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DTC P04B9: Fuel Filler Lid Opener Actuator Switch Circuit Low Input
 
 
 
 
TECHNICAL DESCRIPTION
  • The ECM activates the fuel filler lid 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
  • Power supply mode of electric motor switch is ON.
  • 12V starter battery positive voltage is between 10 and 16.5 volts.
Judgment Criterion
  • Fuel filler lid opener actuator switch terminal voltage is less than 0.1 volt for 2 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Indicates "REFUELING SYSTEM SERVICE REQUIRED" on the information screen in the multi-information display.
  • "READY TO REFUEL" does 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.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Fuel filler lid opener actuator failed.
  • Open or shorted fuel filler lid opener actuator circuit, harness damage or connector damage.
  • ECM failed.
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 of short to ground, open circuit and harness damage in FFDO line between fuel filler lid opener actuator connector and ECM connector.
Is the harness wire in good condition?
Go to Step 3.
Repair the connector(s) or wiring harness. Then go to Step 6.
 
STEP 3. Measure the power supply voltage at fuel filler lid opener actuator harness side connector.
(1) Disconnect the fuel filler lid opener actuator connector and measure at the harness side.
(2) Measure the voltage between terminal power supply line and ground.
  • Voltage should be 12V starter battery positive voltage.
Is 12V starter battery positive voltage (approximately 12 volts) present?
Go to Step 4.
Repair or replace the connector(s), or check and repair the harness of short to ground and open circuit in power supply line between 12V starter battery and fuel filler lid opener actuator connector. Then go to Step 6.
 
STEP 4. Check of harness damage in power supply line between 12V starter battery and fuel filler lid opener actuator connector.
Is the harness wire in good condition?
Go to Step 5.
Repair the connector(s) or wiring harness. Then go to Step 6.
 
STEP 5. 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.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn off the power supply mode of the electric motor switch.
Is DTC P04B9 set?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 6.
The inspection is complete.
 
STEP 6. 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.
(2) After the DTC has been deleted, read the DTC again.
(3) Turn off the power supply mode of the electric motor switch.
Is DTC P04B9 set?
Retry the troubleshooting.
The inspection is complete.