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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 93 (Engine Controls - Powertrain DTC Charts & Description (Except Diesel & Hybrid)) >> Diagnostic Trouble Code (DTC) Charts And Descriptions >> DTC P1506: Idle Air Control (IAC) Overspeed Error

DTC P1506: Idle Air Control (IAC) Overspeed Error

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. 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
  • Air intake leak after throttle body
  • Vacuum leaks
  • Failed 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 KE: Idle Air Control (IAC) Valve STEP KE14.
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