Secondary Air Injection (AIR) valve, checking: Notes

WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 2005 Volkswagen GTI, 2004 Volkswagen R32, 2004 Volkswagen Jetta, 2004 Volkswagen GTI, and 2003 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Solenoid valve is closed when no voltage is present.

Recommended special tools and equipment

V.A.G 1526 multimeter or V.A.G 1715 multimeter
V.A.G 1594 connector test kit
Wiring diagram

Test requirements

Fig 1: Identifying Main Fuse Panel

Courtesy of VOLKSWAGEN UNITED STATES, INC.

The respective fuses of Secondary Air Injection (AIR) Solenoid Valve -N112- must be OK:

Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations

Ground (GND) connections between engine and chassis must be OK.
Ignition switched off.

Test sequence

Vehicles with engine code AFP

Fig 2: 2-Pin Connector At Secondary Air Injection Solenoid Valve -N112- (Vehicles With Engine Code AFP)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect 2-pin connector from Secondary Air Injection (AIR) Solenoid Valve -N112- (arrow).

Vehicles with engine codes BDF and BJS

Fig 3: 2-Pin Connector At Secondary Air Injection Solenoid Valve -N112- (Vehicles With Engine Code BDF And BJS)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect 2-pin connector from Secondary Air Injection (AIR) Solenoid Valve -N112- (arrow).

Continuation for all vehicles

Fig 4: Checking Resistance Between Terminals Of Solenoid Valve

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Check resistance between terminals of solenoid valve.

Specified value: 25.0 to 35.0 Ω

If specified value is not obtained:

Replace Secondary Air Injection (AIR) Solenoid Valve -N112-:

Vehicles with engine code AFP. Refer to Parts of Secondary Air Injection (AIR) system (vehicles with engine code AFP), removing and installing , item 5
Vehicles with engine code BDF. Refer to Parts of Secondary Air Injection (AIR) system (vehicles with engine code BDF), removing and installing , item 25
Vehicles with engine code BJS. Refer to Parts of Secondary Air Injection (AIR) system (vehicles with engine code BJS), removing and installing , item 25

Erase DTC memory of Engine Control Module (ECM). Refer to Diagnostic mode 4: Reset/erase diagnostic data
Generate readiness code. Refer to Readiness code, generating

If specified value is obtained:

Check wires to control module according to wiring diagram. Refer to Check wires to control module .