AC > Condenser Fan Issues 2018 Nissan NV 2500. 5.6

[Bobby G]

Hello,

Does any one know what are the inputs that the main ECU is supposed to be monitoring to activate the condenser Fan. Is it pressure AC knob position? etc
In other words what are the inputs that are supposed to be driving the Condenser Fan? At what point does the Condenser fan kick on? As im reading the pressure switch output from the controller voltage goes up to 5V then the Compressor shuts down for safety. With out the fan working.
Here is a bit of a description.
The AC does work when the vehicle moves at certain speed. So as the Air is moving through the condense it keeps the High side pressure low enough to keep the AC ON and operational.
Once at a stop the High side pressure goes above 380 PSI or around there and then the Pressure switch safety cuts OFF the compressor.
The AC System is charged correctly and it does not have a leak. The amount of refrigerant is what the manufactures sticker on the hood is shown.
The door test does turn ON the Condenser Fan every time the test is activated. So the Fan it is operational. Also when jumping the wire from the Relay board does come on.
IPDM is also good, now bad relay nor IPDM issue.
Does any one have any similar issues or know about it?

What drives the condenser fan? Is it controlled through the IPDM and ECU via a CAN network? How do you see the ECM command through a CAN Network?
Thank you 

[crusty]

A dealer Consult service tool will show all the details.  It can also do an active test and force it to run.

The trigger for the electric fan is based on vehicle speed, engine temp, A/C pressure.

 

Now being you have a 2018 with the 5.6 you have a second electrically controlled fan.  That is the engine driven fan.  As I recall, that one doesn't really have any decent scan tool options.  The fan clutch can fail and the fan won't move any meaningful airflow. 

 

The initial description of what you are looking for sounds like you are searching for info on the electric fan.  What it sounds like is the fan clutch isn't working.  So not sure which fan issue you have, or if both?