DTC P0480: Radiator Fan Control (RFC) System Malfunction: General Description

The radiator fan control (RFC) system improves the control of the radiator fan motor and the condenser fan motor and decreases noise and vibration. The powertrain control module (PCM) detects a malfunction when the RFC terminal voltage remains at 0 V. However, the RFC power is shut off temporarily when a malfunction is detected to differentiate it from the RFC protection function (*1). (Hereinafter, referred to as 'power reset') When the RFC terminal voltage remains at 0 V even when the power reset is repeated for set time, the PCM detects a malfunction of the RFC and a DTC is stored.

*1 RFC protection function: When excessively high current due to a locked fan motor, etc. is detected or at abnormally high temperatures, fan motor operation is limited to protect the RFC unit and keep the RFC terminal voltage at 0 V. When the problem is cleared by turning off the power once and turning it on again, the RFC protection function is canceled.