Tire Monitor - Erroneous Low Tire Pressure Warning
44 Tire pressure warning when tire pressure is correct
44 09 10
2020946/1
December 8, 2009
157
Affected Vehicles
Condition
The "Tire pressure too low" warning is illuminated in the IP cluster, but the tire pressure is correct.
Technical Background
The wheels or tires may have been changed or replaced recently.
Production Solution
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Service
1. Using the Vehicle Self Diagnosis function of the 5051B, access address word 65 (Tire Pressure Monitoring). Sensor IDs that are learned to the
vehicle are stored in Measured Value Blocks 40, 41 and 42.
2. Record the tire pressure sensor IDs shown in MVB 40, 41 and 42 by saving them in the diagnostic log. This will enable you to attach it to the
TAC ticket, if needed.
Tip: If the customer uses only one set of wheels and tires, there should be four sensor IDs listed in MVBs 40, 41 and 42. If the customer uses more
than one set of wheels and tires, there may be as many as eight sensor IDs stored.
3. Ensure there are no spare sensors (for example, a loose sensor on a tool cart from a previous repair) within a few feet of the location you are
testing.
Tip: If the tested sensor is no longer broadcasting a signal, the tester may read a nearby sensor.
4. Ensure the BRT-DBL4 is set to display the sensor ID in decimal form. (To do this, from the Main Menu, select Settings. Under the TPM ID:
option, be sure Dec is selected.)
5. Using the BRT-DBL4 tire pressure sensor tester, choose menu options Audi Vehicles >> All Models >> R8 and 2008+. The tester should then
display the part number that is expected to be installed on the vehicle.
6. Hold the tester within two inches of a valve stem and press the TEST button. The tester screen will display the ID number of the sensor installed
to the interior side of that valve stem.
7. Test all four locations.
8. Compare the sensor IDs displayed by the BRT-DBL4 to those stored in MVBs 40, 41 and 42.
^ If an ID displayed by the BRT-DBL4 has not been stored in MVBs 40, 41 and 42, the TPMS module has not learned that sensor to the vehicle.
Follow the directions in Guided Fault Finding to perform a sensor adaptation.
^ If the installed sensors match MVBs 40, 41 and 42, further diagnosis is required. Follow the Guided Fault Finding test plan.
9. Be sure the tires are properly inflated prior to returning the vehicle to the customer. Consult the tire pressure label on the B-pillar or the Owner's
Manual for appropriate tire pressures.
If a BRT-DBL4 is not available
It is possible to learn what sensors are installed on the vehicle by viewing MVB 16. MVB 16 displays the ID of the sensor that was most recently
triggered.
1. View MVB 16 while triggering each sensor using the VAS 6287 or by letting a small amount of air out of each tire.
2. Be sure the tires are properly inflated prior to returning the vehicle to the customer. Consult the tire pressure label on the B-pillar or the Owner's
Manual for appropriate tire pressures.
Warranty
This TSB is informational only and not applicable to any Audi warranty.
158
Required Parts and Tools
BRT-DBL4 Tire Pressure Sensor Tester
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service
manuals for the latest information.
