Pinpoint Test M : The Fuel Filler Door Lock Is Inoperative

WARNING: This page is about a different car, the 2018 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.

M1 CHECK THE POWER DRIVER DOOR LOCK OPERATION
- Ignition OFF.
- Press the lock and unlock button on the door lock control switch while observing the driver door lock operation.
Does the driver door lock operate correctly?

Yes GO to M2

No GO to Pinpoint Test I

M2 CHECK THE LOCK CIRCUIT FOR AN OPEN

NOTE: The following step uses a test lamp to simulate normal circuit loads. Use only a Rotunda Test Lamp (SGT27000) or 250-300mA incandescent bulb test lamp. To avoid connector terminal damage, use the Rotunda Flex Probe kit for the test lamp probe connection to the vehicle. Do not use the test lamp probe directly on any connector.

Disconnect Fuel Filler Door Latch C409 .

Connect:

Positive Lead	Measurement / Action	Negative Lead
C409-1	Courtesy of FORD MOTOR COMPANY	Ground

NOTE: The BCM only supplies voltage to the actuator momentarily. It is important to monitor the test lamp while pressing the door lock control switch.

While pressing the door lock control switch in the lock position, monitor the test lamp.

Does the test lamp momentarily illuminate?

Yes

GO to M3

No	REPAIR the circuit.

M3 CHECK THE UNLOCK CIRCUIT FOR AN OPEN

Connect:

Positive Lead	Measurement / Action	Negative Lead
C409-2	Courtesy of FORD MOTOR COMPANY	Ground

NOTE: The BCM only supplies voltage to the actuator momentarily. It is important to monitor the test lamp while pressing the door lock control switch.

While pressing the door lock control switch in the unlock position, monitor the test lamp.

Does the test lamp momentarily illuminate?

Yes	INSTALL a new fuel filler door latch.

No	REPAIR the circuit.