IACV-AAC valve

[ahardb0dy]

Just want to share what happened today on my sentra, I'm posting this because the pathfinder also has this valve.

 

I was in the process of flushing my radiator and engine and when I started the engine the idle would not drop so I checked the codes.

I got a code 25, AAC valve, per the FSM to troubleshoot it said to unplug the harness going to the AAC valve and check the ohms at the 2 pins, which I did and they were ok, than it said to turn the key to "on" and check for battery voltage at the harness connector and I had 1 volt less than battery voltage, the thing about this is when I turned the key to "on" I could hear a buzzing under the hood and I traced it to the AAC valve.

 

 

I removed the AAC valve and checked to see if the little pluger was moving when I connected and removed the plug it did not, I than connected the AAC valve to my power supply in my shed and the AAC valve worked perfectly, I thought it might be working on the power supply because it was putting out more voltage but I checked the AAC valve's operation at voltage as low as 8 volts and with the amps on my power supply turned all the way down and it still worked. I re-connected it to the harness in the car and it still did not work correctly.

 

Long story cut short it turned out the ground in the harness connector was bad, I exposed the ground wire and using a terminal tap connector ran a new ground from the wire to the firewall and it worked correctly.

 

 

As I said just wanted to share what I found in case anyone else runs into this.