407 Cruise Control Fault?

[PUG407FV09]

Hi just found this great forum, need some advice I have been having issues with cruise control, it will work at low speeds but anything over 50mph it will not set. If you put the car under load like going up hill it cancels. Sometimes if you turn the car off then on it may work. Had the AA out and the following codes were diagnosed p0569 and p0299.

What’s do you guys think is the issue?

The car is a 407 09 plate 1.6 Hdi ST

I’ve read all sorts on heat and to be honest I am more confused.

Thanks in advance

[GiveMeABreak]

Pop your VIN up here so I can see exactly what options and engine ECU you have.

[PUG407FV09]

Hi thanks for the reply

The vin is:

VF3**************[VIN obfuscated, can be read by forum staff]

[doctle]

Welcome to the best forum on the internet! Sometimes we even talk about cars!

[GiveMeABreak]

Ok, so your cruise control will be deactivated whenever there is a speed anomaly. In this case, seeing as you have an associated fault with the turbo pressure, the engine ECU has detected an issue and is cutting off the cruise as a safety precaution.

The P0569 fault means there is a difference between the actual vehicle speed and the vehicle speed requested.

Suspect areas are the BSI or the Engine ECU. But don't panic just yet, because it could simply mean there is an associated fault that is causing the engine ECU to switch it off - and in this case the next fault may well be responsible as per the following table. As you can see from the "Down Grade Modes if Fault Present", section, the third on this list specifically deactivates the cruise control - so this is why it is disengaging. So focus on the P0299 fault below and the other fault should go.

Fault code	P0299
After sales description of the fault code	Turbocharger pressure signal: Pressure too low in relation to the reference value
Description of the diagnostics	Difference negative for 5 seconds, between the turbo pressure reference and the measured turbo pressure: The pressure measured is lower than the reference, around 300 mbars for an engine speed above 2500 rpm
Conditions of activation of the diagnostics	Consult the associated contexts for the Pcode forwarding conditions In particle filter regeneration with engine speed above 1800 rpm Not in particle filter regeneration with engine speed under 1500 rpm
Conditions of disappearance of the fault	Driving for 5 min with several full load accelerations for 10 seconds
Down-grade modes if fault present	Use of the flow calculated Cutting of the EGR butterfly (turbo air cooler) EGR valve and bypass butterfly (inlet air heater) in all operating modes Cutting of cruise control Change to "easy move" torque invalid (Deactivation of automatic mode for the electronic parking brake)
Switching on of the warning lamp and/or warning message	-
Main customer complaints likely	Lack of power Noise Smoke from the exhaust
Suspect areas	Air meter restricted Clogged air filter Obstacle obstructing the air passage Air lock between compressor and engine Turbocharging pressure sensor Turbocharger position copy sensor Vacuum problem Variable geometry of the turbocharger jammed in the "minimum turbo" position Faulty turbocharger

[PUG407FV09]

Marc

Thank you so much, I’ve quickly read this at work and I will digest when I get home.

Really appreciate your reply, I will let you know how I get on

Cheers

[PUG407FV09]

Hi Marc

I have changed the air filter as it was in a terrible state, I think the duct had disconnected at some point... still has what seems to be the original filter despite a main dealer service last year (ford)

I have checked for leaks and the waste gate seems to move the vanes ok, however it does not hold pressure when using a syringe, it will pull it down but then release. Put the syringe on your finger and it won’t wet go.

Would this cause P0299 under boost?

Thanks.

[GiveMeABreak]

Here are the components of the air supply for your engine (DV6TED4) 110 with PEF.

Reference	Designation
a	Coolant Inlet
b	Coolant Outlet
(1)	Exhaust Gas Recycling (EGR) Regulation Electrovalve
(2)	Air Cleaner
(3)	Air Flow Meter - Air Temperature Sensor
(4)	Vacuum Reservoir
(5)	Turbocharging Pressure Regulation Solenoid Valve
(6)	Exhaust Gas Manifold
(7)	Catalytic Converter - Particle Filter (FAP)
(8)	Air/Air Heat Exchanger
(9)	Butterfly Double Air Metering Device
(10)	Exhaust Gas Recycling (EGR) Heat Exchanger
(11)	Air Inlet Manifold
(12)	Turbocharger

It could be that the turbo solenoid electrovalve (item 5) is not creating sufficient vacuum. These have a cap on the end with a filter inside that can become blocked, restricting the vacuum. You can try taking it off and cleaning the filter.

Here's a video showing the procedure - the sound quality is awful - but shows you what I'm talking about:

[PUG407FV09]

Thanks again.... hopefully when I get this resolved I can post and help others

How’s the best way to access it?

[GiveMeABreak]

It's at the back of the engine - item (6):

[GiveMeABreak]

Darren, with reference to your PM and the details of the diagnostics - the P0299 error is as listed above in my explanation a couple of posts back.

How they can declare you need a new turbo from this one fault without further testing is beyond me, given that the fault clearly lists several suspect areas and the Turbo itself is last on the list! They do suspect the Turbo solenoid (item (5) on the table a few posts above). They should of been able to test the vacuum pressure - they should have a tool for that - which would of determined if the vacuum solenoid was at fault or not.

Turbos are not cheap and frankly unless they can tell you how they come to that conclusion without proper tests, then it's no wonder they didn't want you to have a copy of the diagnostic report - which is the same as we would get if you were running the same global test from Diagbox - it would seem that is all they have done and are declaring a new turbo!

It's really sad to be honest that they have run that global test and that is all...

Any decent workshop would have tested the vacuum circuit, tested and cleaned the turbo solenoid and then seen if that has improved matters before even considering the turbo itself.

[PUG407FV09]

Hi Marc

Thank again for the quick reply. I am going to try and replace the vacuum solenoid today.... I am hoping I can access it by removing the air box.

I am really disappointed in the main dealer as like you say all they have done it plug the car in.

One final thing, you mentioned turbo is 5th on the list??? Where is this in the report?

Many thanks Darren

[GiveMeABreak]

Sorry, it’s number 5 on the diagram I posted that shows the Turbo in the Air Circuit component diagram, but 9th on the list under ‘Suspect Areas’ of the P0299 fault information I posted several posts above when you initially reported the fault.

[PUG407FV09]

Good news, I’ve purchased at solenoid from Euro parts for £48 and after a few hours and some sore arms it seems to have worked... cruise works and there’s seems more power. I can’t thank you enough for your advice and guidance.


Much appreciated

Darren

[GiveMeABreak]

Excellent - that's £970 saved on a new turbo ex fitting then....

...ever get the feeling you now want to drive back to the dealer and rub it in a bit? Dopey bu**ers.