Car Cooling Fan Control Circuit

The vehicle s pcm s function is to act as a ground to operate components not to supply power.

Car cooling fan control circuit.

This will be the wire that connects your switch to your fan power wire. The temperature controlled switch is designed to turn the fan on when coolant temperatures reach 195 degrees and turn off the fan when temps drop to 185 degrees. So now we have a wire that goes through the engine bay to the cabin of your car. Because it can allow the engine to overheat.

The fan relays are nothing but a remote light switch. On applications that have variable fan speeds. Which may not be fast enough to prevent overheating. Get the 10 gauge wire and place it through the hole in your fire wall.

A constant power supply from the battery is present on a terminal in each of the relays. The ecu then triggers a check engine light to illuminate on the dashboard. This one turns on the fan when the circuit is closed. The electric cooling fan uses a direct current dc electric motor with a thermo switch module or computer control to turn it on or off depending on coolant temperature or ac operating condition.

What causes the p0480 code. During the install christian shot. The vehicles ecu has tried to control the cooling fan 1 and it has failed to operate or a fault was detected. On older fan circuits the thermostatic switch connects to battery power on one side and to the fan motor on the other.

Now take the power wire from your fan and connect it to the wire that is going through the firewall. P0480 means that the cooling fan 1 control circuit has a malfunction. The fan may work but it only runs at low speed. The engine may also overheat if fan speed fails to increase when additional cooling is needed.

A switched terminal will be hot only when the key is on.