DTC P0505 Idle Control System Malfunction; DTC P0511 Idle Air Control Circuit: Description
The Idle Air Control (IAC) valve, of 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.
DTC DETECTING CONDITION AND TROUBLE AREA
| DTC No. | DTC Detection Conditions | Trouble Areas |
|---|---|---|
| P0505 | Engine idling speed continues to vary greatly from target idling speed (2 trip detection logic) |
|
| P0511 | Open or short in IAC valve circuit (1 trip detection logic) |
|