Creality Ender 3 Pro - 1.1.4 - Extruder Fan Pinout Confusion

[crossan007]

EDIT: I've referred to the wrong name in this post. The fan I was having issues with is the part cooling fan; not the hot end fan.

=== Original post ===

I've recently installed Klipper on my otherwise "stock" Ender 3 Pro.

I followed the guide to flash the bootloader from here: https://www.fission3d.com/post/flash-bootloader-and-install-firmware-with-raspberry-pi and then proceeded to follow the Klipper installation guide

My Ender 3 Pro has the Creality 1.1.4 controller board.

I used the sample config from here: https://raw.githubusercontent.com/KevinOConnor/klipper/master/config/printer-creality-ender3-2018.cfg

While following the config check document, I also attempted to turn on the cooling fan, but noticed that the controller fan turned on instead of the nozzle cooling fan

I did some searching for pinouts, and have been mostly unsuccessful at finding another fan control pin.

I located (what I assume to be) the best-matching pinout to my board from the official Creality repository ; however, the FAN_PIN referenced in this file seems to be the same pin as referenced in the printer-creality-ender3-2018.cfg file.

Where else can I look to figure out which pin my extruder nozzle fan connects to?

klippy.log

[crossan007]

I found an Ender 3 Schematic, and it seems to indicate there's only one fan control port (though this is for the 1.1.2-1.1.3 board) : https://github.com/RudolphRiedel/CR-10_wiring/blob/master/Ender3_schematic.PDF

Cross-linked related issue: Creality3DPrinting/Ender-3#27

[crossan007]

I opened up the controller box again, and it seems that the controller fan and the hotend fan are driven by the same micro controller pin. I confirmed that 24V flows to the hotend fan as expected when I send the Fan on command; it seems that my hotend fan failed concurrently with flashing Klipper.

Closing this issue as an extremely unlucky coincidence.

Both fans are pin PB4

(Original image source: https://www.azurefilm.com/en/creality-mainboard-standard-version-1.1.4-for-ender-3/ender-3-pro/ender-5/cr-10/cr-10-mini)

[Mocp-BEng]

I have exactly the same error after the same procedure