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Old 09-25-2009, 08:32 AM   #1
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Accuracy of DIC's Tire Presssure Reading

Anyone else notice problems with the accuracy of the tire pressure displayed by the DIC?

I got really tired of the wide swings of the readings on the DIC and I had the compressed air drained and nitrogen put in my tires yesterday. I gave the shop instructions to air up all tires to 38 psi. I trust this shop and they have very good tire pressure gauges since they specialize in tires. I checked the DIC upon getting into the car right after the work was done and all tires read 37 except for the back left tire which read 35. One psi off is nothing to worry about.

I seem to consistently have a lower reading on the left rear tire which always concerns me but I'm starting to think the problem is with the sensor on that tire. Anyone else have a similar problem? Should I take it to the dealer and have them look at it?
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Old 09-25-2009, 08:37 AM   #2
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I find it to be pretty accurate. Remember they will fluctuate about 5psi given outside temp and tire temp. Mine start out at about 38-39 when cold and hit 42 all the way around when the tires are warmed up. I filled mine according to the cars gauge. Most mechanic shops use gauges that go to like 90psi, so the readings on them wont be super accurate.
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Old 09-25-2009, 08:40 AM   #3
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Mine does the same thing. The outside temp and the tire temp makes a difference. It could be up to 4 or even 5 psi it the most I've noticed on mine so far.
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Old 09-25-2009, 08:51 AM   #4
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Do you notice one tire reading quite a bit off from the others, or are they all pretty consistent? This one back left tire of mine consistently runs 2-4 psi (usually 3-4) lower than the others on the DIC but on a gauge it's the same as the others.
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Old 09-25-2009, 09:14 AM   #5
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I've noticed the same thing on mine. I set my tires at 40 psi and I have a digital pressure gauge so it's accurate within 10ths of a pound. I had just put 40 in all 4 tires and I checked the DIC and it said 37 on 3 of them, and the right rear was 35. So i'm not going to rely on it other than it might be useful if you have a tire going flat. I wonder if there's a way to calibrate them? Since it's a computer readout I would think the dealer or maybe a good tuner shop can do that.
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Old 09-25-2009, 09:28 AM   #6
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I do occasionally have 1 or 2 tires that read 1-2 psi lower than the other but not 4. Simple way to check is get in the car when its cold, turn it on, see what the sensor says the tire pressure is, turn the car off, and check the tire pressure with a regular pressure gauge. If there is a big difference then I would take it to the dealer and let them check the sensor.
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Old 09-25-2009, 09:29 AM   #7
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Thanks Doc. Glad I'm not the only one noticing this. I'll ask the service department if they can look into that the next time I have it in. I think I'm just going to rely on the gauge for now and not the DIC.
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Old 09-25-2009, 09:31 AM   #8
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Be sure to buy a nice analog tire pressure gauge that only reads to about the pressure you want to run in your tires, as opposed to 50psi more. You will get a better/more accurate reading that way.
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Old 09-25-2009, 09:32 AM   #9
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Quote:
Originally Posted by Outlaw View Post
I do occasionally have 1 or 2 tires that read 1-2 psi lower than the other but not 4. Simple way to check is get in the car when its cold, turn it on, see what the sensor says the tire pressure is, turn the car off, and check the tire pressure with a regular pressure gauge. If there is a big difference then I would take it to the dealer and let them check the sensor.
Yes, that is exactly what I've done and the DIC reading on this one tire is always much lower and "off" from the gauge reading than the others. The other tires always read within 1-2 psi from the gauge so it's pretty accurate except for this one tire.
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Old 09-25-2009, 09:35 AM   #10
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Also press the reset button and it gives you the option to relearn your tire pressure. It takes about a min to do.
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Old 09-25-2009, 09:35 AM   #11
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Quote:
Originally Posted by rodimus prime View Post
Be sure to buy a nice analog tire pressure gauge that only reads to about the pressure you want to run in your tires, as opposed to 50psi more. You will get a better/more accurate reading that way.
The one I have only goes up to 60 psi so I think that should be fine right?
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Old 09-25-2009, 09:35 AM   #12
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Originally Posted by rodimus prime View Post
Also press the reset button and it gives you the option to relearn your tire pressure. It takes about a min to do.
Okay maybe that's what I'm doing wrong Now I feel really stupid. LOL
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Old 09-25-2009, 09:38 AM   #13
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Yeah, but a pound or so off might be normal.

As long as its like this one, it should be good to go.



Your not a professional racer (I dont think) so 1 or two pounds isnt going to be noticable anyways.
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Old 09-25-2009, 10:42 AM   #14
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I precisely set my tire pressures at 35lbs using a good analog gage and my DIC readings are usually under by a pound. Ive determined that the only thing the DIC readings are good for is a puncture or valve stem gone bad.
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