Engine-Codes - Lincoln - P1507 LINCOLN

P1507 LINCOLN - Idle Air Control Under Speed Error

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1507 LINCOLN Possible Causes

  • Faulty Idle Air Control (IAC) valve
  • IAC valve stuck closed
  • IAC valve harness is open or shorted
  • IAC valve circuit poor electrical connection

How is the P1507 LINCOLN code repair?

Start by checking 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 connector's pins.

Tech Notes

The P1507 code means that the engine idle is out of factory specification. Sometimes the Idle Air Control (IAC) may have carbon built up. Disconnect the car battery, remove the valve, clean, re-install valve, and drive the vehicle for about 5 minutes with the headlights and A/C ON to get the idle relearned.
If the problem persistss, the IAC valve may need to be replaced.

What is the cost to diagnose the P1507 LINCOLN code

Labor: 1.0

The cost to diagnose the P1507 LINCOLN 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.
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When is the code detected?

The P1507 code sets when the Powertrain Control Module (PCM) detects an engine idle speed that is less than the desired RPM.

Possible Symptoms

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

P1507 LINCOLN 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.

More Information

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