RECENTLY , FOR THE 3RD TIME OVERALL, THE TPMS LIGHT CAME ON AGAIN ! BUT THIS TIME AROUND, I TRIED (& FAILED) TO CALIBRATE THE TPMS AS OUTLINED IN THE MANUAL. SO, ITS GOING BACK TO THE DEALER TO REPLACE THE LR SENSOR (THE 1ST TIME WAS THE LR, THE 2ND TIME WAS THE RR)

WHAT IF IT KEEPS DOING THIS, ESPECIALLY AFTER THE WARRANTY RUNS OUT? MY WIFE SEEMS MORE UPSET ABOUT THIS THAN I AM, AFTER ALL, ITS MOSTLY HERS & I TOLD HER THAT I BELIEVE THAT TMPS'S ARENT 100% RELIABLE YET. MAYBE IN THE FUTURE , MANUFACTURERS WILL HAVE MORE RELIABLE TPMS ON VEHICLES. ANYONE KNOW HOW LONG TPMS HAVE BEEN AROUND FOR SURE?

 

I have a OEM system on my '02 Impala. It only says there is a tire low but doesn't tell which one. Only showed low pressure once since we had it.

 

Had my lr tps replaced and had no problem since. These tps's are not a 100% item. sometimes you have good ones, sometimes defective ones. Sooner or later they will be OK. I worked in GM oshawa plant and they have the same problem when tires, rims and tps are installed. Some are just defective. These little do dads do take an awful lot of beating, so try to be patient because there are plenty of others with the same problem.
Just try and enjoy the ride

 

My brother had nothing but problems with the one on his wife's Mazda so I'm not sure we can blame Chevy on this. Neat feature when it's working though..I hate checking tire pressures the old fashion way...

 

This may be a dumb ? but if you change rims and tires to say 20" Will it still read everything correctly?

 

Either you can do it the dealer should be able to do it for you, just get them recalibrated. Truckin just did this on a Silverado and jumped to 20 and big meats on a how to. They had the sensors moved to the new wheels and then took it to the dealer to recalibrate them.

 

you got the linky on this article?

 

The rim diameter does not mean anything. What is important is the actual tire diameter. If that remains the same, or is close, no big deal.

If you want to get picky about it, any variance would have to be entered into the calibration and re-written to allow for any difference and keep speed and odometer readings correct.

In the HHR SS calibration they use "pulses per mile". This is read by how many "bumps" there are on the reluctor and I'm not sure what that is without looking into it. The stock calibration value is 67164. Any deviation would need to be calculated and a proportional value would have to be entered and written to the calibration to keep things accurate.

Easy method: Go to www.tirerack.com. Look up your OEM tire size and look at the specs, particularily the rev/mi. If you are looking at 20" sizes, look to match the OEM figure and everything should be OK.

 

As long as the sensors are removed from the OEM wheels and installed in the new wheels it will read them, after being calibrated. Here is how the system works.

When the vehicle is stationary, the sensors internal accelerometer is inactive, which puts the sensors into a stationary state. In this state the sensors sample tire pressure once every 30 seconds and do not transmit at all if the tire pressure does not change. As vehicle speed increases, centrifugal force activates the sensors internal accelerometer causing the sensors to go into rolling mode. In this mode, the sensors sample tire pressure once every 30 seconds and transmit in rolling mode once every 60 seconds. The RCDLR receives and translates the data contained in each sensors RF transmission into sensor presence, sensor mode, and tire pressure. The RCDLR sends the tire pressure and tire location data to the DIC via the serial data circuit where they are displayed.

The sensors continuously compare their last pressure sample to their current pressure sample and will transmit in re-measure mode if a 8.3 kPa (1.2 psi) change in tire pressure has been detected in either a stationary or rolling state. When the TPM system detects a significant loss, or gain of tire pressure, the tire pressure monitor indicator icon is illuminated on the IPC and if equipped, a check tire pressure type message is displayed on the DIC. Both the indicator icon and DIC message can be cleared by adjusting the tire pressures to the recommended kPa/psi and driving the vehicle above 40 km/h (25 mph) for at least 2 minutes.

If you want to know how accurate your speedometer will be before changing tire/wheel sizes, try this link. Input your OEM sizes and then your new sizes and you can see what the variation will be.

http://www.web-cars.com/math/tiresize.html

 

Sorry, no. I looked over the whole web site, it was Sport Truck magazine too by the way the July 08 issue "Skyscraping Silverado", and it isn't there. But I quote "This is the tire sensor that tells you if you have low tire pressore. We took the sensor to the dealer and had it reprogrammed from 80 psi to 42 psi for the wheel-and-tire combo we chose."