C7 Vette... Does anyone know where the PID for lift/low side fuel pressure originates/ is broadcast from?
I know fuel pressure sensor voltage is sent to the ECM. There is a PID for that voltage that is obviously ECM based.
But does the ECM convert that to a pressure and broadcast the pressure PID as well, or maybe does the fuel pump driver create and broadcast the pressure info PID?
Here's why I ask.... Scan tools show fuel pressure sensor voltage fluctuating as expected with system pressure changes, however the scan tool reading for pressure is mostly fixed at 4 bar and doesn't move. Trying to get the the bottom of it