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Old 06-30-2008, 02:44 PM   #5 (permalink)
No Doubt
Z06 Master
 
Join Date: May 2002
Location: WA
Posts: 6,635
Re: TPMS racing defeat

Quote:
All you have to do is get a box and put the sensors in the box and pressure the box to 32 psig and put the box in the car.
That won't work. The TPMS has to 'see' the velocity of each sending unit, measured in rpm. Simply put, the wheels have to be turning at a rate equal to ~20 mph or more for >2 minutes . At that time each TPM sensor sends a signal on UHF frequency 315 Mhz to the car.

Each wheel has to have its own TPM sensor and each wheel must be installed on the car. Every time a wheel is put on or rotated to a different position you have to re-initialize all four sensors.

The default (stock) allowable tire pressure range is 28-39 psi.* The TPMS will display a warning on the DIC if a tire is over pressure and will default to Traction Control ON and Reduced Power Mode (aka "limp mode") if one is under pressure. At which time the DIC will display "Maximum 55 mph / Reduced Handling".

There is no way to disable the TPMS, in accordance with federal law.

If one or more TPM sensors are INOP or not installed a "Service Tire Monitor" message will be displayed on the DIC and a code will be set in the PCM. Pressing reset will remove the message from the DIC, but the code will remain in the PCM.

*The Remote Control Door Lock Receiver (RCDLR) is the Body Control Module (BCM) that receives the signals from the TPM sensors. It can be re-programmed with a Tech 2 to reflect different tire placard information, including nominal psi range. However, that is too much trouble to go through each time when swapping wheels/tires.

Last edited by No Doubt : 06-30-2008 at 03:56 PM.
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