Audi Q7 2013–2014 — technical service bulletin
Bulletin 01146520355194 · NHTSA communication 10228395 · issued Feb 4, 2014
Technical service bulletin
communication type
Electrical System
component
2013–2014
model years
2
vehicle entries
Official summary
The leak detection pump (LDP) is a vacuum-driven, ECM-controlled, diaphragm pump. In order for the LDP to operate, the engine must be running and vacuum must be applied to the vacuum switch on the LDP. The LDP pressurizes the EVAP system and monitors any pressure drop within a specified amount of time in order to detect a leak.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.