P1509 - Idle Air Control Valve System High RPM

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?
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Possible causes
- Faulty Idle Air Control Valve
- Idle Air Control Valve harness is open or shorted
- Idle Air Control Valve circuit poor electrical connection
What does this mean? What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1509 Description

The target idle speed is in the Engine Control Module (ECM) memory for various engine conditions (coolant temperature, A/C operation and so on). The ECM keeps the actual idle speed at the target idle speed by switching the Idle Air Control Valve IACV) ON/OFF to control the intake airflow. If the IACV output duty cycle (the length of ON time) is out of a specified range, a malfunction is detected and a DTC is stored.

P1509 Information for specific makes
P1509 ACURA Idle Air Control Valve System High RPM
P1509 AUDI Idle Air Control Circuit Electrical Malfunction
P1509 BMW Idle Speed Control Valve Opening Solenoid Control Circuit Electrial
P1509 BUICK Idle Speed High Idle Air Control System Not Responding
P1509 CADILLAC Idle Speed High Idle Air Control System Not Responding
P1509 CHEVROLET Idle Speed High Idle Air Control System Not Responding
P1509 DODGE Leak Detection Pump Switch or Mechanical Fault
P1509 GMC Idle Speed High Idle Air Control System Not Responding
P1509 HONDA Idle Air Control Valve System High RPM
P1509 HYUNDAI MPS - High
P1509 ISUZU IAC System RPM High
P1509 JAGUAR Idle Air Control Valve Circuit Malfunction
P1509 MAZDA Idle Air Control Valve 2 Short / Open Circuit
P1509 MINI Idle Speed Control Valve Opening Solenoid Control Circuit Electrial
P1509 VOLKSWAGEN Idle Air Control Circuit Electrical Malfunction
Related Information
Repair Importance Level: 3
 
1=Low 2=Medium 3=High What does this mean?
Repair Difficulty Level: 2
 
1=Easy 2=Moderate 3=Hard What does this mean?
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