RADustin
March 16th, 2015, 08:36 AM
Another day, another question for the gurus...
I swapped in my 2 bar and changed C6301 to make the reading output the same as my 1 bar was reading at KOEO...pretty easy.
Question is- it looks like the ecu applies the voltage from the MAP(A/D counts) into a linear formula using C6301 and 6302 to get the pressure in kPa.
Seems like each sensor should have it's own scaler (line slope) and offset(y-crossing).
If this is accurate- then why do we not change the offset? I was going to take a vacuum pump and check the MAP at another pressure less than atmospheric to validate this reasoning. Maybe if I set the scaler to 1 and offset to 0 and pull a couple different known pressures on the MAP, put in excel and linear fit to find the actual scaler and offset.
Seems reasonable?
I swapped in my 2 bar and changed C6301 to make the reading output the same as my 1 bar was reading at KOEO...pretty easy.
Question is- it looks like the ecu applies the voltage from the MAP(A/D counts) into a linear formula using C6301 and 6302 to get the pressure in kPa.
Seems like each sensor should have it's own scaler (line slope) and offset(y-crossing).
If this is accurate- then why do we not change the offset? I was going to take a vacuum pump and check the MAP at another pressure less than atmospheric to validate this reasoning. Maybe if I set the scaler to 1 and offset to 0 and pull a couple different known pressures on the MAP, put in excel and linear fit to find the actual scaler and offset.
Seems reasonable?