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I recently borrowed an engine code scanner after my check engine light went on and got a P0505 code on my 2004 Prius with 185,000 miles and started to fix things. I replaced the PCV and spark plugs as well as the air filter. It ran fine , but decided to also clean the MAF using CRC MAF cleaner and also clean the throttle body and butterfly using CRC Throttle Body cleaner. I seem to have put it all back together, but now the ICE won't shut down, even when warm, and actually wants to rev beyond what seems to be needed.

I'm at a loss as to where to look next or to figure out what went wrong. Does anyone have any suggestions?
 

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I got another scanner and got some stuff that I honestly don't understand. It said 2 codes then gave me P0505 followed by:
Mil On
Monitor 0 inc
6 ready
misfire
fuel
comp
catalyst
evap
O2 sensor

This is starting to get scary.
 

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DTC P0505: IDLE AIR CONTROL SYSTEM
The idle speed is controlled by the Electronic Throttle Control System (ETCS).
The ETCS is composed of the throttle motor which operates the throttle valve, and the throttle position sensor which detects the opening angle of the throttle valve.
The ECM controls the throttle motor to provide the proper throttle valve opening angle to obtain the target idle speed.
The ECM regulates the idle speed by opening and closing the throttle valve using the ETCS. If the actual idle RPM varies more than a specified amount or a learned value of the idle speed control remains at the maximum or minimum five times or more during a trip, the ECM concludes that there is a problem in the idle speed control ECM function. The ECM will turn on the MIL and a DTC is set.
Example:
If the actual idle RPM varies from the target idle RPM by more than 200 (*1) RPM five times during a drive cycle, the ECM will turn on the MIL and a DTC is set.
HINT:
*1: RPM threshold varies depending on engine loads.
 

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Hi DickD,

I have the exact same symptom. Is your issue resolved? If it was, what was(were) the solution(s)?
Thanks.
 

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Idle Air Control

I've been having the same "ICE" not stopping issue also. Mine has been intermittent. I've noticed some residual oil gunk where the PCV hose attaches to the base of the throttle body. Today I found the tube that is pressed into the throttle body loose. With little effort the metal fitting pulled out. This is supposed to be press fitted creating a sealed connection for the PCV hose to connect to. There was also a very small crack in the PCV hose under the spring clamp. This will cause an air leak in the system. I think this may be my problem. The car is going in the shop tomorrow to have it looked at.
 
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