![]() ![]() The idle air control valve’s primary job is to regulate the idle speed of your engine. While replacing the idle air control valve seems like a good idea, it’s worth your time to check for a vacuum leak first. Typically, P0505 is going to be caused by either a vacuum leak, or a problem with the idle air control valve. Here are some of the most common symptoms of P0505: This particular trouble code lets you know that there is something wrong with the idle air control system, but that’s about it. When P0505 is triggered, it is typically caused by a stuck idle air control valve, a clogged idle air control valve, or a vacuum leak. P0505: Idle Air Control System: Malfunction It’s a generic code, which means that it has the same meaning for the Vectra as it would any other vehicle (Vectra or not). The optimum value stored in the ECM is determined by taking into consideration various engine conditions, such as during warm-up, deceleration, and engine load (air conditioner, power steering, and cooling fan operation).P0505 is an OBDII code that deals with the idle air control system in the Opel Vectra. The target engine speed is the lowest speed at which the engine can operate steadily. 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 crankshaft position sensor (POS) detects the actual engine speed and sends a signal to the ECM. 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. One step of IACV-AAC valve movement causes the respective opening of the air bypass passage. ![]() 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. The IACV-AAC valve changes the opening of the air bypass passage to control the amount of auxiliary air. Idle speed is controlled through fine adjustment of the amount of air that bypasses the throttle valve via Idle Air Control Valve IACV) and Auxiliary Air Control AAC) Valve. ![]() This system automatically controls engine idle speed to a specified level. ![]()
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