Re: code P1549 - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: code P1549
Posted by Dean (more from Dean) on Fri, 20 Aug 2004 06:53:30
In Reply to: code P1549, joss, Fri, 20 Aug 2004 06:33:58
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The charge air mass flow has exceeded that requested by the ECU by 100mg/C. C = combustion charge
The ECU has also been taking the BPC valve to its lowest level at this time. So the ECU sees that it cannot control the boost.
A leak in the WG hose or an improperly adjusted SMBC perhaps?
Looks to be T7, T8 specific
This code will then cause the ECU to run at limited boost (600mg/C).
Over pressure evens with a T7 typically do not cause a CEL and do cause a limpy boost condition will self clear next startup. The WIS implies that this CEL code is self clearing to some extent, but perhaps three driving cycles or something like that.
All of this seems consistant with your:
http://www.saabnet.com/tsn/bb/9-3/index.html?bID=92062
When BPC's fail, its often to low boost. Check the BPC hoseS.
posted by 65.68.100...
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