Astra H 1.3 Cdti: Addressing P0243 Boost Pressure Regulation Error & Power Drop at Low Revs

Question

Hello,
I have a problem with the recharging process - there is a sudden drop in the measured value. After a few such peaks down, error P0243 boost pressure regulation appears. Control deviation negative. Turbine already replaced, MAP sensor new, pressure regulator too.

3piroman666 · Answer

Hello.
Airtight system? Turbine replaced with a used one or regenerated? Check that the turbine bar is not cutting and that the control cables are not worn somewhere, for example. The EGR valve may also jam and be opened then there will be no recharging.
Best regards.

mc2_ · Answer

Hi. Airtight system? Tight. Turbine replaced with a used one or regenerated? Regenerated, already second from another specialist. Check that the turbine bar is not cutting and that the control cables are not worn somewhere, for example. The EGR valve may also jam and be opened then there will be no recharging. It's all checked. I am most surprised by this peak down. This is the first time I see something like this ...

3piroman666 · Answer

Nom, this peak can be a falsification, this is not the moment where the error occurs, as I understand correctly, the red diagram is the pressure that is to be and always occurs after the shadow is exceeded, as if the turbine would let go. Is there a turbine with a geometry change or a relief valve? Someone did not accidentally spin the barbell at the turbine and it is not badly adjusted? because she is late and then breaks through as if there was something wrong with the control itself

adrian1201 · Answer

And something was not buried in the software sometimes?

mc2_ · Answer

Rather not, they updated the soft in the ASO to rule it out. We suspected that the pressure was too high, so after adjusting the barbell the peaks stopped appearing, but after 400 km the error returned again. I'm waiting for the patient and we'll see, but you can see the problem is still ...

3piroman666 · Answer

First, see if the same error continues and it is still about the boost pressure, if the peak has stopped appearing, you can see it was probably incorrectly set after regeneration, from experience I will add that if someone has already turned the regulation on the car or during regeneration it was incorrectly set, the correct regulation on the car it may take a while, it is difficult to correctly hit one turn of the nut and a test drive from the computer and observation of the parameters, maybe the turbine is still incorrectly set and reloads under some conditions while driving.

mc2_ · Answer

The peak is gone but the turbine is still reloading. Same error. I tried to trigger it and finally succeeded once at full throttle from 1st to 3rd gear. During normal use, it appears after a mileage of 300-500 km, I suspect that only then the driver registers the charging discrepancy long enough to save the error.

tzok · Answer

Adjusting the barbell only on the machine, turning it in the car is asking for problems. With these peaks, the first thing I would do is hook up the pressure gauge and check if they really are. If they were, I would bet on a cracked manifold - above some pressure the crack opens and works like a bleed-off valve (but it would whistle). In my Punta (the same engine), the problem was the connection of the exhaust gas cooler / EGR with the intake manifold (such a corrugated aluminum tube). The second option is a clogged catalyst.

mc2_ · Answer

Replacing the driver partially reduced the problem. But charging wasn't perfect anyway ...

[Solved] Astra H 1.3 Cdti: Addressing P0243 Boost Pressure Regulation Error & Power Drop at Low Revs

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