When does the ecmcontrol turn on the cooling fan?

The ECMcontrols 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°C (223°F) or more. – The A/C clutch requested. – The vehicle speed is less than 38 MPH.

How to control the speed of a DC fan?

Here is Some circuit diagram of DC fan Regulator Using PWM Method. BY using This Circuit You can control the speed of DC Fan by tuning the (Potentiometer) volume control variable resistance. These circuits are based on 555 Timer . Circuit 1. (Tested At 12v 1A DC FAN)

How does the cooling fan work on a Dodge?

P0480 Dodge Description The electric cooling fan is controlled by the Engine Control Module (ECM) 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

How do you test a fan control relay?

Then, they use the scan tool to check the datastream and confirm the VSS sensor has proper readings, and if the coolant temperature sensor is reading accurately. Then they test the fan control relay using a relay tested, or switch the relay using a good relay to test.

Where is the fan drive pin on a Cummins diesel?

Using Tool 6801, backprobe pin 1 of the electronically controlled viscous fan drive connector, with the harness connected located at the lower fan shroud to battery ground. NOTE: The fan drive control coil is energized to 12 volts at this time.

When to set a trouble code on a fan?

Trouble Code (DTC) can be set. Trouble Code (DTC) can be set. ² If fan speed is not detected a DTC will be set. ² Coolant temperature sensor circuit problems can set a DTC. If the problem is sensed in a monitored circuit often enough to indicated an actual problem, a DTC is stored.

When does the ecmcontrol turn on the cooling fan?