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Tire Pressure Monitor System went stupid this morning
Ok...I drove the Croc to work yesterday, and it performed perfectly as it has for the 2700 miles I've driven it since I took delivery...this morning I open the garage door, get in and as soon as the key is in the ignition, I get the tire-pressure-low-by-four-psi-in-the-right-rear-tire message...hmmm, maybe this thing is a real life-saver, I thought...I get out and look at the right rear...hmmm, it 'looks' OK; I'll check it...I get out my tire guage, and it's OK, but just in case I'll check the other side...hmmm, it's the exact same pressure...so I get back in, start the car, and run the re-learn thing...I drive off, and a few miles down the road, it clears itself...everything's fine until I pull into my parking space, turn the radio off, then I turn the ignition off, and before I pull the key out, the system lights up again, only this time it's telling me that my right front is four psi low...I'll check it once the sun comes up, and I can see better, but I'm pretty sure that it will be OK...
No issues with the car so far, though when I bought it , I had a bad feeling about that tire pressure monitor...I mean, I've been driving since 1967, and have managed to keep my tires properly inflated so far without the intervention of a computer...I wish that I could pull that thing out by the roots, but I know that's impossible...
__________________
27 year PCA Member
Reformed Club Racer
PCA DE Instructor
low at the right rear, huh? Maybe our sending units/whatever were from the same lot -- the same issue with my C2.7 with 2200 miles. There were a number of other "threads" on this complaint... but it doesn't seem to have a real answer. The service manager in Fremont said to run the tires a couple pounds over the spec "-- and it gets better gas milage too". Right.
Given the numerous other comments about the TPMS going bezerk now and then, we are not alone. My only concern, as voiced elsewhere, is what do you do when the tire alarm goes off on a TrackDay in that high speed left hander at 95+ Hmmmm.. right now, I'm thinking: a) hold my breath till the straight, b) wet my pants till the straight, or c) put some duck tape over the warning lights in the morning.
Otherwise, I'm just going to ignore them until (maybe a zig/zag to test for bad handling) and run the reset option with the OBC.
D&D
TPMS
TPMS - The Tire Pressure Monitoring System provides early warning of any drop in pressure by continuously monitoring the pressure in each tire and alerting you in the onboard computer display in the event of a pressure deficiency. It communicates the exact pressure of each tire and/or their deviation from ideal pressure. This does away with the need for regular air pressure checks at the service station, which often prove highly inconvenient.
wow, me too...last week, right rear tire said -4lbs low...checked manually, and no difference...reset it, and it hasnt come back...happened to me just once so far...
Don't know if this is any help but worth keeping in mind. I notice that you're in Pa. You must be getting some cooler nights by now. The tires will loose some pressure as the temp drops. Maybe that's why the TMPS was nuts in the morning.
I'm in Virginia & it's been in the low 50's in the early AM. I'm running +2 PSI all around so I don't have to re-set the tires so often.
Ok...I drove the Croc to work yesterday, and it performed perfectly as it has for the 2700 miles I've driven it since I took delivery...this morning I open the garage door, get in and as soon as the key is in the ignition, I get the tire-pressure-low-by-four-psi-in-the-right-rear-tire message...hmmm, maybe this thing is a real life-saver, I thought...I get out and look at the right rear...hmmm, it 'looks' OK; I'll check it...I get out my tire guage, and it's OK, but just in case I'll check the other side...hmmm, it's the exact same pressure...so I get back in, start the car, and run the re-learn thing...I drive off, and a few miles down the road, it clears itself...everything's fine until I pull into my parking space, turn the radio off, then I turn the ignition off, and before I pull the key out, the system lights up again, only this time it's telling me that my right front is four psi low...I'll check it once the sun comes up, and I can see better, but I'm pretty sure that it will be OK...
No issues with the car so far, though when I bought it , I had a bad feeling about that tire pressure monitor...I mean, I've been driving since 1967, and have managed to keep my tires properly inflated so far without the intervention of a computer...I wish that I could pull that thing out by the roots, but I know that's impossible...
