What tire pressure for 1993 mecury sable....nothing in book or door,....low tire just don't want to over inflate

because it is a low profile tire with a wide tread , the 30 psi is a recommended pressure for a standard size tire
however at 30 psi you will probably find that it will wear with an under inflated wear pattern and the 40 psi is used to sit the tread flat on the road
best talk with a good tire shop as they have experience and reports form a vast range of customers who talk about the pressures they run to get the best wear from the tires
the tires I run are standard and the recommended pressure is 32 psi but the make of tire actually runs best on 38 psi and that comes from the tire manufacturer

Its the low tire light. On the drivers side door opening you should be able to find a sticker that tells you the proper tire inflation for you vehicle. Check all four tires to make sure they are properly inflated. If that tire is low it probably indicates there is a leak. Once all four tires are inflated drive the vehicle on the freeway for about ten minutes. the light should go out. If the light comes back on and the same tire is low than there is definitely a leak.

If all the tires are properly inflated and the light comes on there may be a problem with the sensor in that wheel. A TPMS scanner will be needed to see what the sensors are displaying for pressure.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Hi, if you see this TPMS icon illuminated, it means your vehicle has a low tire. STOP, and check the inflation pressure in your tires. This warning light will come on if tire pressure in any of your tires falls more than 25% below the recommended inflation pressure (refer to your owners manual, or the tire inflation decal in the glovebox, driver door pillar or gas tank filler cap lid for tire inflation pressure recommendations).
The TPMS warning light should come on for about one second when the ignition key is first turned on for a bulb check. It should then go out if all of the tires are properly inflated. If it does not go out, or it comes on while driving, you have a low tire.
If the TPMS warning light is flashing, it indicates a fault has been detected in the TPMS system that will require further diagnosis. Common faults include a bad tire pressure sensor, a defective keyless entry receiver module, a fault in the TPMS or body control module (BCM), or wiring problems in the keyless entry/TPMS/BCM circuit.

There should be a sticker or placard on the driver's door jamb that has the tire size and inflation pressures.

Hello Mattingly.

Here is some information for you regarding your problem.

The Tire Inflation Monitor (TIM) system alerts the driver when the pressure changes in one of the tires. The system only detects a low pressure condition while the vehicle is being driven. Once a low tire pressure condition is detected, the system informs the driver that a low tire pressure condition exist's, whenever the ignition is ON.
The LOW TIRE message appears on the Instrument panel if the tire pressure in one tire becomes at least 82 kPa (12 psi) lower or higher than the other three tires. The message does not appear if more than one tire is low or high, or if the system is not calibrated properly. The system does not inform the driver which tire is low. To clear this message, set the tire pressures in all four tires to the proper pressures and perform the system reset procedure. Refer to Tire Inflation Monitor Reset Procedure for service procedure.
The Tire Inflation Monitor software requires approximately one half hour of straight line driving to complete the TIM autolearn. There are several speed ranges that the EBCM needs to learn the tire inflation configuration in order to have the full capability of detecting a low tire condition. The speed detection ranges are the following:

• 24-64 km/h (15-40 mph)
• 64-113 km/h (40-70 mph)
• 113-145 km/h (70-90 mph)

Each speed range has 2 modes of low tire detection.

• Monitor Mode 1
• Monitor Mode 2 The EBCM learns the tire inflation configuration for each speed range independently. In Monitor Mode 1, the EBCM has only partially learned the tire inflation configuration for the speed range and has limited detection capability for a low tire condition. In Monitor Mode 2, the EBCM has fully learned the tire inflation configuration for the speed range and has full detection capability for a low tire condition. If the EBCM is not in Monitor Mode 1 or Monitor Mode 2, a low tire condition cannot be detected because the EBCM has not learned the tire inflation configuration of the vehicle.

To reset (calibrate) the system:
Turn the ignition switch to RUN. Then press and hold the RESET button for about five seconds. The red RESET button is located inside the instrument panel fuse block on the right side of the dash.. The LOW TIRE light will come on and flash three times and then it will turn off.
The system completes the calibration process during driving.
The system normally takes 15 to 20 minutes of driving in each of three speed ranges to "learn" tire pressures. The speed rages are 15 to 40 mph (25 to 65 km/h), 40 to 65 mph (65 to 105 km/h) and above 65 mph (105 km/h).

There you are, this should fix you up.
Keep in mind this system uses wheel speed sensors to calculate. If one of your sensors isn't working your low tire light will remain on.

Thank you for using FixYa.

KL

the TPMS light is the low tire warning light (Tire Pressure Monitoring System). Inside the drivers front door there will be a sticker that tells you what the tires should be inflated to. Check all the tires and make sure they are properly inflated. This should be done when the tires are cold.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

This normally will do it by itself sometimes you have to use a tool for tire sensor but I would make them all the correct pressure by the sticker on drivers side door and drive it then it should register it if not You will need to have a tire shop run the tool on it probably only 10 bucks to have done

Hello. Welcome to FixYa. Please allow us to assist you.

The ( ! ) symbol is the Low TIre Pressure Warning light. This light comes on when the a tire (or combination of tires) has insufficient inflation pressure.

When the ( ! ) light comes on, you need to get all of the tire inflations checked, and air added if the pressures are low. The proper pressure for your vehicle are on a sticker inside the metal pillar that is on the driver's side front door area.

Thanks for choosing FixYa for assistance today.

That is the TPMS (tire pressure monitoring system) warning light. It is letting you know that one or more of the tires is low on tire pressure. The correct tire inflation for the vehicle is located on a sticker inside the drivers front door. Make sure all four tires are inflated to that pressure.

If there all low I would bet you live in a cold weather environment. It is normal for tire pressure to drop as temperatures drop.

If one tire is low than it is probably leaking and should be checked for a repair.

Once the tire pressures have been corrected the vehicle will need to be driven for approximately 10 minutes at sustained speeds of more than 15mph.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Tire Inflation Pressure Monitor Systems (TPMS) are being used on more and more new vehicles. Low tires are potentially dangerous, especially if a vehicle is heavily loaded and traveling at highway speeds during hot weather. A low tire under these conditions is a blowout waiting to happen. The inflation pressure of the tires should be checked regularly, but many motorist do not check their tires. That is why Tire Pressure Monitor Systems are coming into use.

Tires are designed to operate within a certain pressure range. The recommended inflation pressure can usually be found in the vehicle owner's manual and on a decal that may be located in the glove box or door jam. The recommended inflation pressure is designed to give the best combination of ride comfort, load carrying capacity and rolling resistance.




Hope help with this.