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DTC P04C1-00: Fuel Fill Door Unlock Control Circuit Low
 
 
 
 
CIRCUIT OPERATION
  • When the fuel filler opener switch turns ON, the ECM connector terminal number 83 sends electricity to the fuel filler lid opener relay connector terminal number 3, and the fuel filler lid opener relay turns ON.
  • MFI relay is built into the IPDM E/R.
  • Power is supplied from the MFI relay to the fuel filler lid opener relay connector terminal number 5.
  • When the fuel lid opener relay turns ON, electrical current is sent from the fuel filler lid opener relay connector terminal number 4 to the fuel filler lid release actuator connector terminal number 1.
 
 
TECHNICAL DESCRIPTION
The ECM turns on the fuel filler lid opener relay and opens the fuel filler lid by driving the fuel filler lid lock release actuator.
 
 
DTC SET CONDITIONS
Check Conditions
  • During the refuel control mode.
  • 12V battery positive voltage is more than 10.0 volts and is less than 16.5 volts.
Judgment Criterion
  • Monitor for the malfunction detection in ECM is detected.
 
 
FAIL-SAFE AND BACKUP FUNCTION
Indicates "REFUELING SYSTEM SERVICE REQUIRED" on the information screen in the multi-information display.
 
 
OBD-II DRIVE CYCLE PATTERN
None.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Fuel filler lid opener relay failed.
  • Shorted fuel filler lid opener relay circuit, harness damage or loose connector contact.
  • ECM failed.
note
  • When the refuel control mode cannot be cancelled even if fuel filler lid is closed*, it can be cancelled 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.
    1. Using scan tool (M.U.T.-III SE), "Forced Refuel control completion" from special function screen is executed.
    2. 30 minutes passed after the item execution.
    3. Drive the vehicle continuously for approximately 30 seconds.
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
1.STEP 1. Using scan tool (M.U.T.-IIISE), perform the actuator test.
Use scan tool (M.U.T.-III SE) to perform the actuator test (Refer to ACTUATOR TEST REFERENCE TABLE).
  • Item number 120: Fuel Filler Door Motor Relay
OK: Fuel filler lid opens
Q: Is the check result normal?
 
2.STEP 2. Check fuel filler lid opener relay itself.
Check fuel filler lid opener relay itself (Refer to BODY EXTERIOR, DOORS, ROOF & VEHICLE SECURITY, Door & Lock – Removal and Installation – Fuel filler Lid – On-vehicle Service FUEL FILLER LID OPENER RELAY CHECK).
Q: Is the check result normal?
Replace the fuel filler lid opener relay.
 
3.STEP 3. Check harness between fuel filler lid opener relay connector terminal number 3 and ECM connector terminal number 83.
Check output line for short circuit and damage.
Q: Is the check result normal?
Repair or replace the connector, or repair the damaged harness wire.
 
4.STEP 4. Check harness between fuel filler lid opener relay connector terminal number 1 and ground.
Check ground line for open circuit and damage.
Q: Is the check result normal?
Repair or replace the connector, or repair the damaged harness wire.
 
5.STEP 5. Check harness between fuel filler lid opener relay connector terminal number 5 and IPDM E/R connector terminal number 78.
Check power supply line for short circuit and damage.
Q: Is the check result normal?
Repair or replace the connector, or repair the damaged harness wire.
 
6.STEP 6. Check harness between fuel filler lid opener relay connector terminal number 4 and fuel filler lid lock release actuator connector terminal number 1.
Check output line for short circuit and damage.
Q: Is the check result normal?
Repair or replace the connector, or repair the damaged harness wire.
 
7.STEP 7. Check harness between fuel filler lid lock release actuator connector terminal number 2 and ground.
Check ground line for open circuit and damage.
Q: Is the check result normal?
Repair or replace the connector, or repair the damaged harness wire.
 
8.STEP 8. Using scan tool (M.U.T.-IIISE), perform the actuator test.
Use scan tool (M.U.T.-III SE) to perform the actuator test (Refer to ACTUATOR TEST REFERENCE TABLE).
  • Item number 120: Fuel Filler Door Motor Relay
OK: Fuel filler lid opens
Q: Is the check result normal?
Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION).
 
9.STEP 9. Using scan tool (M.U.T.-III SE), DTC recheck after erasing DTC.
After erasing the DTC, check again to see if the DTC is set again.
(1) Use scan tool (M.U.T.-III SE) to erase the DTC.
(2) Turn OFF the power supply mode of the electric motor switch.
(3) Turn ON the power supply mode of the electric motor switch.
(4) Use scan tool (M.U.T.-III SE) to recheck the DTC.
Q: Is DTC P04C1-00 set?
Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION).
Intermittent malfunction (Refer to GENERAL INFORMATION, General Information – How to Use Troubleshooting/Inspection Service Points – How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).