Old Dude: Thanks...that's just the conclusion that I reached...I went out at lunch to get some gas, and the TPS now said that all my tires were low...I checked them, and they were spot on, so I'll try the pressure bump to see what happens...
D&D: My thoughts exactly ...I'm having thoughts of that thing deciding to do it's HAL 9000 act in the kink on the back straight at Mid-Ohio
Poser: Here's hoping that it doesn't come back for you!
DaveN007: In all likelyhood you are correct; it's probably something that I did wrong...
__________________
27 year PCA Member
Reformed Club Racer
PCA DE Instructor
This is where there is too much technology and the user blames him/herself because they think they did something wrong, whereas the fact is, it's the system.
I wish there's the option to delete the TPMS. Sounds like too much trouble for its worth.
TPMS
TPMS - The Tire Pressure Monitoring System provides early warning of any drop in pressure by continuously monitoring the pressure in each tire and alerting you in the onboard computer display in the event of a pressure deficiency. It communicates the exact pressure of each tire and/or their deviation from ideal pressure. This does away with the need for regular air pressure checks at the service station, which often prove highly inconvenient.
TPMS is not meant to be accurate.
it will warn you with catastrophic pressure loss, but if you think it's going to be accurate to the psi, you are wrong. get a good, high end tire pressure gauge from longacre.
PIWIS - Porsche Integrated Workshop Information System
Porsche Integrated Workshop Information System (diagnostic tester) This device is used to test various aspects of your Cayman's computer and electronic systems. These units cost over $12,000 to purchase and are connected to Porsche via a wireless connection at the dealership so that your Cayman's information can be sent to Porsche whenever your car is attached for diagnosis. The PIWIS device has the ability to control almost any system in your car provided that your car has the appropriate control units and programming installed. Your dealership may not perform some activities such as disabling safety equipment.
TPMS
TPMS - The Tire Pressure Monitoring System provides early warning of any drop in pressure by continuously monitoring the pressure in each tire and alerting you in the onboard computer display in the event of a pressure deficiency. It communicates the exact pressure of each tire and/or their deviation from ideal pressure. This does away with the need for regular air pressure checks at the service station, which often prove highly inconvenient.
Recognizing how the system works is the first thing, but TPMS appears to be a problem prone technology. My tires would always read 2-3 lbs lower than actual on the dash display. Perfectly normal. At 12,000 mi. my left rear, properly inflated, began to read low (as little as 13lb) when cold, would increase rapidly while driving ( to as high as 60 lb.). I suspected a bad sending unit, but now the left front (inflated to 29 lb this AM) is showing -4 lb., gauge shows 31. Could be another sending unit, or worse, the recieving unit. My nearest dealer is four hours away, so I am waiting until I can take a 2-3 day vacation to see about repair. To be fair the TPMS has properly alerted me to a low or flat tire on two occasions, so it has real value.
TPMS
TPMS - The Tire Pressure Monitoring System provides early warning of any drop in pressure by continuously monitoring the pressure in each tire and alerting you in the onboard computer display in the event of a pressure deficiency. It communicates the exact pressure of each tire and/or their deviation from ideal pressure. This does away with the need for regular air pressure checks at the service station, which often prove highly inconvenient.
TPMS is not meant to be accurate.
it will warn you with catastrophic pressure loss, but if you think it's going to be accurate to the psi, you are wrong. get a good, high end tire pressure gauge from longacre.
PIWIS - Porsche Integrated Workshop Information System
Porsche Integrated Workshop Information System (diagnostic tester) This device is used to test various aspects of your Cayman's computer and electronic systems. These units cost over $12,000 to purchase and are connected to Porsche via a wireless connection at the dealership so that your Cayman's information can be sent to Porsche whenever your car is attached for diagnosis. The PIWIS device has the ability to control almost any system in your car provided that your car has the appropriate control units and programming installed. Your dealership may not perform some activities such as disabling safety equipment.
TPMS
TPMS - The Tire Pressure Monitoring System provides early warning of any drop in pressure by contin
...I'm having thoughts of that thing deciding to do it's HAL 9000 act in the kink on the back straight at Mid-Ohio 
