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77Cherokee 12-09-2011 10:05 AM

Does TPM System Monitor Air Temperature?
I keep the tires at 35 lbs. This morning it was 30 degrees outside. When I started the Jeep the tire pressure was 31-33 in all tires. The system did not post a warning, even after ten minutes of driving. I'm wondering if the warning message is tied into the ambient temperature and programmed not to display a message when it is cold, or does it possibly change the allowable range?

ColdCase 12-09-2011 10:10 AM

Re: Does TPM System Monitor Air Temperature?
No temperature compensation. For my Jeep with 20 inch tires, the warning is not indicated until pressure is below 29 or 30 psi. Once set, the warning won't reset until 33psi is maintained. I dunno if the thresholds are different for 18 inchers

77Cherokee 12-09-2011 10:29 AM

Re: Does TPM System Monitor Air Temperature?
That would explain it. Up until now it hasn't been cold enough to drop the pressure and I wasn't aware of the lower limits. Some posters here have reported warnings at 33-34 lbs. Thanks CC.

Willir2 12-09-2011 01:15 PM

Re: Does TPM System Monitor Air Temperature?
I have 18" - When it gets to 29psi or lower you will get the warning. Look in your Driver side front door jam and it will state that tires should be inflated to 33psi. Now if you get after market tires that can change.

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