My XC70 sputtered at 50 MPH today, and lit the CEL. Had it read at Autozone, and they got code P0243 (wastegate solenoid A). Car has 110k miles, all vacuum hoses replaced, and a recent tune-up. Seems to run fine now. What should I look at?

Thanks!

So its your turbo control valves signal missing, likely intermittently. There are a few causes, and if you've got a few minutes and a multimeter we can test it and see what the problem is. Most likely the connection is loose/corroded, but working through everything takes all of 5 minutes so might as well rule everything out..

So first thing is to connect a voltmeter between pin 1 (pins facing you, the one on right..) and the ground with the ignition on (engine off..) should have battery voltage. If not you've got a short between that wire and the main relay (located on the radiator fan shroud). Assuming its correct, check pin 2 to see the voltage in it, should read 6V. If its not ~6V you've got a short between that wire and the computer. So if its correct, turn the key off and check resistance between the pin one and two. It should be about 24Ohms when the engine is cold. If that's good too then its the connection, so make sure its seated properly. If not, then try a new turbo control valve.

The valve is down past the intake hose.



--
If you're not driving it "like its stolen," are you really driving?

Unfortunately, my multimeter is in FL, and the car is in IN. I searched the forum for the code, and found several references to the MAF causing this code.
Weird.

Can you give me a little more detail where the turbo valve is located? I saw a purple vacuum hose running from the turbo area to a control unit attached to the top-inside of the radiator shroud. So, I thought this might be the valve.

Thanks!!

When you 'google', always do it with "volvo" before the Pnnnn. That way you get answers like this:

http://www.volvoforums.org.uk/showthread.php?t=8488

IPD has a very good one for sale for around $40, it works real good. Let them know it is for a light pressure 5 cyl.

Klaus
--
Always willing to listen, just not able to take direction.

Its got three hoses attached to it, should look like this. Here's the parts diagram showing stuff, 16 is the TCV. Thats really all I can say about it, since I don't have a v70 myself. Hopefully its enough to get you started...

Autozone should let you use theirs in the parking lot without much problem (probably hold your ID while you use it..) You probably won't need it for more than a couple minutes once you figure out where its located.. If you don't want to head up there tonight, try plugging and unplugging it a few times to clean the connection a bit then make sure its in snug and hope for the best!
--
If you're not driving it "like its stolen," are you really driving?

Took it to the shop, and they replace the MAF. Seems fine now.