P0505

DTC P0505
Blocked Idle Air Control Valve Drive cycle A:Signal out of range - above maximum.

DTC P0505
Blocked Idle Air Control Valve Drive cycle A:Signal out of range - below minimum.

Possible causes by suggested order of priority:
^ IACV Jammed.
^ IACV blocked.
^ IACV Incorrectly fitted.

IACV Jammed.
CHECK THE FOLLOWING:
^ Idle Air Control Valve mechanically jammed.
POSSIBLE FAULTS:
^ Idle Air Control Valve Faulty.

IACV Blocked.
CHECK THE FOLLOWING:
^ Idle Air Control Valve or pipework blocked.
POSSIBLE FAULTS:
^ Idle Air Control Valve Faulty.
^ Pipework or valve blockage.

IACV Incorrectly Fitted.
CHECK THE FOLLOWING:
^ Idle Air Control Valve fitted incorrectly (large air leak).
POSSIBLE FAULTS:
^ Idle Air Control Valve very loose.
^ Large air leak near idle air control valve.