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DTC No. - P0505
DTC Detecting Condition Trouble Area - Idle speed continues to vary greatly from target speed
Trouble Area - Air induction system, Electric throttle control system
Check air induction system. Repair or replace. Check electric throttle control system, Clean throttle body, Inspect Throttle Valve, Inspect Throttle Body Operation, Inspect Throttle Control Motor, Inspect Throttle Position Sensor,Inspect Accelerator Pedal Position Sensor. Replace defective parts
There is no idle air control valve, no idle speed controller, or EGR system. With VVTi valve overlap can be controlled to create an EGR effect,
eliminating the need for an EGR valve. The entire throttle is electronically controlled, and idle speed controlled through the ETCS. What I would do is clean your throttle body and butterfly using carb/TB cleaner. on top of the TB is a 1"x3"(roughly)
rectangular plate held on by two philips screws. You take the cover off and there are a bunch of tiny holes in which your idle air passes through when the butterfly is closed. When I cleaned those holes out I noticed better idle. Definitely worth cleaning and may help with your code. Takes all of about 5 minutes to clean. I can tell you that I've responded to members threads that directly related to DTC P0505, and the simple cleaning as mentioned above took care of the problem with no more code. I would try this first, clear the code, and see if it returns.
Here is a diagram of how it's layed out:
possible causes of P0442:
-fuel tank cap incorrectly installed
-fuel tank cap cracked or damaged
-vacuum hose cracked, blocked, damaged, disconnected(hose 1,2,4,5,6,7,8,10,11-see image above for hose #)
-fuel tank cracked, holed, or damaged
-chacoal canister cracked, holed, or damaged
-open or short in vapor pressure sensor circuit
-vapor pressure sensor
-fuel tank overfill valve cracked or damaged
I see you said you just put your intake back to stock. I would verify the canister closed VSV is connected, which is located right by the stock air box(to the right as you look at the box). The bottom of the valve is supposed to be connected to the bottom of the air box with a short piece of tubing, and the connection(tubing) on the side of the valve goes back to the charcoal canister. I would verify that and check the gas cap to rule out the easiest. hope this helps.
I own 2001 is300 and the cel is on as well as the trac off is flashing. I was able to get codes from a failed smog. P0440, p1120, p1121. I have looked them up but don't know how to start fixing them. My car will drive fine for awhile but then it seems like I have to floor the pedal for the car to go any faster. Help on this would be great.
01 auto with 177xxx scanner reads p1346, p0300, p0301, p0302, p0303, p1346. Yes the scanner shows 6 codes with p1346 twice. I have cleaned the MAF and drained/reset computer. Car hesitates when applying gas. Going to SeaFoam gas and hose and replace PCV valve. Any ideas? Thanks in advance.
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