DTC P04B5: Fuel Fill Door Stuck Open: 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).
"Close the fuel lid" is displayed on the meter during driving even though the fuel lid is closed.

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 short circuit in the harness or driving with the fuel lid left open may be the cause.
  
  No: Go to 2.
CHECK HARNESS BETWEEN ECM AND FUEL FLAP STATUS SWITCH (SHORT TO POWER SUPPLY) .
1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Disconnect the connector from the fuel flap status switch.
4. Turn the ignition switch to ON.
5. Measure the voltage between ECM connector and engine ground with the fuel lid closed. Connector & terminal
  (B134) No. 49 (+) - Engine ground (-):
  
  Is the voltage 1 V or more?
  
  Yes: Repair the short circuit to power supply in harness between ECM connector and fuel flap status switch connector.
  
  No: Go to 3.
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: Repair the poor contact of ECM connector.

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.