2G Throws codes P0325, P1500, P0505

[97gst1126]

Ok so I just got home and after sitting at a firends house with the car running for 5 minutes tops my check engine light came on. Long story short I checked the codes and came up with these 3.

P0325 - knock sensor 1 circuit (bank 1)
P1500 - Generator FR terminal circuit malfunction
P0505 - Idle Air Control system

Other things wrong..
I have went through 5 yes FIVE alternators in the past 3-4 months at first I thought it was just standard remanufactored piece's of junk. But after the 3rd i knew something wasn't right. I have searched for all sorts of things, but no luck yet in a solution.

My idle will hit 2k and come back to 1k every time I stop at a light/stop sign I thought it may be a boost leak of some sort so i went throughout the car, but haven't found a thing.

As for the codes I'm at a total loss. I have searched the internet and I know what the knock is, but have no idea why it would be that because it runs fine and this engine is a brand new fresh rebuilt 6 bolt. I have read to see if it has "melted" ? I haven't had time to look at that yet.

So anything is helpful i have no idea what the other 2 codes mean exactly even after searching the forum.

 

[Here4u2hate]

First of all check your IAC plug... Second It is possible to be a boost/vacuum leak, if thats the case get some wd-40 and start spraying it around vacuum hoses and it should spike if you find a leak. as far as the sensors I would personally go out and buy M.I.L. eliminaters for any sensor that goes out unless it runs a guage thats just me, I guess

 

[dsm racer91]

what about the speed idle motor ?

 

[ktgurl87]

wouldn't the IAC be the same thing as the "idle speed motor" ?

 

[luv2rallye]

P1500: http://www.dsmtuners.com/forums/newbie-forum/265093-getting-cel-code-p1500.html