Tire pressure sensor question
Thread Starter
Le Mans Master
Joined: Dec 2005
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From: "This is not a psychotic episode, but a cleansing moment of clarity."
Tire pressure sensor question
Sorry if this has been asked before, but I couldn't find out by searching...
My display said that my left rear tire was running low on pressure and indicated 24lb. After driving the car around for awhile, the pressure went up to about 25lb. I put more air in, and with the engine off, just turned the key enough to check the readings. The pressure reading still says 25lb, but my old school handheld tire pressure gauge reads 30lb. Do I need to drive around for awhile before I get an accurate reading? Or is something wrong with the sensor?
My display said that my left rear tire was running low on pressure and indicated 24lb. After driving the car around for awhile, the pressure went up to about 25lb. I put more air in, and with the engine off, just turned the key enough to check the readings. The pressure reading still says 25lb, but my old school handheld tire pressure gauge reads 30lb. Do I need to drive around for awhile before I get an accurate reading? Or is something wrong with the sensor?
Racer
Joined: Mar 2003
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You would be surprised at the lack of accuracy on "Old School" pressure gauges. As part of ISO we have to calibrate all our tire gauges periododically. We find variation in air pressure gauges often. If driving didn't make the difference between the two readings more similar, I would try using a KNOWN accurate pressure gauge.
Tech Contributor
Joined: Dec 1999
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
When the tires are not rotating the TPS go into a off line mode which saves battery life. Once the tires rotate at a a specified RPM or tire rotational speed, they wake up and start transmitting.
BC
BC
Race Director
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From: Fremont CA
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20
NCM Sinkhole Donor
When I change tire pressure, 3 tires register within the first minute. The fourth (front right) always takes at least 10 minutes to update. Don't know why - just the way it is.
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 6,420
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From: "This is not a psychotic episode, but a cleansing moment of clarity."
Originally Posted by boomer 33
You would be surprised at the lack of accuracy on "Old School" pressure gauges. As part of ISO we have to calibrate all our tire gauges periododically. We find variation in air pressure gauges often. If driving didn't make the difference between the two readings more similar, I would try using a KNOWN accurate pressure gauge.
I just drove my son to school this morning, never exceeding more than 45 MPH. So far, the pressure sensor is reading 26 lbs. I'll keep an eye on it.
