For Shop Owners

P0505 TOYOTA - Idle Air Control System

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?

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

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

P0505 TOYOTA Description

The idle speed is controlled by the Electronic Throttle Control System (ETCS). The ETCS is composed of the throttle motor, which operates the throttle valve, and the throttle position sensor, which detects the opening angle of the throttle valve. The Engine Control Module (ECM) controls the throttle motor to provide the proper throttle valve opening angle to obtain the target idle speed.
OBDII Code P0505 Toyota - Idle Air Control System -

P0505 TOYOTA Information for specific Toyota models

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P0505 TOYOTA Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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