Disconnected battery, TPM fault? - Mustang Evolution

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Old 07-04-2014, 05:24 PM   #1
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Disconnected battery, TPM fault?

Was running a power wire back to the trunk for subs and when I reconnected the battery I now get a "Tire Pressure Monitor Fault" message.

Could it be as simple as I need more air in the tires? How come it didn't go off earlier when I was driving around though?
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Old 07-04-2014, 07:22 PM   #2
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I'd say check the tire pressure. Maybe you picked up a slow leak.


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Old 07-04-2014, 08:38 PM   #3
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Have you tried to reset your sensors?
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Old 07-04-2014, 11:07 PM   #4
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Hey guys.

My tires are all at 29 PSI, which is good because they are all leaking at the same rate and that means they are in-fact probably low enough to trigger the TPM system (does it trigger at below 30? Just curious when it would trigger the warning) but is "Tire Pressure Monitor Fault" the message you get when you're low? I figured it would be like "Driver side Front tire low" or something cool like that... lol

Maybe reseting the cars computer by unplugging the battery just reset the whole system and now she's good to go?

I'll fill them up with air tomorrow and see if it was just a fluke.
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Old 07-05-2014, 07:39 PM   #5
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Well, I started my car today and the error didnt show up. Filled up the tires and away I went. Guess it was just a fluke.

When should the warning normally come on? what PSI?
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Old 07-05-2014, 08:19 PM   #6
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You didn't accidentally splice into the incorrect wire when you ran the wiring did you? On mine the TPMS goes off under about 25 PSI, might be slightly different for your generation, but I doubt it.
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Old 07-05-2014, 08:41 PM   #7
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Mine will hit just under 30 and will turn on.


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Old 07-05-2014, 11:51 PM   #8
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Disconnected battery, TPM fault?

A TPMS fault is the msg you get when there is an error in the system. Low tire pressure is what you get when your tires need air.

I had a bad sensor (band type in my 07 not the stem type) and got the "fault". Fixed with a new sensor ($25 off eBay).


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