2009 Aveo5 - PCV Valve Location

[cmm47172]

Does anyone know where the PCV valve is located on my 2009 Chevrolet Aveo5 1.6L LT?
I could also use some install instructions if available.
Also looking for a vacuum hose/line diagram.

The check engine light is on throwing a P0171 code (system too lean - bank 1).
None of the local parts stores have a PCV valve as they all say it's a dealer item.
I tried the dealer however all are closed today for New Year's Day.
I talked to a guy at an Advance Auto store who looked on some GM site they have access to and said that according to GM, the code is due to a leaking diaphragm inside the PCV valve.

Anyway, the car runs great, no abnormal noises, surging or fuel consumption.
The air filter, spark plugs and gas cap are new.
Any help at all would be greatly appreciated!

[petrified.rabbit]

I'm not sure its much of a valve as it is a hose.. AFAIK it is on the backside of the valve cover and goes into the intake.

[cmm47172]

That's interesting. I wasn't able to find an online picture of one. I wonder how hard it is to swap out? I wish I could find a manual on this car.

[cmm47172]

Here's a link and a picture from Chevy Parts.

http://www.chevroletonlineparts.com/...name=pcv-valve

I wonder if the Advance Auto Parts guy was right about the P0171 code.
Any opinions???

[EAD15]

The PCV hose is item 4 on this image. Attached to the throttle body. As for a manual, you can buy 4 years of access to the factory service manual for only $40

[EAD15]

And here is the DTC information for the P0171 code from the service manual.

DTC P0171 Fuel Trim System Lean
DTC P0172 Fuel Trim System Rich
Circuit Description

The engine control module (ECM) controls a Closed Loop air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. The ECM monitors the heated oxygen sensor (HO2S) signal voltage and adjusts the fuel delivery based on the signal voltage while in Closed Loop. A change made to the fuel delivery changes the long and short term fuel trim values. The short term fuel trim values change rapidly in response to the HO2S signal voltages. These changes fine tune the engine fueling. The long term fuel trim values change in response to trends in the short term fuel trim. The long term fuel trim makes coarse adjustments to fueling in order to re-center and restore control to short term fuel trim. The ideal fuel trim values are around 0 percent. A positive fuel trim value indicates that the ECM is adding fuel in order to compensate for a lean condition. A negative fuel trim value indicates that the ECM is reducing the amount of fuel in order to compensate for a rich condition. The fuel trim cells are based on the engine speed and load.
Conditions for Running the DTC

• DTCs P0101, P0102,P0103, P0106, P0107, P0108, P0112, P0113, P0201, P0202, P0203, P0204, P0217, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0300, P0301, P0302, P0303, P0304, P0442, P0443, P0496, P0449, P0451, P0452, P0453, P0454, P0455, P0461, P0462, P0463, P0464, P0506, and P0507 are not set.
• The fuel system is in Closed Loop.
• The engine speed is between 400-6,100 RPM
• The engine coolant temperature (ECT) is between -38 to +130°C (-36 to 266°F).
• The intake air temperature (IAT) sensor is between -20°C to +150°C (-4°F to +302°F).
• The manifold absolute pressure (MAP) is between 15-255 kPa (2-37 psi).
• The barometric pressure (BARO) is greater than 70 kPa (10 psi).
• The engine airflow is between 1-512 g/s.
• The vehicle speed is less than 140 km/h (87 mph).
• The fuel level is greater than 10 percent.
• The DTCs run continuously when the above conditions are met.

[petrified.rabbit]

unless the PCV is stuck open, i don't know that it will cause that lean code. It is not flow monitored. it is more or less a hose with a check ball. Not an monitored electronic open close circuit like some of the other vehicles. it is past the throttle plate so it would only add extra air when at idle which is when the system is open anyhow. If it was clogged and the ECU was expecting the air, it would run rich..


but I would think with the aveo in particular it would point to o2 sensor, or MAF since your an 09..

[cmm47172]

Thanks everyone. The one I saw on the Chevy site does not look like the one pictured by EAD15?????????
PCV VALVE for 2009 Chevrolet Aveo5|96495288

[EAD15]

My picture just shows the hose. The valve would be in one end of it, I would imagine. The service manual doesn't mention it specifically

[cmm47172]

I'm still having the same P0171 code. The check engine light will come on for a few days and then go back out. Does anyone know where the o2 sensor and the MAP are located? What is a MAP sensor anyway? Does this car have both an upstream and a down stream oxygen sensor or just one? Which one would be most likely to trigger the P0171 code?