OBDII Code List

P0511 SCION - Idle Control System Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3   
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Possible causes

  • Open or short in IAC valve circuit
  • IAC valve stuck or closed
  • ECM

Tech notes

Before replacing any parts, try cleaning the Idle air control valve.

When is the code detected?

The Engine Control Module (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 engine light and set P0511 code.
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

P0511 Scion Description

The Idle Air Control (IAC) valve, a rotary solenoid type, is located under the throttle body. Intake air bypassing the throttle valve flows into the IAC valve through a passage. The valve regulates the volume of intake air that bypasses the throttle valve and allows the engine idling speed to be controlled. The IAC valve is used by the ECM to perform idle-up and its feedback signal is used as one factor in target engine idling speed regulation.
OBDII Code P0511 Scion - Idle Control System Malfunction -

P0511 Scion Information for specific Scion models

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P0511 SCION Comments

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