check tire pressure warning

the check tire pressure warning has come on on my wifes 2000 Buick Electra. I can reset it and sure enough it returns after 5 minutes of driving. The pressure in the tires is of course ok and i tried 30 psi and 32 psi without
any success. When it first came on there was one tire with 26 PSI and the rest were 28 and 29 PSI.
Anyone have any ideas or is it a trip to the dealer? The car has 50k miles on it and has been pretty trouble free except for the inlet manifold replacement.
TIA, Bob
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Bob wrote:

If you are sure that the tire pressures are correct now, and that the tire types are very similar, then simply go through the printed tire pressure sensing calibration procedure. It involves driving for miles at each of several speeds until the system learns.
---Bob Gross---
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All tires are exactly the same make and type and are only 15k miles old. I was unaware that there is a calibration process. What might have happened is that three were at 28 / 29 and one was at 25 /26 psi. Is the calibration process in the owner manual? Our local library does carry all of the Chilton shop manuals so I can look there tomorow evening. Thanks, Bob

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Bob wrote:

If the calibration procedure were in the owner's manual, then you would have it, wouldn't you? Forget Chilton or Haynes or anything like that. The Helm manual is the one complete with procedures.
---Bob Gross---
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"bob in ny" wrote

Tire Inflation Monitoring System Circuit Description The tire inflation monitor (TIM) system uses the EBCM, wheel speed sensors, class 2 serial data messages, and instrument cluster in order to perform the system functions.
The EBCM contains the software to perform the system monitoring functions. The EBCM uses wheel speed data obtained from the wheel speed sensors to detect relative pressure differences. Any ABS/TCS system activity causes the EBCM to temporarily suspend the tire inflation monitor system functions.
The software requires approximately one half hour of straight line driving to complete the TIM autolearn. There are several speed ranges that the EBCM needs to learn the tire inflation configuration in order to have the full capability of detecting a low tire condition. The speed detection ranges are the following:
a.. 24-64 km/h (15-40 mph) b.. 64-113 km/h (40-70 mph) c.. 113-145 km/h (70-90 mph) Each speed range has 2 modes of low tire detection.
a.. Monitor Mode 1 b.. Monitor Mode 2 The EBCM learns the tire inflation configuration for each speed range independently. In Monitor Mode 1, the EBCM has only partially learned the tire inflation configuration for the speed range and has limited detection capability for a low tire condition. In Monitor Mode 2, the EBCM has fully learned the tire inflation configuration for the speed range and has full detection capability for a low tire condition. If the EBCM is not in Monitor Mode 1 or Monitor Mode 2, a low tire condition cannot be detected because the EBCM has not learned the tire inflation configuration of the vehicle. The EBCM may have fully learned (Monitor Mode 2) the tire inflation configuration in one speed range, but may have partially learned (Monitor Mode 1) or not learned at all the tire inflation configuration in the other speed ranges.
The instrument cluster, through the DIC, performs two functions related to the tire monitoring system.
a.. Displays the warning message CHECK TIRE PRESSURES when commanded by the EBCM, via the class 2 serial data message. b.. Sends the tire inflation monitor system reset command to the EBCM, via the class 2 serial data line. The class 2 serial data line is used to send all tire pressure monitor system related information between the EBCM and the instrument cluster.
Ian
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With the DIC in Tire Presure mode, Press and hold the reset button until the read out displays the word reset. Then follow the procedure below. Thats what I had to do with my 2000 buick lesabre to get it to reset last week.

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I have done a reset thru the DIC as described in the owner manual. Unfortunately i wont know if that fixed it until my wife goes to work tomorrow. i will let you al know. Thanks for the help
Bob

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Well, the reset / recalibration appears to have worked. My wife said that after about 10 minutes the DIC said Tire Pressure Normal and after two 30 minute trips to and from work all is still well.
Thanks for the help

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Well, the reset / recalibration appears to have worked. My wife said that after about 10 minutes the DIC said Tire Pressure Normal and after two 30 minute trips to and from work all is still well.
Thanks for the help

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