Ford Mondeo III (2000 - 2007) - 04 2.0 code fault

Honest John Back Room » Technical matters
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Tue 6 May 2008 14:55
04 2.0 code fault - dmac
I have a 04 mondeo 2 litre TDCI, The problem is that the glow plug light starts flashing and the car loses power, fault clears when you restart the car, its been and had the injectors redone and it is still happening, the mechanics don't know what the problem is and its showing a new fault code P0251, does any body know what the problem is? thanks for any help.
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Tue 6 May 2008 15:34
04 2.0 code fault - Screwloose
dmac

Quite a complicated business explaining the origin of a P0251 on a TDCi.

On the face of it; it doesn't relate to a TDCi as it's a spill-valve, or rotor, code from a TDDi-type injection pump.

You should have had a P1211 code as well - yes? The P0251 is generated as an EOBD equivalent to a pre-cursor code to that P1211 - Delphi codes 45 and 46; "Rail pressure control trim/error."

If either of those exist for long enough, or occur often enough; it sets P1211; but while it's still adding them up, you'll get P0251.

There you are - clear as mud.

Basically; the fuel pressure in the rail is not as commanded. This could be an inlet metering valve fault; a high-pressure pump fault; [aargh!] an injector leaking-off excessive amounts; a fuel filter blocked; [common] air getting into the feed - that sort of thing.

Proper testing needed to define which of those reasons is the true one - if any.
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