Thread: Restricted Performance Event

Does the device have 2 hoses attached? I haven't found a picture of the valve but I expect it is the solenoid that supplies vacuum to the turbine shut-off valve that shuts-off the exhaust side of the turbo which presumably uses 2 hoses. That valve is operated either on or off (not PWM) as the exhaust side is either fully open or fully closed.

Edit: No, it is just a pressure sensor.

From the D4 WSM. It appears that I had the inlet and exhaust solenoid operation reversed - inlet open/shut and exhaust variable.

Originally Posted by LRD414

Learnt a few things from a restricted performance event recently.
MY14 3.0L with 77,000km at time of fault.

Restricted Performance alarm came up with red triangle on dash and noticeable loss in power. Wasn’t towing or working hard, just driving on a slight uphill at around 60kph. Able to reset by an off/on ignition cycle and it didn't return. Interestingly no faults seemed to be logged when read with iiD, either when the alarm was active or after off/on ignition cycle.

Dropped it to dealer with that explanation and was advised later that day of an intercooler hose "distorted" (not split). I didn’t get to see the hose or speak to the tech, so have no idea what is meant by distorted. I didn't notice anything odd about the hose that night, albeit when looking with the engine off. I did also have a look to see if the cracked manifold issue was present and found nothing wrong before taking it to dealer. The hose was diagnosed via mass air flow related fault codes that were not picked up by my iiD tool but were read by the SDD system (dealer’s diagnostic system).

I queried Gap about the iiD non-reading and got a response back overnight. There is an iiD menu setting where you activate more of the available fault types. These are not set to "read" by default because certain types are effectively false positives that may occur once only and then disappear from the system. However if I had activated the “Pending” faults in the iiD menu it would have almost certainly matched the SDD reading, noting that you can’t test this scenario unless you have an active fault event. This is a feature of the iiD of which I was unaware that is clearly worth understanding for issues like this and another example of great service from Gap.



The logged fault codes were P006A-00, P1247-00, P00BD-07 and P0235-94.

Interestingly these codes match exactly with what others have reported when the issue was a sticky secondary turbo isolation valve (compressor shut-off valve), resolved by freeing-up the valve actuator shaft of dirt & grime. P1247-00 is boost pressure not achieved and P0235-94 is boost sensor unexpected operation.

I think lack of boost is also feasibly caused by a split or faulty hose as per dealer diagnosis and I haven’t had a reoccurrence but only time will tell as it’s also feasible that the isolation valve has freed up somehow. I know where to look and check the isolation valve thanks to an old thread from when Graeme had the issue, so I might have a look at the valve just for peace of mind.

Regards,
Scott

Hi there, want to confirm and give my thanks for the solution here.
Got the same codes exactly on my iCarsoft (no final digits however but that's way much better than having nothing), namely:
P006A, P00BD, P1247, P0235 and sometimes after fault reset getting also P010B.
Been cleaning MAF and MAP sensors using the CRC cleaning spray but nothing changed. Want to underline that resetting the faults and not moving the car was getting me one only fault that is P006A, no matter I revved it above 4000 rpm; as soon as I took the car out the restricted performance message with the rest of the faults were coming up with the transmission shift to 2nd gear.
Anyways, long story short, found out this thread which looked identical to my issue, got under the car, removed the plastic cover on the right front side (looking from inside the car) and get access to the isolation valve. As access is not so good without lifting the car, was taking out the 3 mounting bolts and remove the lower rubber hose just to verify if there is oil collecting. Good news just few drops there. So once out of the lower hose, the valve can somehow be rotated and get access to the vacuum push rod. I could feel it was not completely stuck but it didn't travel the complete stroke. So giving it some squirts of wd 40 and pushing it both directions it started to move easier until it could travel from end to end. Gave some more squirts, install back and took it for a ride uphill...no faults, throttle very responsive felt all the horses underneath. What a sensation!

My sincere thanks for the wealth of info here which is really helping!

Originally Posted by Valer

Hi there, want to confirm and give my thanks for the solution here.
Got the same codes exactly on my iCarsoft (no final digits however but that's way much better than having nothing), namely:
P006A, P00BD, P1247, P0235 and sometimes after fault reset getting also P010B.
Been cleaning MAF and MAP sensors using the CRC cleaning spray but nothing changed. Want to underline that resetting the faults and not moving the car was getting me one only fault that is P006A, no matter I revved it above 4000 rpm; as soon as I took the car out the restricted performance message with the rest of the faults were coming up with the transmission shift to 2nd gear.
Anyways, long story short, found out this thread which looked identical to my issue, got under the car, removed the plastic cover on the right front side (looking from inside the car) and get access to the isolation valve. As access is not so good without lifting the car, was taking out the 3 mounting bolts and remove the lower rubber hose just to verify if there is oil collecting. Good news just few drops there. So once out of the lower hose, the valve can somehow be rotated and get access to the vacuum push rod. I could feel it was not completely stuck but it didn't travel the complete stroke. So giving it some squirts of wd 40 and pushing it both directions it started to move easier until it could travel from end to end. Gave some more squirts, install back and took it for a ride uphill...no faults, throttle very responsive felt all the horses underneath. What a sensation!

My sincere thanks for the wealth of info here which is really helping!

I have these exact error codes, I checked the csov and was unable to move valve arm as freely. Is it meant to travel by hand? Will have another look tomorrow on the bench. I know my csov is with the newer pin without the bolt - so corrosion is unlikely.

With the valve stuck open, did you hear suction sound around the air intake box/area upon acceleration?

Originally Posted by Valer

Hi there, want to confirm and give my thanks for the solution here.
Got the same codes exactly on my iCarsoft (no final digits however but that's way much better than having nothing), namely:
P006A, P00BD, P1247, P0235 and sometimes after fault reset getting also P010B.
Been cleaning MAF and MAP sensors using the CRC cleaning spray but nothing changed. Want to underline that resetting the faults and not moving the car was getting me one only fault that is P006A, no matter I revved it above 4000 rpm; as soon as I took the car out the restricted performance message with the rest of the faults were coming up with the transmission shift to 2nd gear.
Anyways, long story short, found out this thread which looked identical to my issue, got under the car, removed the plastic cover on the right front side (looking from inside the car) and get access to the isolation valve. As access is not so good without lifting the car, was taking out the 3 mounting bolts and remove the lower rubber hose just to verify if there is oil collecting. Good news just few drops there. So once out of the lower hose, the valve can somehow be rotated and get access to the vacuum push rod. I could feel it was not completely stuck but it didn't travel the complete stroke. So giving it some squirts of wd 40 and pushing it both directions it started to move easier until it could travel from end to end. Gave some more squirts, install back and took it for a ride uphill...no faults, throttle very responsive felt all the horses underneath. What a sensation!

My sincere thanks for the wealth of info here which is really helping!

Hi there,

did the fault re-occur at some point or was it really only the sticking rod / flap?

Cheers,
Matt