DTC P1506: Idle Air Control (IAC) OVERSPEED Error

P1506 - IDLE AIR CONTROL (IAC) OVERSPEED ERROR

Description:	This DTC sets when the powertrain control module (PCM) detects an engine idle speed that is greater than the desired RPM.
Possible Causes:	IAC circuit short to ground Damaged IAC valve IAC valve stuck open Intake air leak after throttle body Vacuum leaks Damaged EVAP system
Diagnostic Aids:	Disconnect the IAC valve and look for little or no change in engine RPM as an indication of a stuck or damaged valve.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to PINPOINT TEST KE .