I have searched and it seems that everyone with FICM voltage questions has a rough running truck.
The odd thing here is that my truck is running fine.
About a week ago I filled up the tank and soon after my CEL came on.
I went to Autozone and had them check the codes.
P0261, 0264, 0267, 0270, 0273, 0276, 0279, 0282. All eight of them.
The next day the CEL is off.
After several tank fillings the light has come on a couple of times but not every time.
It came on again this morning. I had the codes checked again. All the same codes.
I referred to Swamps procedure for checking the voltage and I got 48v with the key on.
The voltage dropped to 30v while running.
I see that according to Swamps it is probably bad.
The thing that bothers me is that the truck seems to be running just fine.
I want to be sure there is nothing else that could be wrong.
Cranking time seems to be roughly the same. It was shorter when it was new but I would think that would be normal.
Any help would be greatly appreciated.