If you look physically at the DPF unit which houses both the catalyst and the filter, there is a pressure sensor over the DPF filter which supplies a analog voltage to the ecu.
On a scantool (snap on, g-scan ect) there is 2 PID readings available for DPF pressure. One reading is stable, say .57 the other is a live reading which will fluctuate as engine rpm increases and decreases.
I can only assume that the two equations mentioned above relate to these two PIDs.
On a scantool (snap on, g-scan ect) there is 2 PID readings available for DPF pressure. One reading is stable, say .57 the other is a live reading which will fluctuate as engine rpm increases and decreases.
I can only assume that the two equations mentioned above relate to these two PIDs.
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