P0406 ERG code cause?

[persalls]

Hi guys!

In the pursuit of correcting errors on my new(old) truck I found out that PO has deleted the check-engine bulb and I have a P0406 error in the car. Yesterday I removed the EGR-valve and cleaned it out, wasn´t all that dirty, and since I do not own a vacuum-tester I mechanically moved the valve stem and blocked the vacuum-line input to see if the diaphragm would hold the valve in place, and it did. I think that this is an accurate test but maybe not? I went on to check the next device which would be the solenoid and it has 12+v to it, it has vacuum in the lines but Im not sure how it should behave if i put 12v directly to it´s terminals?? I removed the solenoid and sprayed some solvent, electrical cleaner, in it and compressed air though it´s inlets and it looks to be ok but I´m unsure about how to check it´s electrical behavior? I have checked for vacuum-leaks all-over and found the 90 elbow behind the alternator to be broken. Changed it and fixed all other lines that I can find and probably should make a complete system reset for learning curves to be correct, as fuel-trim and stuff, but the 406 need to disappear in order to pass the Swedish yearly check-up. This is also why I posted the question in a separate thread regarding what bulbs to buy before dismantling the instrument-cluster.
Any thoughts will be greatly appreciated.

//Brg, Per

 

[koda2000]

A bad DPFE sensor?



There are also YouTube and checking and cleaning the DPFE.

 

[persalls]

Thanks, that is a very possible cause! to bad we don´t have any "Auto-store" in Sweden... everything has to be ordered :-(

 

[koda2000]

Thanks, that is a very possible cause! to bad we don´t have any "Auto-store" in Sweden... everything has to be ordered :-(

Well, I'd do the DPFE test procedure to make sure that's the problem before ordering a new one.

Maybe reading the below thread will be helpful:

http://www.explorerforum.com/forums/index.php?threads/egr-valve-replacment.304795/

 

[persalls]

Thanks guys! I followed the procedure in the thread and I can´t get any, or close to none, reading on my meter. I can see it fluctuate if I blow in it but no way near any 5 volts and it has got the 5 volt feed so I guess it´s the culprit.

//Brg, Per

 

[koda2000]

Let us know if replacing the DPFE solves the problem.

 

[persalls]

will do, need to find one over here or else order one from the US so it will probably take a while.

 

[persalls]

just a thought, do you guys think it would be possible to use a DPFE from an older Explorer as long as the electrical connection would fit? I have found one at the local breakers but it is from an -98 Explorer so it´s of course not correct but will it do the trick you think?

 

[koda2000]

just a thought, do you guys think it would be possible to use a DPFE from an older Explorer as long as the electrical connection would fit? I have found one at the local breakers but it is from an -98 Explorer so it´s of course not correct but will it do the trick you think?

RockAuto's on-line parts catalog shows different DPFE part numbers for the '98 and 2003, so I'd say no.

 

[persalls]

it differs in external design so it will not be the same partnumber but Im not convinced that the internals will differ. I do believe its a relatively simple device but I guess its bound to fail over time so if used it must be close to "free" so more for testing than final replacement where my thoughts.

 

[koda2000]

If you can get for next to nothing I guess there's no harm in trying it, but it doesn't work does it mean it's somehow different, or that it's not the problem? I guess it's worth a try if the electrical connection is the same.

 

[persalls]

So guys! Receivied a brand new Motorcraft DPFE (4) yesterday and have been driving city and highway, slow and "fast" plus a lot of start & stop. So far everything seems just fine and the old DPFE seems to have been the culprit. CEL stays off so fingers crossed.

//Brg Per