Evening

I have brought the caravan down to Perranporth and have broken down 9 times today.
All at Radom times sometimes an hour in between sometimes 3 minutes.
Restricted performance, basically no power. No brake assist and stability warnings on dash.
Had to coast to a full stop, then stop and restart, all good for a while then Bong.
I have a code u0401-68(a

I need to get this sorted before I go home, losing power at 60mph isn't pretty!

top hoses? ... - .- -.




Y. O. L. O.
.

Thanks Stan but I changed them 6months ago.

No brake assist and no stability flashes up on the dash.

Removed the top two hoses yesterday but they're in perfect condition.
Strang thing is it's been fine with the short journeys I've taken over the last few days.
I'm thinking it's only happening once the engine is hot and under heavy load.

Description
Manifold absolute pressure (MAP) sensor/right-hand turbocharger boost sensor correlation - signal amplitude less than minimum

Meaning
The turbocharger boost pressure the engine ECU (PCM) is seeing is less than the minimum it was expecting. So the turbo is underboosting.

Causes
Intake air system fault
Turbocharger mechanical fault
Oil ingestion into manifold
Resolution
Check the intake air system.
Check the turbocharger mechanical condition and operation.
Check for oil being drawn into the intake manifold.
Rectify as necessary.
Using a data logger function, monitor the turbocharger actuator position and command the actuator to 5% pulse width modulated (PWM), then 95% pulse width modulated (PWM) in 5% steps. Check the results. There should be a smooth curve between the minimum and maximum values. If not, install a new turbocharger.
Clear the DTCs and test for normal operation.
Notes
May be sticky turbocharger actuator arm?

Thanks Gary

I did notice a small amount of oil inside the hoses, do you know if this is normal?
Would it be worth cleaning the map sensors?

Worth a try I hope its not the Turbo itself...

G

Thank you

I've been trying to replicate the fault all day but nothing.........

Car full of passengers and a dog, top speed, up steep inclines, working the engine, but nothing.

Strange

Happened again last night.
I'm not looking forward to towing the caravan home tomorrow.
Watching the live values, should the turbo boosts both be exactly the same at idle?

Click image to enlarge