OBDII Code List

P1504 MERCURY - Intake Air Control Circuit Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?

P1504 MERCURY Possible Causes

  • Faulty Idle Air Control Valve
  • Idle Air Control Valve harness is open or shorted
  • Idle Air Control Valve circuit poor electrical connection
  • Faulty Powertrain Control Module (PCM)

First diagnose P1504 MERCURY code

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

Cost of diagnosing the P1504 MERCURY code

    Labor: 1.0

    The cost of diagnosing the P1504 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

When is the P1504 MERCURY code detected?

Powertrain Control Module (PCM) has detected an electrical load failure on the Idle Air Control Valve (IACV) circuit.

P1504 MERCURY Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1504 MERCURY Meaning

The Idle Air Control Valve (IACV) valve assembly controls the engine idle speed and provides a dashpot function. The IAC valve assembly meters intake air around the throttle plate through a bypass within the IAC valve assembly and throttle body. The Powertrain Control Module (PCM) determines the desired idle speed or bypass air and signals the IAC valve assembly through a specified duty cycle. The IAC valve responds by positioning the IAC valve to control the amount of bypassed air. The PCM monitors engine RPM and increases or decreases the IAC duty cycle in order to achieve the desired RPM.
OBDII Code P1504 MERCURY - Intake Air Control Circuit Malfunction - Engine-Codes.com

P1504 MERCURY More Information

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