This trouble code refers to the engine cooling fan circuit, as it experiences a malfunction causing the fan to fail, which then leads to engine to overheat. For an intermittent, refer to. What repairs can fix the P0481 code? The cooling fan may need replacement. What repairs can fix the P0481 code? This mode is operating as a parallel circuit. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Now Follow Step 11 Now Follow Step 13 10 Mend the faulty relay control circuit.
Did you find and correct the condition? Common Causes Common causes include a bad cooling fan motor or a faulty cooling fan relay. During high speed fan operation, both engine cooling fans have their own ground path. Now Follow Step 14 - 11 Replace the faulty relay ignition feed circuit. There is a good video on youtube on how this three relay cooling fan system works an how to trouble shoot. Then they test the fan control relay using a relay tested, or switch the relay using a good relay to test. The P0481 code will not prevent the vehicle from starting and driving, but all the same it can be a serious issue.
The cooling fan system in this vehicle provides for two separate modes of operation. If the same code comes back, then both cooling fan 2 and the associated relay will be inspected for damage or a short in the wiring. Refer to in Wiring Systems. Refer to in Wiring Systems. This ensures idle stability by preventing the fans from cycling between high and low speed. Current flow continues through the motor on circuit 532 to relay 3 which is now energized. At the same time, the high speed fan relay coil is energized closing the relay contacts, and provides battery positive voltage from the high fan fuse on the cooling fan motor supply voltage circuit, to the right cooling fan.
. The high speed mode operates both fans at full speed by using a parallel circuit configuration. Now Follow Step 8 Now Follow Step 6 6 With the test light connected to ground, inspect the ignition feed circuit in the relay harness connector. There is a good video on youtube on how this three relay cooling fan system works an how to trouble shoot. Simple things like a bad wire or corrosion around the connectors can cause trouble codes to appear. Did you find and correct the condition? A qualified technician will use a scanner that is capable of scanning the factory sensor readings more advanced than one from the auto parts store to read the code. How does a mechanic diagnose the P0481 code? The numbers below refer to the step numbers on the diagnostic table.
This will aid in understanding the two distinct modes of operating the relays and coolant fans. This provides power to the Right Hand cooling fan motor. Need help with a P0100 code? Some vehicles require multiple drive cycles usually three for the service engine soon lamp to be illuminated. This can happen whether the vehicle is sitting still or driving at slow speed. Visually inspect for frayed or broken wiring on the connector or harness. The list of automotive Makes at the right edge of the screen. Refer to in Wiring Systems.
The technician will then observe data on the scanner while driving. The unenergized relay 3 switch contacts allow current to flow to circuit 504. Basically, the Error Code P0481means the cooling fan 2 control circuit has experienced a problem, causing it to malfunction. Verify motors work by powering up with jumper wires. If none of the above steps solve the problem and make the code go away, then the cooling fan itself may be to blame.
Enter the 5 character trouble codes in the search box and submit the search. The information contained on this site is presented for informational purposes only. P0481 code definition The P0481 code identifies a problem with the control circuit for cooling fan 2. This system which uses three relays to control two fan motors appears complicated. The cooling fan should be commanded on under certain conditions where the engine requires more cooling, and this is controlled via the. We are not responsible for any actions you take on your vehicle. Refer to in Wiring Systems.
Refer to Diagnostic System Check - Vehicle. This fan now has its own dedicated circuit and will operate at full speed. What causes the P0481 code? Note: Here the value is 0. Repair or replace the wiring as necessary. The cooling fan system in this vehicle provides for two separate modes of operation. Sometimes small electrical issues or malfunctions can falsely set off codes, so the first step in diagnosis is always to reset the code and see if it activates again when the vehicle is running.