2006 T5 2.5 AXD Engine Not Starting California Camper conversion.

[manfrotto]

Bypass Gold

Automatically remove immo through OBD2 plug in VAG group cars: AUDI, SEAT, SKODA, VOLKSWAGEN

shop.carlabimmo.com

Worth a try, but if the immobiliser shuts off the fuel supply via a solenoid, and the solenoid is faulty I suspect disabling the immobiliser wont show that up ?

 

[manfrotto]

re reading this thread, the VW dealer cleaned tank and fuel pump and tested. THEN refitted to vehicle. Could be red herring but did they test it AFTER it was re-installed. I would like to think they have some intelligence rather than just following a diagnostic script.

 

[manfrotto]

Has Ron Considered talking to a local VW independent Garage? Prior to having a VW VAN I had an Audi Q3 TDI, and am on their Forum. They have a list of recommended independent garages on the forum, and included in Cambridge is Audi, VW, Seat & Škoda Servicing Cambridge - Quattro-Tech
Just a thought.

 

[mmi]

Looks like as VW sells cylinder head as a fairly complete package.



Also it seems it will be soon on a clearance sale...

---

Per AXD (5-cyl 96kW variant) engine workshop manual AXD doesn't have DPF.
Also wiring diagram for AXD engine doesn't have G450 exhaust pressure sensor suggesting no DPF.
Before my T6 I had T5 & AXD engine and definitely no DPF.

However, DPF was onboard on T5 BNZ engine (also 5-cyl 96kW), from January 2006 onwards, as well on T5 5-cyl engine BPC (128 kW).

Well, it seems that there was a retrofit kit for DPF available.

 

[manfrotto]

Probably worth asking the guy who did the engine rebuild if a new head was installed then, especially if it is a known issue and repaired at VW's cost?

 

[T5Derry]

Not totally impossible - but as above would still expect run - at least on a few cylinders if not all.

AXD/AXE head cracks

www.vwt4forum.co.uk

Anyways, the above statement bothers me - there is no mention that this test have been redone. Neither it's not mentioned that do the injectors get the firing pulses? If the injectors receive the pulses it would eliminate nearly 100% issues on ECU side and it's accessories - immobilizer, sensors, etc. Need to measure both voltage and current.

Well, modern ECUs would do the analysis in their diagnostics but I'm not sure AXD ECU was at that level.

mmi: thanks once again.

I will be asking VW to run another diagnostic to ensure the injectors and pulsing both voltage and current.

my personal view, even if the head is cracked I'm sure it would still run, albeit rough, granted

Thanks.

 

[T5Derry]

Probably worth asking the guy who did the engine rebuild if a new head was installed then, especially if it is a known issue and repaired at VW's cost?

manfrotto

Ron purchased a full recon engine from Ivor Searle. it was fitted by a local garage 4 years ago, and has done a faultless 37,800miles. that was until this current issue arose. The thing I still cant get my head around is, it was running perfectly less than 45mins before it failed to start.

 

[PhillH]

manfrotto

Ron purchased a full recon engine from Ivor Searle. it was fitted by a local garage 4 years ago, and has done a faultless 37,800miles. that was until this current issue arose. The thing I still cant get my head around is, it was running perfectly less than 45mins before it failed to start.

Which to me is a electrical component failure

 

[PhillH]

Contact these guys and ask got a price to remove your immobiliser, cheaper than buy a ECU with immobiliser already off

âFOR VW T5 2.5 TDI AXD ECU PLUG & PLAY IMMO OFF 070906016 0281010732 | eBay

ECU is an electronic part which must be replaced with identical part numbers. by yourself. Short list of plug & play ECU's we can provide The product images shown are for illustration purposes only and may not be an exact representation of the product.

www.ebay.co.uk

 

[mmi]

it was running perfectly less than 45mins before it failed to start.

As all 5 injectors share a common ground return wire, it would have been a candidate for the blackout.

However,

Injector wiring loom cleaned and checked. All
Okay.

New ECU

 

[oldiebut goodie]

As all 5 injectors share a common ground return wire, it would have been a candidate for the blackout.

However,

We all know that some people's checks of wiring fail to check grounds. And the times people on forums say "they look ok" but don't actually check them electrically.

 

[mmi]

I will be asking VW to run another diagnostic to ensure the injectors and pulsing both voltage and current.

Just a note: it's a job for an oscilloscope to catch the pulses as the fuel injection burst is somewhere in 1-3 milliseconds at about 170 millisecond intervals for each cylinder (when cranking at 200 RPM).
It would be beneficial/essential to have an oscilloscope with a decent memory buffer to record a sample (of several pulses) in one go. Otherwise likely to see nothing.

 

[T5Derry]

Just a note: it's a job for an oscilloscope to catch the pulses as the fuel injection burst is somewhere in 1-3 milliseconds at about 170 millisecond intervals for each cylinder (when cranking at 200 RPM).
It would be beneficial/essential to have an oscilloscope with a decent memory buffer to record a sample (of several pulses) in one go. Otherwise likely to see nothing.

mmi
Please see below from the VW tech

2006 T5 2.5 AXD Engine Not Starting California Camper conversion.

https://shop.carlabimmo.com/bypass-gold Worth a try, but if the immobiliser shuts off the fuel supply via a solenoid, and the solenoid is faulty I suspect disabling the immobiliser wont show that up ?

www.t6forum.com

Just a note: it's a job for an oscilloscope to catch the pulses as the fuel injection burst is somewhere in 1-3 milliseconds at about 170 millisecond intervals for each cylinder (when cranking at 200 RPM).
It would be beneficial/essential to have an oscilloscope with a decent memory buffer to record a sample (of several pulses) in one go. Otherwise likely to see nothing.

mmi

See attached taken from an email I received from VW on 8/7/24, this was before they sent the injectors away for testing, then advising it needed a new set of injectors.

It looks as though they used an oscilloscope to test the original injectors and timing.

 

[mmi]

It looks as though they used an oscilloscope to test the original injectors and timing.

Yes, obviously the voltage was measured. Anyways, I'd like to believe the ECU monitors that the injectors ingest proper amount of current and would throw a fault code otherwise. That's what VW SSP 304 states for the ECU - page 11 in https://procarmanuals.com/pdf-online-vag-ssp-304-electronic-diesel-control-edc-16/

Back to square one - anyone sniffed the exhaust after/while cranking - any diesel smell?

 

[manfrotto]

Hi DerryT5
Did you end up getting to the bottom of the Issue with Ron's van?

 

[T5Derry]

manfrotto Hi.

VW have not managed to get it running inspite of all the new bits they’ve fitted and the other jobs they’ve done.
I am due to pay their invoice £4.7k tomorrow and arrange recovery back to Ron’s next Tuesday which will be 6month and 1 week since it was delivered into them.

The next thing they wanted to try was to replace the cylinder head, at around £2.5k. VW would not guarantee it would cure the problem. So we agreed to draw the line under it.

I don’t really know the next steps, apart from getting it back home to Ron.

Regards
Derry