P0340 cranks but no cigar whats the procedure

[darbuck]

Hi lads I started a new thread for this because my other posts are gone cold, my mk1 2.0 hdi c5 has decided it doesn't want to fire anymore and the fault code coming up is P0340 I have replaced both cam and crank sensors because they were both chewed up at the edges. I am beginning to think there is something more than just sticking new sensors in, is there a specific procedure to follow when installing. Also my engine speed is apparently incorrect also. I know my timing belt is still intact but I will check to see if the timing is correct tomorrow if I cant get anywhere with the sensors. this is starting to really drive me bananas at this stage the car has taken the summer to get to this point, I had it running perfect on friday but I had to remove and repair the exhaust yesterday, Saturday, due to a leak and now it turns over but wont start and now she is gone into eco mode.

[411514]

Hi Darren, I personally would not be over-reliant on fault codes, I often find them misleading. It sounds like a tricky problem rather than a common well known one with an known cause.

I maintain though that it sounds fuelling related to me, and electrical rather than a genuine lack of fuel. I would firstly then rule out the fuel rail pressure sensor/regulator. One further though, can you hear the LP fuel pump prime when you turn on the ignition?

[darbuck]

yes pump kicks in every time Sam, I also agree with you on the point of fault codes but its giving me a starting point . my concern is, is there a specific gap on sensors between cams and flywheel but this was the code which made me consider replacing the sensors which disappeared for a couple of days . I might try a bsi reset.

[wheeler]

The crank sensor is not adjustable the cam sensor is, i just push it hard against the cam pulley then just back it off ever so slightly.
Does the engine fire on a sniff of easy start ?
Is there a feed at the cam sensor ? Think it should be 12v as its Hall effect. My next check here would be checking the valve timing.

[bobins]

..................................I had it running perfect on friday but I had to remove and repair the exhaust yesterday, Saturday, due to a leak and now it turns over but wont start and now she is gone into eco mode.

Before you pull any more hair out - fully charge the battery and see if it starts.

[darbuck]

thanks bobins, I will but she wouldn't start on a full charge, she is in eco mode from trying to get her to start, hopefullyI will figure it out.

[RichardW]

Eco mode won't stop it starting, it's just to protect the battery, so none of the ancilliaries will work (windows etc).

It will never start if it doesn't see cam / crank synch, as it requires this before it will fire the injectors. You should be able to see in Diagbox if the crankshaft sensor is working as it should give a reading of engine speed when cranking. There is no feed back from the cam shaft sensor (except to say that it's got cam / crank synch). You might get a fault if it's open or short circuit I guess. I would check the cranking speed, and see if there's anything from the cam sensor, then get the covers off and check the cam timing. I can't recall what work you have done, but undoing the crank shaft pulley bolt without locking the crank can be enough to shift the crank sprocket (which is not tightly keyed) and lose the synchronisation.

[Hell Razor5543]

Does the diagnostics port WORK if the car has gone into Economy Mode? I don't think it does (I am sure it does not on my C5), and if I am right it would not be possible to now see what is happening in the ECUs.

[RichardW]

I think you can access the engine ECU, but you won't be able to access anything else as they will be shut down by the BSI.

[MikeT]

You should be able to see in Diagbox if the crankshaft sensor is working as it should give a reading of engine speed when cranking.

That's good to know as it's been suggested I test the CPS is working on a non-starting 207 and I wasn't sure how.

Does the diagnostics port WORK if the car has gone into Economy Mode?

Yes, as I've experienced it both recently with a pug 207 (global scan, read & clear) and in the past with my C5.

However, they do say there's always an exception to a rule so it's also good to know (in Diagbox, at least) I was able to "EXIT ECO MODE" in order to open a window to perform a BSI reset. Yay!!!

[darbuck]

hi Lads thanks to all of you for responding , I have done loads of work to the car recently and as I said I had it going on Friday,I had to fix exhaust on Saturday and then wouldn't start but this was happening intermittently before this partially why7 I took it off the road, I currently have it charging so will plug it in this evening to check crank pulse is showing, as for cam I will have a look and see if I am getting feed. when I have checked these I will pull covers off belt if I have to, I might try some easy start first though as wheeler suggested I must apologize to wheeler I only saw your post now, I dont know how I missed it. I don't want to go near the timing belt until there is no other option as I am sure you are aware the covers are a pig!!!! to get off and on . I tried a BSI reset but it made no difference. I know with the help of all you guys I will figure it out though, when I have checked all but the cam belt I will post back. . just wondering does anyone have timing procedure for the mk1 hdi engine handy. good to hear your making progress Mike. hopefully we will be both up and running soon.

[411514]

Timing procedure is just locking the crankshaft and camshaft. You might be aware that the fuel pump is untimed.

Cam timing hole (from memory) is at about the 10.00 position (use the missus' handbag mirror to find it). Crank timing hole is accessed by removing the starter motor which, as has been discussed recently on here, isn't difficult and saves loads of faffing about with bent rods etc. I usually use 8mm (from memory) drill bits for the timing pins.

Cam belt is supposed to be tensioned using a SEEM gauge, but I have done three belt changes now, and 200k, just tensioning the new belt by feel (should just turn 90 degree between thumb and forefinger on the longest run) without any problems.

[darbuck]

Thanks Sam so what your saying is if the flywheel pin is in position it should be at TDC and the cam can then be aligned as necessary thanks for the tip on the 8mm bit I have always done cam belts by feel aswell. The no start would make sense if the belt has jumped.

[darbuck]

right gentlemen I have finally concluded that I have lost it I must have accidentally pulled the plug on the crank sensor but I only realised after checking in lexia as suggested by Richard , sorry lads, I have been spending too much time on the car lately but I got her running so happy bunny. , just a few more little jobs need tidying then I am back on the road .

[myglaren]

Pleased that you have put that to bed painlessly (the final part at least).