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P0505 - Idle Control System Malfunction

Possible causes
- Faulty IACV-AAC valve
- IACV-AAC valve harness is open or shorted
- IACV-AAC valve circuit poor electrical connection
When is the code detected?
The P0505 code is set when the IACV-AAC valve does not operate properly.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine hard to start
- Rough or erratic idle speed
P0505 Description

This system automatically controls engine idle speed to a specified level. Idle speed is controlled through fine adjustment of the amount of air which by-passes the throttle valve via Idle Air Control Valve IACV) and Auxiliary Air Control AAC) Valve. The IACV-AAC valve changes the opening of the air by-pass passage to control the amount of auxiliary air. This valve is actuated by a step motor built into the valve, which moves the valve in the axial direction in steps corresponding to the Engine Control Module (ECM) output signals.

One step of IACV-AAC valve movement causes the respective opening of the air by-pass passage. (i.e. when the step advances, the opening is enlarged.) The opening of the valve is varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects the actual engine speed and sends a signal to the ECM. The ECM then controls the step position of the IACV-AAC valve so that engine speed coincides with the target value memorized in ECM. The target engine speed is the lowest speed at which the engine can operate steadily. The optimum value stored in the ECM is determined by takig into consideration various engine conditions, such as during warm up, deceleration, and engine load (air conditioner, power steering and cooling fan operation).

P0505 Information for specific makes
P0505 ACURA Idle Air Control Valve
P0505 CHRYSLER Idle Control System Malfunction
P0505 DODGE Idle Control System Malfunction  P0505 Image
P0505 FORD Idle Control System Malfunction
P0505 HONDA Idle Air Control Valve
P0505 INFINITI Idle Air Control Valve  P0505 Video
P0505 JEEP Idle Control System Malfunction
P0505 KIA Idle Air Control System
P0505 LEXUS Idle Air Control System
P0505 LINCOLN Idle Control System Malfunction
P0505 MAZDA Idle Control System Malfunction
P0505 MERCEDES-BENZ Idle Control System Malfunction
P0505 MERCURY Idle Control System Malfunction
P0505 NISSAN Idle Air Control Valve  P0505 Video
P0505 SCION Idle Control System Malfunction
P0505 TOYOTA Idle Air Control System
P0505 VOLVO Air Assisted Control Valve
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