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Possible causes Electronic Throttle Control System (ETCS). Air induction system PCV hose connection What does this mean? Tech notes The is a factory service bulletin for the following Toyota vehicles: 2005 and 2009 Toyota Avalon 2007 and 2010 Toyota Camry 2008 and 2009 Toyota Highlander 2006 and 2009 Toyota RAV4 2007 and 2010 Toyota Sienna 2009 Toyota Venza Toyota Factory Service Bulletin OBDII Code P0505 User Submitted Video What does this mean? When is the code detected? The ECM regulates the idle speed by opening and closing the throttle valve using the ETCS. The ECM concludes that the idle speed control ECM function is malfunctioning if: 1) the actual idle RPM varies more than the specified amount five times or more during a drive cycle, or 2) a learning value of the idle speed control remains at the maximum or minimum five times or more during a drive cycle. The ECM will turn on the MIL and set a DTC. Example: If the actual idle RPM varies from the target idle RPM by more than 200* rpm five times during a drive cycle, the ECM will turn on the MIL and will set a DTC. Possible symptoms Engine Light ON (or Service Engine Soon Warning Light) Engine hard to start Rough or erratic idle speed P

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