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I want to make an circuit to use 3 pin IACV (OBD2) on 2 pin OBD 1 ECU.
I have found that 3 pin IACV it is controlled by duty cycle like 2 pin IACV but i don`t know the frequency.
Unfortunately i do not have a car with OBD2 to check what this signal looks like exactly.
If anyone could check it for me with oscilloscope i would be very grateful.
OBDII IACV B23 pin controll signal.
