P1507 FORD - Idle Air Control Under Speed Error

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?
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
  What does this mean?
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 persists, the IAC valve may need to be replaced.
  What does this mean?
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 Ford Description

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.

P1507 Ford Information for specific Ford models
Related Information
Repair Importance Level: 3
 
1=Low 2=Medium 3=High  
Repair Difficulty Level: 2
 
1=Easy 2=Moderate 3=Hard  
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