I would like to know if anybody is having any problems with this? It's a pain in the neck.

 

Are all US-versions equipped with this feature? I don't have such a light. And it's not mentioned in the manual.

How does it work? Do you have sensors in the rims?

Thanks

 

Yes it's standard on Limited and SRT 6 but not available on the base. When it detects i think a 20% pressure drop from the standard air pressure setting for any tire front or back, a yellow light comes on in the left side of your instrument cluster with a picture denoting low tire pressure. However the system is pretty lame as opposed to that of the 350Z which tells you the tire pressure for front and rear in digital readouts, ours only lights up this weird symbol that's supposed to look like a tire with low pressure and then you have to go out and inspect each tire to see which one is not inflated properly.

The sensors are mounted inside each rim and are of fragile plastic. Maybe you hit a large bump and one came loose and the light is coming on. If it goes out for a while then comes on, you might have a small leak on a tire from a nail or etc... Also make sure you're checking your tire pressure when cold not when warm. Warm tires expanding give you higher readings and if you're reducing air pressure when warm, then when the tire gets cool and drops in air pressure you'll be below the factory setting for the TPM system and the light will come on.

 

I had this happen when the temperatures started getting cool in the mornings. I checked the pressures and they were all low (~26 psi). I filled them up to 32 in front and 33 in the rear and haven't seen the light come on again.

The pressure sensors are part of the valve stem (on the '04 coupe stock wheels). If the pressure is correct and you still are getting the light, your dealer can plug in to the OBD-II port and determine which one is bad.

 

This happened to me as soon as the weather dropped too. I am still tinkering with air pressure. The light goes on and off so I assume I am close. I'll have to check them with another gauge.

 

Thanks for the info. I have the one that is called Limited in US but no sensors and no light.
First I thought yours is that kind of system that works with the traction control. If a tire goes flat (less than 80%) it turns quicker and the system shows 'air pressure'. But if you say that you have sensors inside ...?... Strange the didn't equip with real pressure display.
How do you do when you change the wheels? Like summer/winter? Do you put new sensors or simply swap them?

Thanks

 

Happened to me too. When it gets colder the air pressure in the tire drops. I took me two trips to the gas station last time to get it right. I put in 32 in the front, 33 in the back got in the car and the light was still on and sure enough somebody pulls up behind me to check their tires. Being a nice guy I came back later. It is kind of a PIA but I'd rather have it than not.

Pat

 

What I found interesting is that when I just used the little pressure gage on the compressor that comes with the car and set the tire to 32f/33r that the light always went out. It's a lot more convenient than dragging my roll around compressor out of the garage up to the car to air up the tires and I know the little compressor in the trunk works if I need it.

 

Stryfox,

Get yourself a good analog tire gauge, if you don't have one already. The TPMS will register when there is a 25% (8 lbs.) loss of air pressure, this is also cumulative (ex. all 4 tires down 2 lbs. each). The TPMS will not reset until all tires are brought up to the proper pressure. I have found that if you leave your car running (or the key in the ON position) while inflating the tire(s) and turning the car off after inflation and waiting approx. 2 minutes and restart your car the TPMS will rest easier. I have had many problems with the TPMS...cold weather/sudden drop in temp...aftermarket wheels.

 

For chxf - The US version of the Ltd and the SRT have a sensor on each wheel that transmits a signal to a light on the dash when the tire pressure in a particular tire drops a certain amount.
The sensor is a part of the valve stem assembly. The problem I have is figuring out just which tire or was it all the tires that need air. I guess I check all of mine any way but the light on the dash is not tire specific, in other words it doesn't tell you right front is low just that one of the four is low.

Pat

 

I also have this problem but have learned to ignore idiot light as others have. Evidently the TPMS needs to be calibrated by dealer as the tire pressures are fine.

I am told there is a battery in each sensor as well that could be the problem.

 

i used a better gauge and since it has been fine.

 

Yeah I've experiencing this annoying feature right now. Nice to have if it works properly but I checked the tires and they were fine. So now I just ignore it until there is a better explanation.

 

The calibration by the dealer is to let the computer know which TPMS signals are for your car. Each sensor has its own unique ID that it broadcasts. Could you imagine the fun if your car was giving low tire pressure indication because it was receiving the signal from the car next to you?

The procedure involves clearing the computer TPMS memory and then placing a magnetic tool on each sensor to "turn it on" as the computer asks for it. The computer then knows its ID's for the sensors installed on your car.

Yes they have a small non-replaceable battery in each sensor, but to conserve battery life they are activated by a switch that only goes on 1) if the magnetic tool is placed on the valve stem, or 2) if the car is going faster than 20 mph. In another thread the price of about $49 was listed for the cost of the valve stem / sensor. Figure some day you'll be replacing them as the batteries go dead.

 

I have had the low pressure light come on when I started the car. Wasn't moving yet. Put air in the tires and the light went out. You don't have to be going over 20 mph.

 

Makes you wonder how accurate the shop manual is - per the manual:
The tire pressure sensor/transmitter is powered by an internal battery. The battery is not replaceable separately. In
the event of battery failure, the entire tire pressure sensor/transmitter at that wheel will require replacement. To
extend the life of the battery, the sensor/transmitter is not activated until the vehicle reaches a speed of approximately
32 km/h (20 mph) as stated earlier.

Maybe this is why there are so many problems with the service department - something got lost in the translation.