406 hdi fault code help

djmartin · Post by **djmartin** » Thu Sep 27, 2007 6:47 pm

hi i have a 406 hdi 90 and it has gone in to safe mode all the time now i have had the ecu read and clened but the only code that came back was (po 230 fuel pump primary circuit)
does anty one no wot this means about a month ago i changed the high presure pump about 2 weeks ago and it ran fine now it started this when it is ticking over it also cuts out with out any warning and if you take you foot off when driving it it cuts out as well then you have to take the keys out and put back in prime the pump in the tank and it will start as normal

martin

mbell666 · Post by **mbell666** » Thu Sep 27, 2007 7:36 pm

I would say it the low pressure pump (or wiring in the tank). (not 100% the 90 has one thou, some people in the past have said they don't)

There very common failure on HDi's any signal if its on its way your best replacing it as it can take out your high pressure pump (it also about the cheapest part of the system). I' probably give it a new fuel filter and housing too.

IF I suspected any problems with my high pressure pump the first thing i would do is change the low pressure pump and probably fuel filter/housing.

jameslxdt · Post by **jameslxdt** » Thu Sep 27, 2007 8:34 pm

depends on the fuel system, bosch 90 has in tank pump but siemens 90 doesnt, let me look up the fault code and i will be back

jameslxdt · Post by **jameslxdt** » Thu Sep 27, 2007 8:37 pm

right p0230 is fuel pump primary circuit failure, i would check for feed to the in-tank pump, if that is ok, then it could be an intermittent wiring fault, its unlikely to be an intank pump as they usually just fail completley

djmartin · Post by **djmartin** » Thu Sep 27, 2007 8:57 pm

hi have put a live to the pump and it still does it when the engine cuts the pump power cuts as well but when you take the key out and put back in it will start as normal might run 4 about a min or cut out within 20sec i drove 300 miles on monday and it never missed a beet then went out to it monday night and it cut out once but started again drove 150 miles on tuseday and was fine but yesterday did it once after 40miles then got worse and after cutting out 10/15 times went in to safe mode and will not rev above 3000rpm and now just cuts out after 30seconds of running it is stange
martin

djmartin · Post by **djmartin** » Sun Sep 30, 2007 1:34 am

hi just been told it could be the ecu is that posable before i go and buy one
martin

mbell666 · Post by **mbell666** » Sun Sep 30, 2007 7:32 pm

Could be ECU but there not really known for going.

I'd still change the Low pressure pump, make sure it not related to that. I think they are around £50 (cheaper than a ECU!) and you'll probably have to change it at some point anyway.

Post by **Welly** » Mon Oct 01, 2007 9:52 am

The ECU itself never goes wrong. Moreover it is the wiring that is at fault.

The ECU connector pins have been known to corrode and throw a wobbly also check the loom where you can for signs of obvious chafing or abrasion.

In tank pump? could be worth changing but it won't explain the power failure to the pump and like James said these pumps just seem to go quickly and you get a non-starter.

I think it will be the wiring at the ECU end but it won't be all that easy to find.

Good luck!

djmartin · Post by **djmartin** » Wed Oct 03, 2007 3:14 pm

thanks 4 all help and advice got it fixed today it was the plug 4 the rail sencer under the filter it was full of derv dryed it off and gave it a clean and it is now fine
martin
hope is stayes like it