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Drove about 150 miles yesterday on good roads. Put the key in this AM & the TP indicator showed the left rear low. Checked both rears & fronts with my dial tire gauge. All showed PSI at spec. Checked after driving 60 miles this AM. All with-in 1 lb of opposite side. Indicator still goes on at start up. Have a dealer appointment for Monday. Your experiences or thoughts please. Thx.
Old dude, I haven't put many miles on my car yet, but I can't get TP readings anything close to what my pressure gauge reads. I wish the thing weren't even on the car! 987f
__________________ '07 Cayman, Cobalt Blue Metallic; Natural Brown leather; clear sidemarkers; Boxster S wheels; '06 SLK 350; '04 SL 500; '73 246 GT; '72 246 GT
From another post on TPMS "The system itself never really knows what the actual "relative" pressure is - meaning, the differential between outside (ambient) temperature, and pressure inside the tire. The sensor is only INSIDE the tire. When you check the tire pressure the old-fashioned way, with a gauge on the valve stem, you are reading relative pressure - the differential between the pressure in the tire and the pressure outside the tire. The gauge reads zero before you put it on the tire, it does not read 13.5 PSI, which is the absolute air pressure of the atmosphere surrounding the tire." It is meant to be a warning system (and operates pretty much real time according to the supplier- see the files section) not a tool for inflation. Hope that helps. That said it could be a TPMS module or sender problem so let us know.
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.
Mine is always showing the right side to be one or two psi below the left side...I fired up my compressor, and got out my guages...both guages showed the same pressure right and left...I'd like to rip the thing out by the roots...can the PIWIs turn it off?
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.
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27 year PCA Member
Reformed Club Racer
PCA DE Instructor
My TPMS varies from time to time. I use TPMS only as a frame of reference or a general status of the tires. Nothing substitutes for a good quality external tire pressure gauge. It's good to check the tires with an external gauge at every fill up and before any "spirited" driving.
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.
I had a similar issue recently. The TPMS will not agree with the external gauge due to gauge accuracy and what Santa Fe mentioned about Gauge vs. Absolute pressure, etc. I ended up going to about 3-4 psi above spec to get rid of the TPMS error message. I think I went to 36 psi front and 40 psi rear on the external gauge to get the TPMS to read within its 'normal' range.
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.
I have an aftermarket system, Smartire system. The reading I have on the display is the same as my tire gauge. It also will show the tire temp and how many psi the tire is off adjusted for temp.It has worked good and a lot cheaper than trying to retrofit the Porsche system.
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Is that 35mph corner 45, 55 or a ..... corner?
Thx for your input. I've always checked my tires on a regular basis with a gauge,but seeing the indicator light on all the time is a pain in the butt. Will post a follow up after dealer checks it.
Checked this AM, indicator still shows low left rear. Checked all tires with gauge. All at correct PSI. Inflated both rears to 40 PSI & bleed down to 36. Indicator now off. Damn tech head Germans! Still going to dealer on Monday & get their opinion on it.
Might also try the relearning function on the TPMS after you've filled the tires to the correct value. Might resolve the issue (did on mine when I picked it up originally from the dealer -- they checked the tires, weren't low, and did a relearn -- been fine since).
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.
'07 Cayman, Cobalt Blue Metallic; Natural Brown leather; clear sidemarkers; Boxster S wheels; '06 SLK 350; '04 SL 500; '73 246 GT; '72 246 GT
