Conquering P0505 A Comprehensive Guide to Throttle Position Sensor Repair

The check engine light is getting triggered when the PCM is in a closed loop operation. It also means that it is starting to monitor the OS2 sensor input. This code which states IAC fault, there is no idle air control valve, no idle speed controller, or EGR system. Celica Forums General Discussion General Code: P0505 ; IDLE AIR CONTROL SYSTEM FAULT. The P0505 trouble code indicates an "Idle Control System Malfunction." This diagnostic trouble code (DTC) is triggered when the engine ... I keep getting the p0505 code. Everything seems fine, runs smoothly, idles fine. I have been searching for intake vac leaks, but no luck. Any ideas anyone? The ODBII code P0505 indicates a malfunction in the idle control system, which regulates the engine's idle speed. That doesn't mean that the P0505 error code is caused only by the failure of the idle air controller. Want to erase your check engine light and fix your P0505 ... 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 ... P0505. IDLE CONTROL SYSTEM MALFUNCTION. CIRCUIT DESCRIPTION. The rotary solenoid type ISC valve is located under the throttle body and intake air bypassing the ... The P0505 code can be caused by a faulty idle air control valve, vacuum leak, damaged wires or connectors, an idle speed that isn't calibrated, ...