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post #1 of 34 (permalink) Old 01-20-2006, 01:55 PM Thread Starter
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pressure monitoring system

After my 6000 mile inspection, the dealer rotated my tires and adjusted the air pressure. I now find myself in the situation, where I can either trust my two handheld pressure devices, or the internal car monitoring system. Hereby, I am not so worried about exact measurements, but to have pressures equally distributed. If I pump up all 4 tires the same way (35 psi on the dial, measured the same way), the car monitor shows 35, 34, 34, 33. Any suggestions for calibration (again, not to absolute psi, but to a relative measurement)? Mercedes does not show individual measurements and I am sure that it is for this reason. The system is not accurate enough and will drive drivers like me crazy. The solution could be (Jeep > hint!) to use the "reset" button to average the tire pressures left and right and show the developing differences in the future. But for now ... what choice do I have? Either have "nice and equal" readings with truly different PSI, or the opposite
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post #2 of 34 (permalink) Old 01-20-2006, 04:27 PM
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Re: pressure monitoring system

Makes ya wonder if your gas gauge is correct...

I don't think 1 pound difference in air pressure is anything I would be concerned about. Now if it was over 3 or 4 then I would do a little adjusting.

I notice that even when all pressures read the same when cold, that while driving the tire pressure does not increase/decrease evenly according to the TPM system...It's the same on our 2K3 GC Limited. But it is still a big improvement over no monitoring at all.
JC
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post #3 of 34 (permalink) Old 01-20-2006, 07:06 PM
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Re: pressure monitoring system

As far as them not increasing / decreasing at the same rate... makes perfect sense. Different tires will heat up differently depending if they are front or rear or on the inside or outside of the corner when turning, etc.
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post #4 of 34 (permalink) Old 01-20-2006, 08:08 PM
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Re: pressure monitoring system

Mine is pretty close to the guage. Also, they change by almost 10 degrees at times, depending on use.
I don't know of any way to "calibrate" them.
Good luck and let us know if you find a way.
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post #5 of 34 (permalink) Old 01-21-2006, 10:06 AM
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Re: pressure monitoring system

It says in the owners manual that this system is not designed for exact measurements and is only a quick reference on tire presure. Do your actual pressure readings with a manual pressure gauage at the stems....This system is only to monitor approx pressure and should only tell you when you have serious air loss....
Someones pretty anal if ya ask me..LOL
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post #6 of 34 (permalink) Old 01-30-2006, 01:14 PM Thread Starter
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Re: pressure monitoring system

... thank you for all your input ... I have ran a series of tests and found the error of my two gages (inexpensive stick and expensive dial) to be large enough to fit into the perceived error range of the Commander's display. Hence, after adjusting to the dial, I drove around the block (in both directions, as tire loads are different) and made fine adjustments to the air pressures until I got them all correct and within the tolerances of my gages. Having spend some time on this (I know some will shake their heads ... but I drive fully loaded long distances at high speeds), I think that I will fill to my gages display (a bit on the high side) and make the small fine adjustments by sticking my car key on the individual valve stem to let go where it is a bit high ... until the display is even.
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post #7 of 34 (permalink) Old 04-24-2006, 10:55 PM
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Re: pressure monitoring system

I'm loving the tire pressure monitoring system. My wife told me about a warning light on the dash and after checking found a nail in the front tire. Didn't realize we had this feature, thought this was only on the "Limited".
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post #8 of 34 (permalink) Old 04-25-2006, 06:20 PM
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Re: pressure monitoring system

The limited measures all 4 tires individually. The base model etc. will tell you when one is too low, but it will not specify which one or give pressure readings
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post #9 of 34 (permalink) Old 04-25-2006, 06:34 PM
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Re: pressure monitoring system

Yea, base model uses ABS wheel speed sensors vrs. in tire RF transmitter/dash receiver.
I know the G.Cherokees with in tire monitors used a calibration magnet to reset the system after a flat tire. Not with the Commander.
I was size testing different tires on ours at my work. After reinstalling the original tires I could not get the "Low Tire" warning display off. Giving up, on the drive home the system reset itself after about 10min.
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post #10 of 34 (permalink) Old 04-25-2006, 07:05 PM
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Re: pressure monitoring system

I was wondering if anyone knnows how to clear this, I replaced wheels and tires and now have the low pressure sensor flashing regulary
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