Description & Function
WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2005 Audi allroad, 2004 Audi allroad, 2004 Audi A6, 2003 Audi allroad, and 2003 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.
The electric vacuum pump is only installed in vehicles with automatic transmission. It is switched on by Engine Control Module (ECM) depending on intake manifold pressure. Vacuum pump is On Board Diagnostic (OBD) capable. Detected malfunctions are stored in Engine Control Module (ECM) memory. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Testing function of electric vacuum pump via On Board Diagnostic (OBD) must only be performed with engine at standstill.