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The extended Ford PIDs include one for Exhaust Back Pressure, like this:
PID 221445
Min value 0.0
Max value 100.0
Scale factor x1
Unit type -
Equation (A*256)+B
The thing is, it doesn't work. Specifically, it displays values in the mid 300 range, when it should display valuse from 0 up to about 70. Does anyone know what I need to change to get this to work?
Vehicle is a 2001 PSD Excursion (with the 7.3 PowerStroke engine).
Mark
Posted : 27/10/2012 10:05 pm
Here is the one for my 6.0L
I see it is reading the same PID.
I am putting in a space between each character for easier reading in the equation, do not put in these spaces:
( ( A * 256 ) + B ) * ( 36.25 / 1000 )
And as it should be with out spaces:
((A*256)+B)*(36.25/1000)
Posted : 29/10/2012 2:07 pm
I haven't tried this on my 7.3L but this is what I would use:
PID 221445
It's 2 bytes with 0.25 resolution min value = 0 max value = 16383.74 = 65535*(1/4) and measured in kPa so you will need to multiply the result by 0.14503773773 to get PSI.
(((A*256)+B)*0.25)*0.14503773773
Posted : 12/04/2013 12:50 pm
