Fuel Tank Lock Switch F314 , checking

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2008 Audi S4, 2008 Audi RS 4, 2008 Audi A4, 2007 Audi S4, and 2007 Audi RS 4. However, it is still accessible from the selected car via links, so may be relevant.

The Fuel Tank Lock Switch F314 consists of a reed contact on fuel filler tube and a fuel tank cap with an embedded magnet. If fuel tank cap is not fully screwed on, the reed contact switches on an indicator in instrument cluster.

Special tools, testers and auxiliary items required

Fig 1: Portable Multimeter V.A.G 1526C

GW00000696

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Portable multimeter V.A.G 1526 C

Fig 2: Identifying Connector Test Set V.A.G 1594 C

GW00000525

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connector test set V.A.G 1594 C

If indicator is lit, check the following points in order:

Fuel tank cap is completely screwed on.
Correct fuel tank cap (Identification: Threads are gray in color).

Fig 3: Identifying Switch At Fuel Filler Tube Is Fully Inserted

GW00018575

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Switch - arrow - at fuel filler tube is fully inserted.
Electrical malfunction in switch.
Wiring connection to instrument cluster is faulty (check according to schematics).

Fuel Tank Lock Switch F314 , checking electrical

Remove rear seat bench →
- 72 - SEAT - FRAMES
- 72 - SEAT - FRAMES for BODY INTERIOR - CABRIOLET
.

Fig 4: Removing Cover Bolts For Locking Flange

GW00014428

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Unbolt cover for right locking flange - arrows -.

Fig 5: Identifying Right Locking Flange Electrical Harness Connectors

GW00018595

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect electrical connector - 2 -.

NOTE:

Ignore - 1 -.

Fig 6: Connecting Hand Multimeter V.A.G 1526 B Between Terminal For Resistance Measurement

GW00018563

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect hand multimeter V.A.G 1526 between terminal - 1 - and - 2 - for resistance measurement.

Fuel tank cap	Specified value
Screwed on tight	Less than 1 Ω
Not or incorrectly screwed on	∞ Ω

If specifications are not obtained:

Remove right rear wheel housing liner →
- 66 EXTERIOR EQUIPMENT
- 66 - EXTERIOR EQUIPMENT for BODY EXTERIOR - CABRIOLET
.

Fig 7: Identifying Switch At Fuel Filler Tube Is Fully Inserted

GW00018575

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Replace Fuel Tank Lock Switch F314 - arrow - , thereby unclipping and clipping in the switch and electrical wiring at fuel filler tube.