Throttle Position Sensor (TPS) Code P0505 Symptoms, Causes, and Fixes

How to fix a P0505 engine code: Idle Control System. A P0505 code is set when the computer detects the engine RPMs at Idle are erratic. Idle Air Problem, not IAC valve! (code p0505) · About once every 30 drives, the idle surges. · Every drive, when the engine is up to temp, ... This code comes on for two conditions. When the idle speed isn't the specified amount or a learned value of the idle speed control remains the maximum or ... P0505 can be caused by not only a bad IACV but also a vacuum leak, misadjusted idle speed, bad ECT sensor/circuit, or bad TPS sensor/circuit. Code P0505 points to a straightforward issue – an idle control system malfunction. This impacts engine RPMs at idle, causing a rough run. The P0505 code, along with the P0506 and P0507 codes, have to do with your vehicle's idle air control valve (IAC), a piece commonly found on or near the ... Celica Forums General Discussion General Code: P0505 ; IDLE AIR CONTROL SYSTEM FAULT. It starts right up and idles ~800, perfectly smooth and even. the longer it runs the higher the idle gets, up to around 1100 (900 with AC on) when fully warm. In this thread, the poster mentioned that he discovered the electrical connectors to the IACV and the power steering pressure sensor were ... Detailed information on troubleshooting and repairing a P0505 DTC code which refers to a malfunction of the IAC (Idle Air Control) system. Also ...