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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid) >> DTC Diagnosis >> DTC P1506: - Idle Air Control (IAC) OVERSPEED Error

DTC P1506: - Idle Air Control (IAC) OVERSPEED Error

DTC P1506: - IDLE AIR CONTROL (IAC) OVERSPEED ERROR

Description:  This DTC is set when the powertrain control module (PCM) detects an engine idle speed that is greater than the desired RPM.
Possible Causes: 
  • IAC circuit short to GND
  • 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 .
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