Refueling System Operation

The hybrid/EV powertrain control module 2 monitors the voltage values of the fuel fill door open request wake-up signal circuit and the fuel door request signal circuit. When the refuel request switch is pressed, the two switch contacts close. This provides B+ to the wake-up circuit input and changes the voltage level of the fuel door request signal as it passes through a single resistor instead of 2 resistors. The hybrid/EV powertrain control module 2 will detect the 12 volts on the wake-up circuit and the voltage change on the fuel door request circuit, it will then command the fuel system to vent and sends a serial data message to the driver information center to display the Wait to Refuel message. The hybrid/EV powertrain control module 2 then energizes the fuel door lock/unlock actuator to unlock the fuel door.

After the system has been vented, the hybrid powertrain control module 2 will send a command to unlock the fuel filler door and will send a serial data message to the driver information center to display the Ready To Refuel message. After the vehicle has been refueled, the hybrid powertrain control module 2 will send a serial data message to the driver information center to display the Close Fuel Door message until the fuel filler door is closed. The hybrid powertrain control module 2 will then command the fuel filler door to lock 5 seconds after the fuel filler door is closed or the vehicle speed exceeds 40 km/h (25 mph).