Fault code P006A-00

[v8sruleok]

Hi,

I have multiple codes coming up on my 2011 SDV6. I have had the car into a workshop lately, they pressure smoke tested the intake and found no leaks, but didn't have time to fix the problem as I needed the vehicle for Easter towing duties.

I have just been reading some info on one of the Jag forums, and am pasting this quote,

"fault code P006A-00 ....... which refers to 'Mass Airflow Correlation. This fault code means that 1 bank of the engine has a different air pressure from the other bank".

I raise this because in RTFM I can find no reference to said fault, only faults P006A-21, and P006A-22.

The other faults I'm getting P0235-94, turbo boost 'A' circuit component failure, and P1247-00, turbo boost low.

Can you guys please confirm my info from Jag Forum is correct?

Do you think that I could still be looking at a cracked manifold?

I have visibly checked both manifolds and found no cracks in the usual places, removed the intercooler hoses and checked for leaks/splits, removed the shut off valve and checked for free movement of the butterfly and actuator, and inspected as many vacuum lines as reasonably accessible to do. I have not yet visibly checked any of the turbos, or the intercooler itself.

Running out of ideas now so any help much appreciated.

Thank you.

[justinc]

Check your MAF live values. I still reckon there is a manifold leak. Can you see ANY spits of soot or black specs on the underside of the acoustic cover??

[v8sruleok]

Tried to get some live values but every time we tried the vehicle would drop into "Restricted". What sort of numbers should I be expecting to see from the MAFs please? I will give that a check on my next test drive. Haven't had the cover on for months but it looks clean on the foam underneath. There is a tiny amt of oil mist on the 2nd injector pipe clamping nut LHS (it's adjacent to the breather tube which has a split boot which I have taped and cable tied tight for now). Thanks for yr info.

[DiscoJeffster]

Place white paper under the cover. Place it around the throttle body, intake manifolds etc. Go for a spirited drive. Check the paper for soot. That can help and is easier than a smoke test.
P006a is a correlation error - the
MAF has seen x amount of air which (without leaks) equals so much boost reported on the MAP sensor. When there is a leak the MAP reads lower than the corresponding MAF level. P006a reported. I’m an expert as I’ve had both manifolds and a throttle body split to cause the failure every god damn holiday lol

[v8sruleok]

DiscoJeffster, I know about yr issues, been reading about them in the quest to solve mine. A couple of weeks ago I put a clean white T-shirt across both manifolds and went for a drive and it came back as clean as it went out.....but maybe my driving wasn't spirited enough, I'll give it another go.

The relationship between MAF and MAP is something I need to work on. I did squirt them with Maf aerosol and swapped around a few months back, but I might just swap them back and see if it makes a difference.

I see that you are in my neck of the woods, thanks for yr reply.

[DiscoJeffster]

Apologies as I didn’t see the other two faults in your original post. Those are not similar in any way to my previous issues which leads me to think the 006a is not the primary issue.
Looking at other posts the compressor shut off valve gets a mention. Search the P0235-94 via google for a few posts on it.

[Eric SDV6SE]

I'll have to check my records at home, but that code and your cars symptoms sound like the air control valve may be sticking. This valve controls when the secondary turbocharger is activated and it works on the MAF sensor values.

Speaking from experience, when they stick it causes all sorts of issues. Easy to replace, just not cheap (about $1200)

[v8sruleok]

Thanks Eric,

I did some research last night relating to P0235-94 and the shut off valve looks a likely candidate.

Mine still has the original actuating arm assy but I can operate it manually from underneath with no binding in the mechanism apparant.

I removed the valve about a month ago and did a visual inspection of the butterfly and found nothing out of order, the whole thing was very clean inside and out and only a very small amt of oil came out of the lower hose assy at removal.

I maybe need to manually apply a vacuum to the diaphram module and see if the lever opens the valve.

Do you think that the error code could be triggered by the valve not opening (or closing) at the right time?

Cheers.

[Eric SDV6SE]

Definitely. There's also an air control solenoid that controls the variable vane primary turbocharger actuation. When that fails, it also throws up MAF error codes.

[LRD414]

..... I did some research last night relating to P0235-94 and the shut off valve looks a likely candidate.

Mine still has the original actuating arm assy but I can operate it manually from underneath with no binding in the mechanism apparant.

I maybe need to manually apply a vacuum to the diaphram module and see if the lever opens the valve...

In your other thread about a month ago there was suspicion re vacuum operation. Have you chased that through? Including the solenoid that controls the vacuum actuation? It is known to fail and is cheap to replace to eliminate as a cause. I carry a spare on remote trips for that reason.

Scott