TPMS Sensors Topic is solved

[ggleavitt]

To avoid further guessing and since I'm the original poster, I'll re-paste the VIDA verbiage that was in the Swedespeed link in subpost #3 and note the issue as SOLVED:

The [TMPS] system covers the upper electronic module (UEM) (4/70) and the sensors in the wheels. The sensors in the wheels are activated when the vehicle exceeds 40 km/h (25 mph). The sensors then start to transmit data messages approximately once per minute, which are received by the remote control receiver in the Upper electronic module (UEM). These messages contain the sensor's ID number and air pressure in the tire where the sensor is mounted.

The frequency used by sensors to transmit is the same for all sensors. Thus, the control module can receive signals also from other vehicles with the same system installed. However, the ID-number in each sensor is unique.

Sensors installed on your own vehicle can be retrieved by a statistical selection in the Upper Electronic Module (UEM). When the ignition is turned on the Upper Electronic Module (UEM) starts to listen for messages from the sensors. The control module registers the ID-numbers contained in the received messages transmitted by the sensors, both from own and from other vehicles.

All ID-numbers are added in a list in the internal memory by the Upper Electronic Module (UEM). For each received ID-number, the number of times it has been received is also saved. As the quantity of received ID-numbers increases, an assessment takes place of which ID-numbers have been received most times. The four ID-numbers that have been received most often get the highest "ranking" and are then considered to belong to the own vehicle. In this way any ID-numbers that may have been received from other vehicles with the same type of system, e.g., driving in the adjacent lane, are separated. This assessment takes approx. 5 minutes if the Upper Electronic Module (UEM) is empty of data.

If the evaluation has been carried out, the sensors that are assumed to belong to the actual vehicle are stored in the control module. The information remains between each driving cycle. In this case, it is sufficient for the control module to receive a message from each sensor with corresponding ID number to complete evaluation.
In Upper Electronic Module (UEM), there are tables programmed with the recommended air pressure for this specific vehicle model. This information about air pressure in tires included in messages from sensors is compared to programmed values in Upper Electronic Module (UEM).

If the pressure reported from a sensor differs more than 22% from the recommended value, a warning message will be shown in the Driver information module (DIM).
There are two warning levels that generate different warning messages, one warning for low pressure and one warning for no pressure. A message will also be shown is a sensor should stop transmitting or should receive too low battery voltage.

To reset a warning it is easiest to stop the vehicle and fill air in the tire where the air pressure is low. In order for the warning to reset air has to be filled so that the air pressure reaches a level that corresponds to at least 95% of the recommended air pressure, and then drive the vehicle faster than 40 km/h (25 mph) for more than 10 minutes, accumulated time.

[chitownV]

Without copying and pasting, but from personal experience, like I already said. In plain terms...

It does that and it’s more of a how frequent and consistent the ID #s are over time. I was getting IDs from other cars when I was driving and looking at VIDA. As long as the dash light turns off, then you are good.

The guys at the shop are selling, lol. Maybe they are better for them as they have the 2 common frequencies. But I it sounds like it will be good enough for your ownership of the XC90.

You can also read the VIDA information online here:
https://workshop-manuals.com/volvo/xc90 ... nd_repair/

For everyone, if you want to directly access VIDA documents online, go here and scroll down to the XC90 models. No need to clutter the threads with copy & paste. You don't have to be special to access the documents, it's open to everyone.
https://workshop-manuals.com/volvo/

[xHeart]

To avoid further guessing and since I'm the original poster, I'll re-paste the VIDA verbiage that was in the Swedespeed link in subpost #3 and note the issue as SOLVED:

The TPMS Sensor is like the tail that wags the dog -- a small or unimportant part of something is becoming too important and is controlling the whole thing; hence my situation.

SOLVED, it is but...

After capturing the TPMS data, I went back a day later to learn from the UEM frozen data; if any. Which then lead me to a DTC with yellow dot - I'll share the DTC later. The DTC description highlights the issue may have been caused by the uneven tire; varying tread-depth... so I checked each tire manually with my $2 gauge. The sensor(s) are reporting correctly. Is this ABS or HALDEX or some other sensor; certainly not TPMS?

Sensors are becoming eyes and ears of this DIYer. Now contemplating, a complete wheel upgrade; here is a work in process.

Stock setup:
Thalia rim size: 18" x 7.5"
bolt pattern: 5x108
wheel offset: +49
hub bore: 67.1
tire size: 235/60R18
OE tpms: 315Mhz

Possible upgrade:
AFT rim size: 20" x 8.5"
bolt pattern: 5x108 (use conical tuner lug bolt)
wheel offset: +35 (matches stock setup with the backspace 6.18")
hub bore: wheel 73.1 -> hub 67.1 (use hub-centric ring)
Purple Maxx tpms sensor: 315mHz, Snap-in rubber -- pre-programed for year make and model, comes with TPMS ID
Ceramic Coating: weather, salt, and UV resistance, 4-5 year life
Continental ContiCrossContact LX25: 265/45R20/XL

[chitownV]

That reminds me I need to rotate my tires, lol.

That tread depth, or rotation, would be read by the ABS sensors. When it comes to an ABS related code, first steps are to inspect for dirt/crud/iron that can accumulate on the ABS sensor itself and inspect the ABS ring for any dirt or broken teeth. You can unscrew the holding screw to ABS sensors and inspect/clean.

Slight differences in tread depth, of the same type of tire, shouldn’t throw a code, so you are in the right direction of exploring why it’s reading different rotations beyond what’s normal allowance.

[xHeart]

That reminds me I need to rotate my tires, lol.

That tread depth, or rotation, would be read by the ABS sensors. When it comes to an ABS related code, first steps are to inspect for dirt/crud/iron that can accumulate on the ABS sensor itself and inspect the ABS ring for any dirt or broken teeth. You can unscrew the holding screw to ABS sensors and inspect/clean.

Slight differences in tread depth, of the same type of tire, shouldn’t throw a code, so you are in the right direction of exploring why it’s reading different rotations beyond what’s normal allowance.

It makes sense that the ABS sensor is reporting; here is the DTC and description > DEM-P163568 Tire/Axle Out of Acceptable Range. Algorithm Based Failures

If I upgrade to a new set; it would lower # of tire revolution per mile from 693 to 686. Could this new 686 revs per mile be updated via VIDA/DiCE? Or is it something ABS will learn?

Underbar helg i prognosen.

[lntravler]

I installed two no brand TPMS sensors on my two snow tires. I used vida dice to save it on car computer. The warning sign went off couple days, then came back.

Then I drove with warning light on. Unfortunately one tire hit nails last month and another last week. Both are damaged after driving flat.

I believe aftermarket parts are ok but at least with good brand names. Lessons learned.