Tank Leak Diagnosis System, Vehicles From My 2013
WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2017 Audi SQ5, 2017 Audi Q5, 2016 Audi SQ5, 2016 Audi Q5, and 2015 Audi SQ5. However, it is still accessible from the selected car via links, so may be relevant.
- The function of the leak detection system is based on the premise that the fuel systems creates a natural vacuum when the fuel in the fuel tank becomes colder.
- The Fuel Tank Pressure Sensor -G400- -3- senses the vacuum in the bleed line -1- near the EVAP canister -2-. The Fuel Tank Leak Detection Control Module -J909- -7- is attached directly to the wall of the fuel tank -6- and monitors the temperature inside the fuel tank. The system is considered to be closed if the measured vacuum is 2.5 mbar (0.036 psi).
- There is a leak in the fuel system if there is not vacuum, which will result as an entry in the control module Diagnostic Trouble Code (DTC) memory.
4 - Bleed Line to the Engine
5 - Signal Wire to the Engine Control Module -J623-