CAR OBD CODES

P0485 OBD Code Definition:
P0485 Cooling Fan Power/Ground Circuit Malfunction
P0485 OBD Code Description:

OBD2 Code P0485 Definition:
The electric cooling fan is controlled by the powertrain control module (PCM) through the cooling fan relay based on inputs from the following components: – The engine coolant temperature (ECT) sensor – The intake air temperature (IAT) sensor – The A/C selector switch – The A/C refrigerant pressure sensor – The vehicle speed sensor (VSS) The PCM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay. The cooling fan relay will be commanded ON when the following conditions are met: – The engine coolant temperature reaches 106¡ãC (223¡ãF) or more. – The A/C clutch requested. – The vehicle speed is less than 38 MPH. The cooling fan relay will be commanded ON regardless of vehicle speed when the following conditions are met: – The engine coolant temperature is 151¡ãC (304¡ãF) or more. – The A/C refrigerant pressure is high. The cooling fan may be commanded ON when the engine is not running under a fan run-on conditions described in the electric cooling fan general description portion of the service manual. Symptoms

Possible sumptoms of P0485
– Engine Light ON (or Service Engine Soon Warning Light) – Engine overheating Possible Causes

Possible causes of P0485
– Fan control relay harness – Fan control relay connector – Fan control relay – Cooling Fan The Error code is generally activated on detection of the following conditions: The P0485 code is detected when the PCM detects that the commanded state of the driver and the actual state of the control circuit do not match. Possible Solutions

– Replace the malfunctioning fan control relay – Replaced cooling fan
Note: The information on the P0485 error code is purely informative, if you need more useful information, please consult your technician.