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HOMESERVICE MANUALSMERCURY2011MARINER PREMIER, 2.5 7, AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS - DTC P0218 THROUGH DTC P0581 - (EXCEPT DIESEL & HYBRID)DTC P0506: IDLE AIR CONTROL (IAC) SYSTEM RPM LOWER THAN EXPECTED
2011 Mercury Mariner Premier, 2.5 7, AWD

DTC P0506: Idle Air Control (IAC) System Rpm Lower Than Expected

2011 Mercury Mariner Premier, 2.5 7, AWDSECTION DTC P0506: Idle Air Control (IAC) System Rpm Lower Than Expected
P0506 - IDLE AIR CONTROL (IAC) SYSTEM RPM LOWER THAN EXPECTED

For Vehicles With An Idle Air Control (IAC) Valve 
Description:  This DTC sets when the powertrain control module (PCM) detects an engine idle speed that is less than the desired RPM.
Possible Causes: 
  • IAC circuit open
  • Air inlet is plugged
  • B+ or VPWR to IAC solenoid open
  • Damaged or incorrect IAC valve
  • IAC valve stuck closed
  • VPWR to IAC solenoid open
  • IAC circuit short to voltage
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.
For All Others 
Description:  This DTC sets when the powertrain control module (PCM) detects an engine idle speed that is less than the desired RPM.
Possible Causes: 
  • Intake air restriction
  • Vacuum leaks
  • Exhaust restriction
  • Engine mechanical concern
  • Sludged throttle body
  • Damaged electronic throttle body (ETB)
  • Damaged PCM
Diagnostic Aids:  This DTC may be accompanied by other DTCs. Diagnose other DTCs first. If no other DTCs are present, inspect the intake air system for air restrictions, vacuum leaks, and damage. If no concerns are present, clear the DTC and carry out the key ON engine running (KOER) self-test.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Ranger GO to PINPOINT TEST KE .
All others GO to PINPOINT TEST HU .
RENDER: 1.0x

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