What Does P0505 Mean? 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). engine code P0505P0505 fixobd P0505dtc P0505obd code P0505obd2 P0505P0505 car codediagnostic code P0505car code P0505check engine code P0505fehlercode P0505P0505 fiatcodigo P0505codigo falla P0505P0505 kody b??dówcodigo de falla P0505 What are the common causes of P0505 ? A carbon coked throttle body bore is by far the most common cause of this code. Other causes include shorted or open electrical circuits, a faulty idle air control valve, a large vacuum leak, or a bad PCM. PCM failure is rare. How do you troubleshoot P0505 ? Replacing the IAC valve and cleaning the throttle body and passages Removing carbon from throttle body and IAC passages and clean IAC Repairing a vacuum leak in the engine intake manifold vacuum system or gaskets Searches related to P0505 - Idle Control System Malfunction p0505 toyota corolla p0505 jeep idle air control system p0505 p0505 nissan p0505 mitsubishi p0505 toyota camry idle air control system rpm higher than expected p0505 honda accord
