P0505 The Ultimate Troubleshooting Guide for Throttle Position Sensor Problems

2004 Toyota Matrix XR with only 111000 miles. I own a 2001 Cherokee Sport. Recently I've been having an issue with my RPM at idle. It surges anywhere from as low as 300 RPM to as high as 1400 RPM. Code P0505 points to a straightforward issue – an idle control system malfunction. This impacts engine RPMs at idle, causing a rough run. P0505 is thrown when your idle air PWM cannot reach the desired RPM the ECU wants. I get this when controlling my idle with an aftermarket ECU ... The P0505 code is a diagnostic trouble code related to the idle control system of a vehicle. Specifically, it indicates a malfunction in the Idle Air Control ( ... Rodent nest in the air intake . You get the PO505 when a different idle pattern is detected it can be any place in the whole circuit . 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. 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 ... P0505/Code 14 is Idle Control SYSTEM malfunction, not IACv. Possible Causes: -IACvalve mechanical malfunction -Throttle body clogged port, improper ... Depress the accelerator pedal slightly. Start the engine and run for 5 seconds. Turn the ignition switch to the OFF position for 10 seconds.