Vauxhall Vivaro 2.0 dreaded cam sensor fault!!

[overlandimpulse]

Evening all! I have a 2010 Vauxhall vivaro 2.0dci M9R 788.
A quick history of what has been done, Cam chain kit, wiring loom (2nd hand), cam sensor x2, crank sensor, 2nd hand ECU from 2011 van and various other parts not relating to the fault.
Now i have had a P0340 camshaft postion sensor faulty code since buying the van among other codes.
I have managed to sort all the other codes out except the cam code, I changed the ecu due to a burnt out pin and a eeprom error which have now all been sorted and also fitted a 2nd hand wiring loom due to other wiring issues.
I have tried 3 different cam sensors including a genuine one. i have done all the checks to the loom, i have also scoped the cam sensor signal at the ecu end to check the signal wasnt distored or being affected by other emf. the sensor scoped perfectly. the van drives like a dream and goes well. the only downside is the lights on the dash and the few more turns it takes to crank.

I have rechecked the timing in the last few weeks and now am at wits end.

Does anyone know of an actual fix for this code?
does the ecu store chain wear info? (although strange its on both ecus)
Could my timing tool be wrong (bought for this engine)
could the blueprint timing chain kit be wrong?
I have just spent out on a gearbox and a few other parts so dont want to throw to much more money on it.
cant understand if the timings correct, the cam sensor scopes ok and the ecu and loom have been replaced why i would still be having problems?

Any vauxhall techs on here with access to tis2web who could check for any bullentines for this issue?

Any help would be much appreciated.

Thanks in advance..
James

[Steve H]

Timing is the usual issue given that you have already changed the sensors for genuine ones.

Are you able to scope the cam v crank sensor patterns? If you post it up I may be able to find a pattern to compare to.

[Zener]

Steve H said:

Timing is the usual issue given that you have already changed the sensors for genuine ones.

Are you able to scope the cam v crank sensor patterns? If you post it up I may be able to find a pattern to compare to.

This ^ may be a cam to crank sensor correlation issue , 2 channel scope minimum

[overlandimpulse]

Thanks for the reply. Unfortunately I only have a single channel scope :S I'll see if I can beg steal or borrow one. Will possibly try another crank sensor if that could be a possibility. I'll also check the wiring.

[Steve H]

If the scope pattern is ok at the ecu then wiring should be ok.

I have a feeling that there’s more than one tooth layout on the cams for M9R lumps depending on the exact engine number. Has it had this fault code from the start? Any chance it’s had an engine swap? Or head?

[overlandimpulse]

It has had the code since I have owned it. Judging by the state it was in I don't think it has but who knows to be honest. Do you know how many variations there are? Not that I fancy taking the cam cover off due to the injectors looking like they haven't been moved for a long while.
Thanks for your help.

[Steve H]

Not sure how many and you don’t need to take the covers off (fortunately!), just get the cam v crank trace and post it up.

[overlandimpulse]

Thanks Steve for your help. I'll go invest in a 2ch scope and get back to you.

[uncleluck]

When you say second hand loom? I’d double check the wiring starting at the plug for the cam sensor. May not be the same on this model but I’ve repaired a couple where the wiring was buggered not far from the plug.

If the timing is wrong don’t they throw coherence codes? (Sorry been a few years since I’ve worked on them)

[Steve H]

Not always, it’s French so just a cam sensor code is very possible. I’m assuming sensor and wiring are ok if the scope signal is good at the ecu.

[Megaflow]

A cam sensor fault means the signal it is getting from the sensor is missing or it is incorrect. Incorrect can mean the form of the signal os wrong or the timing of the signal is wrong.

Given that somebody has played a very expensive game or parts bingo at your expense, has the cam timing been checked to make sure it is correct?

[overlandimpulse]

Thanks for all the reply's so far. I have tested th cam wiring on the fitted loom which has tested fine. I have recently rechecked the timing incase it was out. It was still spot-on. Plus I would of thought it would have a slight running issue if timing was out? Could be wrong. Going to get hold of a 2ch scope and get the cam Vs crank pattern. I will also check how many lobes are on the end of the inlet cam incase it has had a wrong one fitted. Just annoying as can't get to the bottom off it!

[overlandimpulse]

Here is the cam signal I scoped out 1second time base running at idle. Ignore the fuzzy vcc line as it's a cheap scope.

[Megaflow]

overlandimpulse said:

Thanks for all the reply's so far. I have tested th cam wiring on the fitted loom which has tested fine. I have recently rechecked the timing incase it was out. It was still spot-on. Plus I would of thought it would have a slight running issue if timing was out? Could be wrong. Going to get hold of a 2ch scope and get the cam Vs crank pattern. I will also check how many lobes are on the end of the inlet cam incase it has had a wrong one fitted. Just annoying as can't get to the bottom off it!

Apologies for asking about the basics, but lots of people forget to check them. If it was only a tooth out the difference in how it runs would be very small, but the ECM would pick it up.

[overlandimpulse]

No offence taken. Sometimes we forget the basics and need to be told how to suck eggs from time to time. Unless my timing tools are wrong (bought for this engine) then the timing is spot on. Thanks for your input.

[Megaflow]

I just had a quick google and this looks like it could be connected if the camshaft sensor uses a similar connector, sometimes they do.

http://www.partinfo.co.uk/files/Cambiare%20Tips%20...

[stevieturbo]

overlandimpulse said:

Here is the cam signal I scoped out 1second time base running at idle. Ignore the fuzzy vcc line as it's a cheap scope.

The signal looks clean...but no idea if its the right signal, or at the right time/intervals....although if it's the original wheel in the engine then no reason it should not be correct. As for timing, you need both crank and cam, and a comparison waveform to view them against.
Would be even better with a scope trace of cyl1 compression for an actual baseline reference too....3 channel scope and suitable pressure transducer ? lol

But simple basic first steps.....

Is this warning light always on ? can the fault be cleared ? how soon does this fault re-appear ? etc etc

[Colin Frampton]

Did you ever solve your problem as I have the same problem I have tried everything.