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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2090 (Engine Controls - Powertrain DTC Charts And Descriptions (Except Diesel & Hybrid)) >> DTC Diagnosis >> P1506 - Idle Air Control (IAC) OVERSPEED Error

P1506 - Idle Air Control (IAC) OVERSPEED Error

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
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   refer to PINPOINT TEST KE .
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