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Old 04-06-2018, 09:25 AM   #32
rondeo
FF.Com.Au Hardcore
 
Join Date: Mar 2013
Posts: 805
Default Re: Engine malfunction warning and P244C DTC

Ooops I got DPF_SOOT and DPF_LOAD round the wrong way in my last post.

Though not specifically about Mondeo this text from Fordservice.com is indicative of the sort of strategies used to flag a P002
DTC:

'The DPF Filter Efficiency monitor compares the calculated restriction (from a sensor measuring delta pressure
across the DPF) to the expected restriction calculated from a soot model (using various engine sensors as inputs).
After a successful regeneration event, the monitor waits for DPF temperatures to fall below a threshold (400 degC,
to allow for an accurate soot estimate)and for a small quantity of soot to build up in the DPF (approx 3 grams). At
this point, the monitor performs a filtering routine on the calculated restriction (from deltaP sensor) and locks in the
initial restriction. Once sufficient soot has built up in the DPF (based on integrated soot from the soot model), the
monitor will repeat the filtering routine on the calculated restriction (from deltaP sensor) and from the estimated
soot in the DPF (from soot model). The ratio of restrictions (actual vs soot estimate) is compared to a threshold. If
the ratio is less than a threshold, an error flag is set. The monitor allows for multiple monitoring sessions in order to
provide debouncing before declaring the monitor as a pass or fail. When a sufficient number of sessions have
been completed, the monitor is declared complete. The number of sessions with a failed result is compared to a
threshold. If the number of failed sessions is greater than a threshold, the monitor is declared as failed and the
code is set.'
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