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  #1  
Old 31st January 2008
Mart Mart is offline
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Unhappy Faultcode P0234

Hello,

Driving on the highway my car suddenly had the motormanagement light burning.
The power war decreasing and the motormanagement went in savemode.
After reading the motormanagement the faultcode P0234 came out.
It has to be something with load pressure negative.
It can be the turbo, the intercooler, leakage off some hoses etc.
Who can help me with selecting the right problem.

greetz, Mart
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  #2  
Old 31st January 2008
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Overboost fault code. Ummm try resetting the code if the code appears again. I can't really help you.

This is probably ECU related.
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  #3  
Old 31st January 2008
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Hello got boost,
thank you for your reply.
The faultcode is resettet by the garage and came back.
It suddenly came without any previous warning or defect.
I have read allready some things about it on internet, it can be a wide range off problems mostly something with the turbo or the hoses or intercooler.
Because the car produce a lot off smoke now it appears to be something with airleakage in the turbo circuit.

greetz mart
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  #4  
Old 31st January 2008
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Well, it seems the boost pressure sensor is trying to tell you something. Perhaps it's decided to rest in peace or it indicates a problem in a related component.
This sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by turbocharger output, engine speed, accelerator pedal input, air temperature, and barometric pressure (BARO). The sensor has got a diaphragm which is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. This translates in electrical resistance, the ECM interprets it accordingly and ... voila.

You could inspect the sensor for an incorrectly routed harness or if the harness is too close to solenoids or relays just in case; although I doubt you'll come with up something there.
I suggest you have the sensor itself checked, esp. the boost pressure (kPa) in relation to the BARO.
Also, look for exhaust leaks before the turbocharger, exhaust restrictions after the turbocharger or leaks in the charge air cooler.
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  #5  
Old 31st January 2008
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First, has the car been modified, such as with a manual boost controller?

If you are getting overboost, it suggests your wastegate is not opening as requested. I would start by checking connections (both electrical and vac line) to the boost control solenoid. Solenoids can get sticky, but this will be difficult for you to verify. Wastegates can also stick, but this problem is very rare.

The excess smoke is probably related to A/F mixture problems secondary to overboost.

Has the car gone into limp mode? Is this what you mean by "save mode"?
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  #6  
Old 31st January 2008
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What color is the smoke....
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  #7  
Old 1st February 2008
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Default P0234

Hello,

The problem is solved in the Saab garage within 10 minutes. The intercooler hose was ripped. There was already a modified one places but now on another spot. price including mounting 75 euro.

Thanx for all help and reply's.

Mart
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Old 1st February 2008
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Quote:
Originally Posted by Mart
The intercooler hose was ripped.
Ripped to open a hole, or just a flap with a tear?
Just wondering how big a hole you need to throw things off seriously.
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  #9  
Old 1st February 2008
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This is rather off topic, but I've been meaning to ask: Which term is more common/preferred mostly? "Intercooler" or "charge air cooler"?
Is it a language-dependant (US or British English) sort of thing? Just like "hood" and "bonnet"?
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  #10  
Old 2nd February 2008
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Quote:
Originally Posted by 3rd stone from the sun
This is rather off topic, but I've been meaning to ask: Which term is more common/preferred mostly? "Intercooler" or "charge air cooler"?
Is it a language-dependant (US or British English) sort of thing? Just like "hood" and "bonnet"?
Seems as if it's a language-dependent sort of thing...
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  #11  
Old 2nd February 2008
Mart Mart is offline
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Default Faultcode P0234

Hello,

In the hose was a cut off 2 cm long.

I think in the english language it is intercooler, see fot the right thing the servicemanual.

Thanks for the help.

greetz Mart
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