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Old 03-06-2018, 06:24 PM   #31
rondeo
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Default Re: Engine malfunction warning and P244C DTC

Quote:
Originally Posted by bundybear75 View Post
Well the saga continues.....

When I got home Thursday PM the Mondeo had just started a burn, so I left it running (at idle) for 10 minutes whilst it completed.

Started up this morning to drive to work (i didn't have Forscan up) and Engine Malfunction warning again and this time limp mode.

Pulled over and scanned, got DTC P2002C - DPF efficiency below threshold

Reset OK and monitored the gauges. the DPF_LOAD gauge was at 0% and DPF_SOOT_LD at 25%

After about 5 minutes of driving the DPF_LOAD jumped from 0% to 25% and climbed as normal to 61% by the time I got to work (120km). It should be due for a burn about half way home so hopefully will complete a successful burn and continue on.

I have to say I'm about over these DPF problems.....



Same happened to me this afternoon: engine malfunction warning and limp mode!

Pulled over and scanned:

DTC P2002C - DPF efficiency below threshold

The DPF_LOAD gauge was at 0% and DPF_SOOT_LD at 32%.

Some time later after restarting the DPF_LOAD value was 43%.

Did some googling and found this interesting forum post, post #4:

http://www.thedieselstop.com/forums/...2-code-311269/

The DPF_LOAD value is calculated by the pcm from various input data from the engine management system etc. In other words it's what the pcm thinks it should be.

On the other hand DPF_SOOT_LD is inferred from the pressure differential across the DPF.

Anyway I took a look at the hoses to the pressure sensor and they were fine.

I'll keep driving it as is, on the assumption that there has been a glitch, or else an intermittent sensor/circuit fault.
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Old 04-06-2018, 09:25 AM   #32
rondeo
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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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Old 27-07-2018, 09:25 PM   #33
bundybear75
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Default Re: Engine malfunction warning and P244C DTC

So nearly 20,000km since the DPF problems and all is good. Looks like the vaporiser was the problem. I plan to strip the old one down and clean it out as a ready spare in case of problems in the future.

Rondeo, did you get to the bottom of your issues?
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Old 28-07-2018, 10:12 AM   #34
rondeo
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Default Re: Engine malfunction warning and P244C DTC

P2002 and EML has been a one off so far.

Everything's normal.
Could have been a glitch, snag, quirk or hitch. No Idea.

After reading your post I bought a 22mm crow foot spanner, just in case.
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