To cool the engine and A/C compressor there are a two fans included. They are actuated according to a vehicle speed and water temperature dependent control logic. According to the electrical wiring there are two operation modes - low speed and high speed for the fans. The voltage after the radiator fan relay is used to supply power to the radiator cooling fan. ECM determins the cooling fan speed by the water temperature sensor, vehicle speed sensor, A/C switch and A/C middle switch. If the pressure in the A/C circuit is high, A/C middle switch and A/C compressor is ON, then the radiator cooling fan and the condensor fan speed is set to high in order to fastly decrease the refrigerant pressure.
If the radiator fan relay circuit is short to battery line or open during two driving cycles, this code will be set.
DTC NO.
Detecting Condition
Possible Cause
P 1624
P 1625
? P 1624
Short circuit to battery line
? P 1625
Open circuit :
? Short circuit to ground
? Wire broken
? Too high temperature in power stage
? Engine Condition : IG ON
? Fuel Limit : NO
? Fuel Cut : NO
? EGR OFF : NO
? MIL : NO
? Open or short in circuit
? Relay
? Radiator fan
? ECM