Marco315

5 minutes ago, coupe4 said:

hi mark,this happened to a pal of mine with a 2007 Q7,a uk company had done work on his ecu and when he got it back and fitted it he called them and they sorted all the faults while he was on the phone.this might be worth a try?greg

Thanks mate. I rang them yesterday but apparently they can’t help. Unfortunately I’m probably going to have to sell the car, I just can’t justify spending anymore on it. 

 

So here is the story so far…

 

I had an auto electrician come and have a look at the car and he said that the ECU was knackered and that he was almost positive as soon as I got my ECU cloned the car would start up… now I’ve had my ECU cloned and fitted the new ECU and now it’s throwing the faults up as below. Now the ones which I think are causing the problem is the P1040 & P1042 but the problem is I aren’t getting a voltage to the plugs on the injectors. Now I can’t find a lot on line about this but what I can find is everyone pointing to the ECU… but my ECU can’t be the issue as I’ve just had it cloned 🤦🏼‍♂️. Anyone shed any light on it or help in any way? 

 

[Friday,29,September,2023,10:21:18:00009

 

Nope literally just the seat controls and the fact the car won’t start… but that’s it

Anyone have any idea what this ONBOARD POWER SUPPLY CONTROL MODULE UNIT ECU 4F0907280E does??? I know the other one is for the gearbox but don’t know what this one does… 

 

basically I’ve found a broken wire on the 4 pin plug which goes to the seat controls on the drivers seat so I repaired the wire but none of the seats will work still. I have 12v to the 2 x red/blue wires on the 4 pin plug to the controls but nothing after that. Anyone have any idea what could have blown or be stopping the seats from working? Only found a broken wire on the drivers seat but both front seats won’t move.

7 hours ago, Bigdave1230 said:

I’m inclined to think it’s possibly an ecu fault. I suspect when you loosen an injector pipe and crank that you’ll get a diesel but might seem a little bubbly making you think it’s drawing air in and lead you into an expensive world of changing components on the fuel system. I would look for a local independent mobile auto electrician to come and test the ecu etc. Should only cost a callout and be less than £100 and might save a lot of chasing. Alternatively you can send the ecu away to be checked/repaired 🤔 there used to be a company on the internet ecutesting.com that charged about £250 to repair/exchange them but if no fault was found then they refunded and sent back but you have to pay about £20 postage. I’ve had a similar fault like this before and it got very expensive to chase and sort. ( it was the ecu in the end but I only found this out after about 2k into it 🤦🏻‍♂️). Theres a post about it with all the symptoms somewhere earlier in the forum posts.

Thanks, I think I managed to find the old post and contacted the ECU place that you mentioned (cartech) they want nearly £700 for an ECU replacement and didn’t even respond when I messaged them. Even tried ringing and got no answer. I was only 15mins from the place yesterday and hoped to drop mine off and see if they could test it but they wouldn’t answer the phone so just came home

1 hour ago, snapdragon said:

When I had an '06 3.0 TDI, there was no tank in the pump. The lift pump was built into the HPDP.

You only need compression and fuel to start a diesel.  Can you undo a union on one of the injectors and crank to see if diesel leaks out. Should be a noticeable trickle from each?

Can you try a starting fluid such as Bradex Easy Start to see if it fires up for a second?

When cranking, can you feel pulses of gas from the exhaust?

What about the throttle that closes when you turn of the engine in the air intake, roughly  behind the left headlight, made of aluminium - can you visually inspect the flap?

When I had a DPF blocked in 2010, a specialist removed it from the ECU but hollowed out the pre-cat only by mistake, so the DPF became totally blocked but would still start easily, just no power once exhaust pressure built up.

It’s had a new throttle body fitted and I tried easy start but doesn’t change it. I will try cracking the injectors tomorrow but starting to loose any hope of it starting now and don’t want to destroy the brand new battery I’ve just fitted

2 hours ago, Bigdave1230 said:

Hi did the car cut out when driving or simply not start one morning? Did the glow plug light flash at any point?

Hi, I was told that it just cut out and wouldn’t start again. The glow plug light flashes every time I turn the ignition on now

5 hours ago, Steve Q said:

Are they connected to the ccm I wonder? 

Have you done a diagnostic check to see if any fault codes flag up? 

Yes done a diagnostic and nothing comes up regarding the seats. Checked all plugs and everything is plugged in

So I’m slowly slowly working through my Q7 which I’ve just bought and none of the front electric seats are working. All interior lights, windows etc work and everything else I can see works but just not the seats… is there a common problem here or anything to check? I’ve checked the fuses and it’s not any of them… just seams strange how both aren’t working

15 minutes ago, Stevey Y said:

Hi I think you will find thats the return to the tank looking at the middle picture I would say the infeed is the large banjo bolt to the right of the the pump, if you can't see the fuel moving through the return pipe that would suggest the lift pump, you will always see air bubbles in the clear pipe as thats the HPFP self bleeding and if the HPFP was getting fuel the bubble would move when cranking.

Steve.

Thanks for that. I’ve emailed a few garages today but heard nothing back as of yet. Got a funny feeling no one will want to touch it. Just hate to see it going to scrap if I can’t sort it. 

Should there be an air bubble in the top of this clear pipe? It goes to the HPFP I think… but when I try and start the car the air bubble moves but the pipe doesn’t fill with fuel as I would expect it too…

49 minutes ago, Magnet said:

Hello Mark,

Regrettably, the back and front of this is that you must have already spent a comparative fortune in trying to sort this out on your own, and effectively got nowhere. 
Defeatist perhaps, but if it were mine, I would now simply entrust this to a trusted local diesel specialist, and at least get nearer to the root cause, before you throw more good money after bad. 
Kind regards,

Gareth. 

Hi Gareth,

I appreciate that and I am tempted. It’s just getting it to a garage and the hill that comes with it. It’s getting to a point where I don’t know if to just cut my losses but I’m the person that really can’t let something go… my mindset is that nothing is impossible and it must be fixable… but at what cost 

Hi, all these faults keep appearing after I have cleared the faults. My thinking was that it’s maybe the DPF that’s blocked stopping the engine from starting so it doesn’t damage it but I just feel there is too many random faults for that to be the issue. I will try the fuel pump tomorrow and see how I get on. It’s annoying because I’ve removed the codes so many times and these just keep reappearing. I got a new ECU made because the old one was saying communication error but I’m unsure if the new ECU is even correct