TPMS Tools: Servicing VW Tire Pressure Monitoring Systems

TPMS Tools: Servicing VW Tire Pressure Monitoring Systems

Understanding VW TPMS is the first step to efficient diagnosis and service.

Volkswagen tire pressure monitoring systems (TPMS) can be some of the easiest to reset and relearn. But, VW TPMS relearns can also be some of the most time-consuming if you don’t follow the procedures or don’t realize why specific steps are essential. 

Tip #1: Use a TPMS Tool 

Use a TPMS tool that can interface with the vehicle using the OBD II connection. Yes, it is possible to relearn sensor positions using button pushes in the driver information center and to navigate menus, but most dedicated TPMS tools can do it faster with fewer errors. Also, for most models, you will need a TPMS tool to program new sensors to the vehicle. 

Tip #2: Set the Correct Tire Pressures 

Before any relearn or reset procedure is performed on a direct or indirect system using either a tool or vehicle menus, set the tires to the correct pressure. When the system is reset, VWs use this pressure as the reference pressure. If it is not accurate, the system might assume an incorrect pressure is the correct pressure. 

Tip #3: Check the Second Set for Snow Tires 

Some VW models allow for a second set of IDs to be stored in the system for snow tires. Typically, these can be found on higher-end models like the Passat, Tiguan and R32/Golf R. 

Tip #4: Understand Sensor Operations 

The most important operational aspect to remember is how and when the VW TPMS sensors transmit. All TPMS sensors have a tiny accelerometer to sense when the wheels are moving. The movement has to reach a specific threshold of g-force or speed, for the sensor to start transmitting. The speed for most VWs is 16 mph. This is why a quick test drive is critical. Some VWs need to be driven at 16 mph to relearn the sensor IDs. It’s really a good practice no matter the make. 

When the wheel stops moving, it takes a specific amount of time for the sensor to stop transmitting. Depending on the make and model, it could be five to 20 minutes. For some VWs, it might take 20 minutes of just being stationary. 

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You can’t see or hear the waves of electromagnetic radiation, that transmit everything from television shows to tire pressure information, traveling through the air. It is like magic how these radio waves work. So, how do you diagnose a radio wave? This has been a question asked by many technicians trying to resolve TPMS and keyless entry problems.You can see the results of a radio wave using a scan tool by looking at the data stream when observing key fob button presses or codes being set by a missing TPMS sensor signal. But, how do you diagnose what happens between the transmitter and receiver if a signal is not sent or received? There are a couple of approaches and tools you can use.A dedicated TPMS tool can force a sensor to transmit by emitting a transmission signal around 125Hz or above. You can also observe the data and information on the tool. Also, you can purchase probes for your scope that can sense radio waves. But, how do you learn about radio waves?

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