There is a factory service bulletin for the following Toyota vehicles:
2005-2009 Toyota Avalon
2007-2010 Toyota Camry
2008-2009 Toyota Highlander
2006-2009 Toyota RAV4
2007-2010 Toyota Sienna
2009 Toyota Venza
Toyota Factory Service Bulletin OBDII Code P0505
Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
The cost to diagnose the P0505 Toyota code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.
The idle speed is controlled by the Electronic Throttle Control System (ETCS). The ETCS is comprised of 1) the one valve type throttle body; 2) the throttle actuator, which operates the throttle valve; 3) the throttle position sensor, which detects the opening angle of the throttle valve; 4) the accelerator pedal position sensor, which detects the accelerator pedal position; and 5) the Engine Control Module (ECM), which controls the ETCS. Based on the target idle speed, the ECM controls the throttle actuator to provide the proper throttle valve opening angle.
The ECM monitors the idle speed and idling airflow volume to conduct Idle Speed Control (ISC). The ECM determines that the ISC system is malfunctioning if the Idle speed continues to vary greatly from the target idle speed.
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