TROUBLESHOOTING take Micro Cooling Fan  the car to check the vehicle and found the door locked after a fault car flameout, 10 min after the cooling fan is still often turn, lead to battery power is depleted, the vehicle can not be started "Micro Cooling Fan". Read fault code with fault detector, no fault code storage, check the coolant temperature sensor, air pressure sensor, "Micro Cooling Fan" control lines associated connectors, no abnormality; check the cooling fan control unit and the engine control unit take iron point, were normal. Has replaced the J271, cooling "Micro Cooling Fan" control unit, coolant temperature sensor, air conditioning control unit and the engine control unit, the fault persists, unplug the J271 but when the cooling fan stops running.