Hello Everyone,
I have researched but cannot seem to understand the behavior of the PWM AUX Table on a M400 ECU.
I am trying to drive a PWM controller using Function 3 on AUX 1 with RPM and GEAR as axis.
I have set the ECU to do high pull up, min duty 0, max duty 100.
My table goes from 0 to 100 in duty cycle, but I noticed my pump (attached to controller) is off from 0 to 50 and then turns on to full speed from 50 to 100.
I attached an oscilloscope and noticed that there is no PWM, it's behaves like a switch (over 50% on, under 50% off)
I got my controller to work properly using the "test output" function in ECU manager.
What am I missing, I saw some forum post about using a pull up resistor and using different AUX outputs.
A forum post mentions to switch the polarity to 0 (switch to ground and use a pull up resistor from a 12v source), is that the correct way ? I am used to micro controller Pwm signal of 5v square wave.
Thank you!