Picasso 1.6hdi P0339 Error / car turns over fine but won't fire.

brimclell wrote: ↑Mon Oct 19, 2020 9:47 am Also would it be an idea to rotate it to tdc and see if I can put locking pins in all the locking holes?

You can try that, but if you are going that far, you are almost at the point of changing the belt.

brimclell wrote: ↑Mon Oct 19, 2020 6:25 am Got the top plastic cover off and the belt is whole with teeth lined up.

Didn't have time to get the wheel off and rotate the crank - do I need to remove the aux belt? - but weather permitting I'll be able to check that and tdc alignment tonight.

If you can see the cam pulley and/or the belt, turn the crank (easier with two people, one to watch ans one to turn).

When the crank turns, the cam pulley and the belt should turn together. If they don't, you belt has lost its teeth.

Usually the teeth strip from the crank pulley, so you won't see anything wrong until the crank is turned.

If the belt has failed, and you have already done the waterpump and tensioner, then there is no need to do them again, BUT, it is a big BUT..
The belt should never have failed, so was it not changed? If the belt was not changed or inferior parts fitted, then would you need to do those again too?.. Yes.

I wouldn't go crazy, stripping parts out just yet. It is just a quick and relatively easy check to see if we are on the right track. The more you take off, the more you will have to refit and if the belt is ok, that is unnecessary extra work to get it back on one piece to move on to the next tests.

Thanks again C3Driver52

My thinking about lining up tdc was see if anything was out of sync. Would that be wise or is there an easier way to check?

Also, I did wonder whether they had really changed the parts but they were topping up the anti freeze when to collect so they'd done at least some of the work.

Will it be easier to turn the cam belt with the aux belt undone?

Also a friend has suggested checking a ring on the crankshaft - do you know what that would mean?

brimclell wrote: ↑Mon Oct 19, 2020 11:33 am Will it be easier to turn the cam belt with the aux belt undone?

Not if you turn it on the starter

brimclell wrote: ↑Mon Oct 19, 2020 11:33 am Also a friend has suggested checking a ring on the crankshaft - do you know what that would mean?

No idea, sorry.

C3driver52 wrote: ↑Mon Oct 19, 2020 11:37 am

brimclell wrote: ↑Mon Oct 19, 2020 11:33 am Will it be easier to turn the cam belt with the aux belt undone?

Not if you turn it on the starter

Good point

brimclell wrote: ↑Mon Oct 19, 2020 11:33 am Also a friend has suggested checking a ring on the crankshaft - do you know what that would mean?

No idea, sorry.

Apparently it's on the rear of the crankshaft wheel and sometimes they can come loose. Not sure what that means but I think it is going to be far too wet to do much more than get the OSF wheel off to check the crankshaft and belt for missing teeth tonight anyway.

If it is missing teeth would that mean likely cylinder head damage?

Bent valves for stripped teeth from a diesel cam belt unless you are very lucky

Don't think luck will be with me considering what's happened so far.

Going to check them as best I can just now and will report back shortly.

Wish me luck anyway.

Been out, turned it over plenty no sign of any damage to the belt looking at it from the cam shaft.

No sign that it was going to start but one thing at a time.

Is my next trick tomorrow to jack the car up and see what things look like around the crank shaft?

Also the crankshaft ring is apparently called a reluctor ring.

Does that mean anything?

brimclell wrote: ↑Mon Oct 19, 2020 7:57 pm Also the crankshaft ring is apparently called a reluctor ring.

Does that mean anything?

It is the part of the crank pulley with the bumps that creates the signal in the crank position sensor.

As the crank rotates, its also turns the crank pulley and the reluctor ring creates an alternating signal in the crank sensor.



The crank position sensor is arrowed in green, the crank pulley in central and the reluctor ring is part of the pulley.


You have to remove the TVD and lower cambelt covers to get to this point to access the crank sensor and its pulley. The picture was taken during a cam belt change.