', you're telling the car to start counting the RPMs of the tires to set a baseline. Future changes from this baseline will result in a warning. That's why it is of utmost importance to ensure the tire pressures are, in fact, correct before initializing. Hope it helps explain things a bit! I think some of the more technically experienced members may offer more insight into this.
The older (aka our beloved 545's) TPMs don't actually measure the direct tire pressure. Rather, they measure the RPM's of each tire. When the car is traveling straight, properly inflated tires should spin at the same rotational speed. However, tires with significant pressure loss will rotate at slightly different RPM's than the others. This change flags the TPM and throws the warning.
When you 'initialize', you're telling the car to start counting the RPMs of the tires to set a baseline. Future changes from this baseline will result in a warning. That's why it is of utmost importance to ensure the tire pressures are, in fact, correct before initializing. Hope it helps explain things a bit! I think some of the more technically experienced members may offer more insight into this.
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