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Re: p0505 code with my 2000 mitsubishi eclipse
You will need to replace the IAC (idle speed control airbypass valve) it is near the ythrottle valve in the intake, it has either a black or gray connector going to it, don't confuse it with the throttle position sensor.
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Error Code:P0505 Fault Location:
Idle Speed Control (ISC) System - Malfunction Possible Cause:
-Idle speed control (ISC) actuator/Idle air control valve (IAC) valve.
-Throttle valve tight/sticking.
-Engine control module (ECM).
Ok...!!! P0505.. Idle Air Control sistem.. first check the harnes is well conected have somebody to helpyou run the engine this device is located in the air housing in the middle move this side to side if you see the engine ligth blinking thats a conector problem otherwise replace this IAC. disconect the ground from the battery so the new item be reconice from the computer
p0505 is directly related to the idle air control valve (sometimes called the rotary valve) i cant count how many of these i have replaced on hondas. It is located directly under the throttle body so it can be difficult to replace. I would recommend you having a professional replace this due to the difficulty of the valve removal