Originally Posted by
doltmo
I think I figured out what happened.
I unwittingly assumed that since the left front was almost 40psi and the rest of the tires were around 30 psi that the MMI had screwed up, and misidentified the situation. A tire at 40psi is definitely not under-inflated. Hence my comment about not being good at math.
What I forgot is that the "Under-inflated" warning is due to the actual pressure in a tire being less than the stored value for that tire in the MMI. It has nothing to do with common sense or the pressures in the other tires. It's not obvious what that stored value is - and there's no way to display it on the MMI.
In this case, the stored value for the left front got changed somehow - to something greater than 40 psi. And in the tiny silicon mind of the MMI, the under-inflated message was correct. If the stored value for the left front was 50 psi, for example, 40 psi would definitely be "under-inflated".
I corrected the inflation issue and re-stored the values in the MMI.
All is well.
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