Fuel Tank Lock Switch F314 , checking

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 the instrument cluster.

Special tools, testers and auxiliary items required

Fig 1: Identifying Multimeter V.A.G 1526B

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Portable multimeter V.A.G 1526 B

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

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connector test set V.A.G 1594 C

Test sequence

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

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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).
Switch - arrow - at fuel filler tube is fully inserted.
Electrical switch is faulty.

Wiring connection to instrument cluster is faulty (check according to schematics).

Fuel Tank Lock Switch F314 , checking electrical

Sedan:

Remove carpeting in luggage compartment.
Fold forward right rear seat backrest, if necessary.

Wagon:

Remove left 1/3 backrest →
- 72 - SEAT - FRAMES
- 72 - SEAT - FRAMES for BODY INTERIOR - CABRIOLET
.
Remove left side luggage compartment trim and dirt tray →
- 70 - INTERIOR TRIM
- 70 - INTERIOR TRIM for BODY INTERIOR - CABRIOLET
.

All models:

Fig 4: Unbolting Cover For Locking Flange In Luggage Compartment

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Unbolt locking flange cover in luggage compartment - arrows -.

Fig 5: Identifying Locking Flange Electrical Harness Connectors

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

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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

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

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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