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Titan - Direct vs Indirect

Direct vs Indirect TPMS

Direct TPMS

This type of system uses individual pressure sensors mounted inside each wheel. Each sensor sends its signal to the vehicle via a live, wireless connection. The frequency of the sensors will depend on the vehicle manufacturer and will either be 315 MHz or 433 MHz.

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Advantages

• Fast reaction to changes in tire pressure &#; typically only taking a few seconds.
• Highly accurate &#; measuring to within 1 or 2 psi.
• Will detect a puncture, even after parking.
• Will detect a slow leak.
• Able to identify which tire has pressure issues.

Disadvantages

• Requires maintenance/servicing, using specialized tools and equipment.
• Risk of damage to sensors when tires are removed.
• Not standardized, every manufacturer has their own proprietary TPMS system.
• Need to be reset. Each vehicle manufacturer has a different relearn procedure.

Indirect TPMS

This type of system does not directly measure the pressure in the tire, but uses the ABS sensors on the vehicle to assess the rotational speeds of each wheel. An under-inflated tire will have a slightly different diameter than a fully inflated tire, resulting in that particular wheel having a different rotational speed. This information is then sent to the vehicle&#;s on-board computer, which triggers the TPMS warning light.

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Advantages

• Technology already installed on vehicles.
• Doesn&#;t require servicing or the need for special tools.
• No risk of damage when removing tires.

Disadvantages

• Generally not as accurate as direct sensors.
• Slow to react &#; vehicles often need to be driven for a considerable amount of time before the TPMS warning light comes on.
• A puncture after parking may not be immediately identified.
• Since tires lose pressure naturally, roughly at an equal rate - this can result in all four tires being underinflated, without the warning light coming on at all.
• Some indirect systems do not work well with non-OE replacement tires, requiring specific tires to be installed for the system to work properly.
• Requires re-calibration by the driver every time a vehicle&#;s tire pressure is adjusted or a tire is changed.