[sawyer1]

From my understanding this controls voltage to the FICM and PCM does anyone no where it is??? thanks a bunch!

 

[sinner6.0L]

reference voltage is a constant voltage sent out from the PCM to various sensors to have a reliable input feeding back to it

vref never changes, it's always 5v

 

[sawyer1]

Thank you... do you know how to tell if its bad?