Check Ground (GND) activation

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2004 Audi A6, 2003 Audi S6, 2003 Audi A6, 2002 Audi S6, and 2002 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.

Connect multimeter for voltage measurement as follows:

Fig 1: Identifying EVAP Canister Purge Regulator Valve Harness Connector Terminals

Courtesy of AUDI OF AMERICA, INC.

EVAP CANISTER PURGE REGULATOR VALVE CIRCUIT TEST: TERMINAL 2

Harness connector Terminal	Measure to
2	B+

Operate starter briefly.
- Specified value: approx. battery voltage
Switch ignition off.

If specified value is not obtained:

Connect test box to wiring harness of Engine Control Module (ECM). See TEST BOX, CONNECTING FOR WIRING AND COMPONENT TEST ; ECM is not connected.

Check the following wire connection for open circuit according to wiring diagram:

Fig 2: Identifying EVAP Canister Purge Regulator Valve Harness Connector Terminals

Courtesy of AUDI OF AMERICA, INC.

EVAP CANISTER PURGE REGULATOR VALVE CIRCUIT TEST: TERMINAL 2 & TEST BOX SOCKET 64

Harness connector Terminal	Test box Socket
2	64

Specified value: Wire resistance max 1.5 Ω

Also check the wire for short circuit to B+ and Ground (GND).
- Specified value: infinity Ω (no continuity)
If necessary, repair wire connection.

If no malfunctions are found in wires:

Replace Engine Control Module (ECM).