Schrader Academy



What is TPMS?
Tyre pressure monitoring system (TPMS) is an electronic system for monitoring the air pressure in a vehicle tyre. The system automatically transmits a warning signal to the driver in the event of an under and, in some cases, over–inflated tyre. These systems have been legislated to be progressively installed on all new passenger vehicles in US and EU, similar legislation is being introduced in APAC.
What are benefits of TPMS?
TPMS keeps you safe - Safety studies show that each year an estimated 250,000 vehicle crashes are caused by underinflated tyres, which is nearly 700 crashes a day! TPMS can save your money - Not only underinflated tyres can reduce the life of your tyres, it can also cost you more at the pump! Properly inflated tyres save the typical passenger car 35 litters of fuel, every year. TPMS helps your car perform - Proper tyre pressure improves the way rubber meets the road by optimizing traction, handling, steering, stability, and braking. TPMS reduces CO2 emissions -Properly inflated tyres improve gas mileage. Remember the litters you save will translate to reduced carbon emissions!


TPMS legislation
On Tuesday 10th March 2009 the European Parliament in Strasbourg officially approved a Directive Proposal of the Commission aimed to simplify and change the type approval of motor vehicles in Europe. At the same time this proposal introduces a series of implementing measures imposing mandatory adoption of some proven existing technology including Tyre Pressure Monitoring Systems (and ESP).
As for TPMS introduction dates and technical specification this mandate officially requires that (see article 9.2 of adopted text):
"Vehicles in categories M1 shall be equipped with an accurate Tyre Pressure Monitoring System capable of giving, when necessary, an in-car warning to the driver when a loss of pressure occurs in any tyre, which is in the interests of optimum fuel consumption and road safety. Appropriate limits in the technical specifications shall be set to achieve this, which shall furthermore allow for a technology-neutral and cost-effective approach in the development of accurate Tyre Pressure Monitoring Systems."
As for the introduction dates of TPMS, there is a two-year phase-in schedule starting from November 1st, 2012. Article 13.1 to 13.4 of the adopted text states that all vehicles type approved after this date must install a TPM System. Furthermore, all newly registered vehicles after November 1st, 2014 must have a TPM System.


What is the difference between direct and indirect TPMS?
• Direct TPMS has a sensor installed in the wheel and tyre assembly. This sensor detects actual tyre pressure readings.
• Indirect TPMS does not have a sensor installed in the wheel and tyre assembly. This system detects the low pressure by comparing relative wheel speeds via Anti-lock Brake System (ABS). One of the main drawbacks of indirect system is the inability to read the tyre pressure when the vehicle is not moving.
What is the difference between programmable and OE Replacement TPMS sensors?
OE Replacement sensors are supplied with a single vehicle protocol, while programmable sensors can be programmed using a TPMS programming tool to specific make model year of the vehicle.
What are benefits of universal/programmable sensors?
Universal/programmable sensors are designed to replace the original equipment (OE) sensors in the automotive aftermarket. Main benefits of programmable sensors are:
•    Lower stock volume and costs
•    Simplified part selection, fitment and diagnostics
•    Increased speed of service
•    Reduced lost sales, due to lack of right parts
•    Sensors can be programmed either before or after the wheels are mounted to the vehicle
What is the difference between programming and relearning?
EZ-sensor® as well as other programmable sensors come BLANK and must be programmed to the specific MMY of the vehicle using a compatible TPMS programming tool. The tool programs the sensor with the specific vehicle protocol so that the sensor can communicate with the receiver. After the EZ-sensor® is programmed, it functions the same way as the OE sensor for that specific vehicle.
A vehicle relearn is required any time a NEW sensor ID is introduced to the vehicle or when the tyres are rotated.

Replacing a Sensor/Maintenance

What does TPMS light mean?
Solid light
•  If TPMS light comes on and stays solid, it indicates that one or more tyres have low air pressure. Some vehicles provide a visual indication of each tyre’s pressure and may or may not include the TPMS symbol. During service, the tyres should be inspected and inflated to the recommended pressure.

Flashing light
•    If TPMS light comes on and flashes for 60 - 90 seconds before staying solid, it indicates a system malfunction. During service, a test should be performed to determine the cause of failure and a repair solution must be provided.
Why is it important to change the service kit every time the tyre is removed from the wheel?
Harsh road conditions such as salt, sand, dirt and road grime may cause valve cores and aluminium stems to corrode, causing potential air leaks. Also, time and environmental aspects could cause rubber stems to crack, causing slow air leaks. Changing the service kit is a simple, inexpensive way to ensure that your TPMS services are compliant and may decrease returns!
How do I know what is my recommended tyre pressure?
On your driver’s side door, there is a sticker, called a “placard”, on the front end of the frame. This door placard shows the manufacturer’s recommended tyre pressure for your specific vehicle. A common mistake people make is to fill tyres to the “max air” pressure shown on the sidewall of the tyre, which is incorrect. Your tyres should be filled to the placard pressure mentioned on your door.
How often tyre pressure should be checked?
It is recommended to check tyre pressure once a month. It’s important to check pressure in the morning before driving. This will ensure air in the tyre has not expanded from heat providing the most accurate pressure and temperature readings.