I’ve recently become the proud owner of a Pico. As you can imagine I’ve been playing with it, basically the more I play the questions I have.
One of the first questions is a systems operation library? Is there a site or some resource were you can look-up the operation of the different sensors over a wide range of makes and models?
Looking at a wave forms on a Kia Sorento Air flow sensor this is what I found on the 5 pins.
1. 12 volts
3. Analogue Signal??I didn’t save the capture but it didn’t change over the rev range. (Temp sensor?)
4. 3.02volts(digital volt meter reading @ idle) Square wave 54% Duty (Fixed frequency never changes over the rev range…no load…snap throttle)
5. 2.59volts(digital volt meter reading @ idle) Square wave Frequency modulated about 2.8Khz at idle and around 5Khz at high idle) [50% Duty cyl]
My assumptions was that pin 3 was the Temp sensor signal, Pin 5 was/is the air flow signal it’s frequency changes over the rev range. What’s pin 4 all about it just sits there at fixed frequency and duty cycle????