megan 1.5dci hard start P0340 camshaft sens.

[juniormaxxx]

Ok here is story...card OK...steering lock OK..all immo stuff related OK..at least at diagnostic via KTS..but car sometimes cant fire up..
I was working on front fuse box because car have aditional taster switch for starter (?) repair it fine put new chinese small relay and now car engage starter on press of buton..like it should be when all is fine..

when car CANT fire up..starter spin for 10 second and stops on diag there is eror 0340 camshaft sensor (something)....is this cam so important for start?
when CANT fireup ..there is about 280 O/min and rail presure is in 3 sec about 280-300 bar..so all this looks fine ..yust cam ..Iwill order new one but sound strange that he is so important..its CAM not CRANK..
any idea ? from french car lovers ...

Meaty ?

will add picture of repair later

[alessioblaupunkt]

It is important: incorrect valve timing = NO START
Year of the car?

Probably it's not cam sensor but belt or chain tensioner.

[juniormaxxx]

It is important: incorrect valve timing = NO START
Year of the car? Code is P0304?

Probably it's not cam sensor but belt or chain tensioner.

but in one from 10 starting it start and run fine ???
belt changed few days before (customer story) in renault service (again customer story) they call this big service..

forgot to say..when it crank..sounds like it will catch it, its almost fired but crank stop...so maybe realy wrong timing..I send customer back to ren.serice to check timing belt...will see what should be...update tomorow

[autoden]

ECU has to see cam and crank sync before permitting start. You can see this in live data. On some engines, after start cam sensor does nothing, but most use cam sensor for injector timing ref. So yes cam sensor is very important.
autoden

[alessioblaupunkt]

Here we goooo!
Known fixes and bulletins: intermittent failure to start:
Faulty crankshaft position sensor


Replace it! (And see how things go.)
Do not send customer to Reno.

[dell66]

Contr?ler la position poulie par rapport AAC AAC /////////
saisie !!!!!!!!

[alessioblaupunkt]

dell66 told you to check the timing marks as you can see in the attached document.
If they are ok, go with my previous post.
I suppose you have the K9K722 engine, if not tell me what engine there's under the hood.

[mikula7]

The same problem with my Megane II K9K engine. Hope to find out what is going wrong.

[synkrotronic]

If sensor/wires are good,fuel pump incorrect position,confirm...

[nikak]

HELLO TO EVERY ONE
I have the same problem in a Nissan micra k12 1.5dci (reunault engine) with the same problem i try everything i know adout this ( cam sensor, wires, ecu,) but NOTHING
May someone HELP me pls
thanks a lot

[rideon]

4 year thread ...
One DFM f@#ks up the timing on the engine and 100 diag tools cant fix it...
dell66 ansvered the original question a while back...

[Meat-Head]

4 year thread ...
One DFM f@#ks up ...

Dumb fôök mechanic !

yeah old thread but such a buzz getting "dephaser pulley" on invoice no less than 4 times