C5 2.2 HDi fuel filler cap sensor replacement

[mikeC5]

Thanks Tim, I've found someone with a Lexis (Lexia?) who thinks that what I thought was the filler cap sensor might be something to do with the alarms (someone trying to nick fuel). Will get it checked this pm.

It seems that the filler cap switch is not operating! At least , that's the first thing to fix. So........
MikeC5

[tmead]

Also worth checking that the cap still has its magnets - they have been known to come out I think. simple test with a steel washer !

[mikeC5]

Thanks Tim, I've found someone with a Lexis (Lexia?) who thinks that what I thought was the filler cap sensor might be something to do with the alarms (someone trying to nick fuel). Will get it checked this pm.

Now I feel reallyy stupid! Turns out that what I thought was a switch is simply to hold the filler cap closed!

[KP]

Is it possible to just plug some resistors in and avoid this issue as my C5r 2.0hdi is displaying this on lexia but don't mind removing it and using the forces regen to clear the system out for the short term until I get it remapped out

[aea_s]

Tim

On mine there were two blue twin connectors and a separate black twin connector actually attached to the large round plastic cover. The wire number ID's on the white incomers are 738 & 733.

I've dug up my old Cit invoice and the part number is 6534HY described as a 'Loom' and cost me £27.59 + vat in Jan'09.

The circuitry is simply a 15ohm and a 150k in series with a N/C reed contact across the 150k resistor. When the cap magnet comes into influence, it causes the contact to 'open', thus presenting the ECU with a 150k + 15ohm passage, or when cap removed just 15ohm.

Regards
Allan

Hi Allan,

I know this was from quite a while ago now - but you have given me hope that I can go and tackle our C8 fuel flap sensor in a similar fashion! I hope it's a similar arrangement on the C8 as Lexia is reporting that ours is kaput!

Best wishes,

Andrew