Unlocking the Mysteries of P0505 Throttle Position Sensor Diagnostics and Solutions

Take the Idle Air Control valve off the bottom of the Throttle Body and clean it. If that doesnt work you may need a new one. In this thread, the poster mentioned that he discovered the electrical connectors to the IACV and the power steering pressure sensor were ... P0505 = Adaptive Air Idle Trim (Upper/Lower) Volvo DTC Code EFI-233 Possible source(s) Upper limit:[*]Clogged air cleaner or air intake.[*]Contact resistance ... The P0505 trouble code indicates an "Idle Control System Malfunction." This diagnostic trouble code (DTC) is triggered when the engine ... That code can mean anything that interferes with a smooth idle, including bad gas, oil in the charge pipe, a dirty Maf sensor, even a broken ... This code is triggered if the IAC pintle is 100% open and the idle RPM is more than 200 RPM lower than the ECM idle RPM setpoint value. Problem solved! It seems the "Wise One" here installed the EGR valve with no gasket. This allowed the hold down nuts to loosen (or they were ... Customer: I have a code p0505 and I changed the idle control valve twice. Mechanic's Assistant: Have you seen this error before with the same vehicle? The ECM operates only the IAC valve to perform idle–up and provide feedback for the target idling speed. DTC No. DTC Detecting Condition. Trouble Area. P0505. OBD Code P0505 - Idle Air Control System Malfunction ... P0505 is an OBD-II generic code in which the engine control module (ECM) finds out the engine idle ...