DTC P04B6: Fuel Fill Door Stuck Closed: Notes

WARNING: This page is about a different variant/trim than selected.

1. -

DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

Trouble symptom:

Even if the fuel lid is closed during refueling, refueling control cannot end (meter indication is also not reset).

Wiring diagram:

Engine Electrical System Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>ENGINE ELECTRICAL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .

NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

Courtesy of SUBARU OF AMERICA, INC.

CHECK DATA MONITOR .
1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor, read the change in values of [Fuel Filler Lid Position] when the fuel lid is opened or closed.
  NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .
  
  Does the value of [Fuel Filler Lid Position] change?
  
  Yes: Even if (DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.
  
  NOTE: In this case, temporary poor contact of connector, temporary open circuit or short circuit to ground in harness may be the cause.
  
  No: Go to 2.
CHECK HARNESS BETWEEN ECM AND FUEL FLAP STATUS SWITCH (OPEN) .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Disconnect the connector from the fuel flap status switch.
4. Measure the resistance of harness between ECM connector and fuel flap status switch connector.
  Connector & terminal
  
  (B134) No. 49 - (R539) No. 2:
  
  Is the resistance less than 1 Ω?
  
  Yes: Go to 3.
  
  No: Repair the harness and connector.
  NOTE:
  In this case, repair the following item:
  - Open circuit in harness between ECM connector and fuel flap status switch connector
  - Poor contact of coupling connector
CHECK HARNESS BETWEEN ECM AND FUEL FLAP STATUS SWITCH (SHORT TO GROUND) .
1. Measure the resistance between the ECM connector and engine ground.
  Connector & terminal
  
  (B134) No. 49 - Engine ground:
  
  Is the resistance 1 MΩ or more?
  
  Yes: Go to 4.
  
  No: Repair the short circuit to ground in harness between ECM connector and fuel flap status switch connector.
CHECK FUEL FLAP STATUS SWITCH .
Check the fuel flap status switch. Ref. to SECURITY AND LOCKS>REMOTE OPENERS>INSPECTION>UNIT INSPECTION>FUEL FLAP STATUS SWITCH .

Is the check result OK?

Yes: Go to 5.

No: Replace the saucer - COMPL. Ref. to SECURITY AND LOCKS>REMOTE OPENERS>REMOVAL>FUEL LID>HYBRID MODEL .

NOTE: Fuel flap status switch cannot be disassembled.
CHECK FUEL FLAP STATUS SWITCH POWER SUPPLY CIRCUIT .
1. Turn the ignition switch to ON.
2. Measure the voltage between the fuel flap status switch connector and chassis ground.
  Connector & terminal
  
  (R539) No. 1 (+) - Chassis ground (-):
  
  Is the voltage 10 V or more?
  
  Yes: Repair the poor contact of ECM connector.
  
  No: Repair the harness and connector.
  NOTE:
  In this case, repair the following item:
  - Open or short to ground in harness of power supply circuit
  - Poor contact of coupling connector
  - Blown out of fuse