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DTC P04B5: Fuel Filler Lid Stuck Open
 
 
 
 
TECHNICAL DESCRIPTION
  • The ECM activates the fuel filler lid opener actuator by turning the fuel filler lid opener relay ON, and the fuel filler lid opens.
  • The ECM monitors the movement of the fuel filler lid opener actuator rod according to the fuel filler lid opener actuator switch signal.
 
 
DTC SET CONDITIONS
Check Conditions
  • During the refuel control mode after the fuel filler lid opener switch is depressed.
  • After the fuel filler lid opener relay is OFF from ON.
  • 12V starter battery positive voltage is between 10 and 16.5 volts.
Judgment Criteria
  • Even if fuel lid opener relay is turned off, the position of the lid opener actuator is the same position as during relay ON, and the lid position switch voltage is 4 volts or more.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • "READY TO REFUEL" may not disappear when the driver closes the fuel filler lid. "READY TO REFUEL" disappears after about 30 minutes have elapsed or after driving for about 30 seconds.
  • When storing the DTC, "CLOSE FUEL LID" may display in the combination meter.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Failure of the fuel lid opener actuator return spring
  • Improper installation of the fuel filler lid or the fuel filler lid opener actuator
  • Shorted fuel filler lid opener actuator circuit or connector damage.
  • ECM failed.
noteWhen fuel filler lid is opened by fuel filler lid opener relay ON, the DTC may be set if movement of the fuel filler lid opener actuator or the fuel filler lid is disturbed by hand etc.
noteWhen the refuel control mode cannot be canceled even if fuel filler lid is closed*, it can be canceled the refuel control mode by performing the following operations.
*: The related refuel indication on the combination meter does not disappear, the fuel tank solenoid valve does not turn off, or the power of the ECM does not turn off even if the fuel filler lid is closed.
  • Using scan tool (M.U.T.-IIISE), "Forced Refuel control completion" from Special Function screen is executed.
  • 30 minutes passed after the item execution.
  • Drive the vehicle continuously for about 30 seconds.

 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check data list item 213: Fuel Filler Lid Opener Actuator Switch.
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).
(1) Connect scan tool (M.U.T.-IIISE). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) .
(2) Operate the electric motor switch without depressing the brake pedal and turn ON (not READY) the power supply mode of electric motor switch.
(3) Set scan tool (M.U.T.-IIISE) to the data reading mode for item 213, Fuel filler lid opener actuator switch.
  • Output voltage should be between 0.25 and 0.56 volt when the fuel filler lid is closed.
  • Output voltage should be between 4.0 and 5.0 volts when the fuel filler lid is open.
(4) Turn off the power supply mode of the electric motor switch.
Is the switch operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
Go to Step 2.
 
STEP 2. Check the installation state of the fuel filler lid and the fuel filler lid opener actuator.
Refer to GROUP 42A, Fuel Filler Lid - Removal and Installation .
Are the fuel filler lid and the fuel filler lid opener actuator installed correctly?
Go to Step 3.
Repair. Then go to Step 8.
 
STEP 3. Check the fuel filler lid opener actuator.
Refer to GROUP 42A, Fuel Filler Lid - Fuel Filler Lid Inspection .
Are there any abnormalities?
Replace the fuel filler lid opener actuator. Then go to Step 8.
Go to Step 4.
 
STEP 4. Check the fuel filler lid opener relay.
Refer to GROUP 42A, Fuel Filler Lid - On-vehicle Service - Fuel Filler Lid Opener Relay Check .
Is the measured resistance normal?
Go to Step 5.
Replace the fuel filler lid opener relay. Then go to Step 8.
 
STEP 5. Check of short to power supply in FFMR line between ECM connector and fuel filler lid opener relay connector.
Is the harness wire in good condition?
Go to Step 6.
Repair the connector(s) or wiring harness. Then go to Step 8.
 
STEP 6. Check of short to power supply in FFDO line between fuel filler lid opener actuator connector and ECM connector.
Is the harness wire in good condition?
Go to Step 7.
Repair the connector(s) or wiring harness. Then go to Step 8.
 
STEP 7. Replace the fuel filler lid opener actuator switch (integrated in fuel filler lid opener actuator).
(1) Replace the fuel filler lid opener actuator switch (integrated in fuel filler lid opener actuator).
(2) Turn on the power supply mode of the electric motor switch and delete the DTC.
(3) Press the fuel filler lid opener switch.
(4) Read the DTC again.
(5) Turn off the power supply mode of the electric motor switch.
Is DTC P04B5 set?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 8.
The inspection is complete.
 
STEP 8. Using scan tool (M.U.T.-IIISE), read the diagnostic trouble code (DTC).
(1) Turn on the power supply mode of the electric motor switch and delete the DTC.
(2) Press the fuel filler lid opener switch.
(3) Read the DTC again.
(4) Turn off the power supply mode of the electric motor switch.
Is DTC P04B5 set?
Retry the troubleshooting.
The inspection is complete.