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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 753 (Engine Controls - Powertrain DTC Charts & Descriptions - CNG, Flex-Fuel & Gasoline) >> Diagnostic Trouble Code (DTC) Charts >> P1504 - Idle Air Control (IAC) Circuit Malfunction

P1504 - Idle Air Control (IAC) Circuit Malfunction

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P1504 - IDLE AIR CONTROL (IAC) CIRCUIT MALFUNCTION

Description:  This DTC is set when the PCM detects an electrical load failure on the IAC output circuit.
Possible Causes: 
  • IAC circuit open.
  • VPWR to IAC solenoid open.
  • IAC circuit short to PWR.
  • IAC circuit short to GND.
  • Damaged IAC valve.
  • Damaged PCM.
Diagnostic Aids:  The IAC solenoid resistance is 6 to 13 ohms. Monitor the IAC PID duty cycle and/or voltage.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to KE: Idle Air Control (IAC) Valve STEP 2
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