CEL + 20A fuse blowing

[explanger]

97 EB SOHC AUTO. All Stock 90K. Took a nice long drive in the Sierras for 3 days and when I got back filled up with Gas and CEL came on. Brought it to the garage they were getting codes for all the O2 sensors.

Then they found a 20A fuse at the front of the Power Distribution Box under the hood blown. They replaced the fuse and it ran for about a day then the CEL came back and yes the fuse blew again.

I don't know what this fuse is for, it is toward the front of the PDB next to one of the big relays. Second row from the front.

My garage said go to Ford and have them isolate it.

Any ideas will help. By the way, everything seems to be working and running normally 4 now, just worried that it is something more serious.

 

[Robb]

Which fuse?

 

[explanger]

"AA" it is one of the small fuses.

 

[Robb]

"AA" is a PCM diode. It is a little black thing with a "-->I" kinda symbol on top. It isn't a 20a fuse.

In my '96, there is a small 20a fuse between DD and EE that isn't shown in that pic. Could that be what you are referring to? (that pic is for a '95 which isn't OBD2 or SOHC, that is why is probably isn't shown)

 

[explanger]

Actually the fuse is the one next to DD, on my 97 there is no module EE just a relay in the DD position and the little 20A next to it. There is at lease one more open slot for another small fuse next to the actual fuse that is blowing. Sorry, I'm trying to go from memory, still at work on a conf call.

 

[explanger]

just in case anyone happens here, the problem ended up being a chaffed wire on "circuit 34".

The codes presented were P0141, P0155, P0156, P0161. Wire replaced

problem fixed

 

[Harry5150]

Where abouts was the wire chaffed?

Originally posted by explanger
just in case anyone happens here, the problem ended up being a chaffed wire on "circuit 34".

The codes presented were P0141, P0155, P0156, P0161. Wire replaced

problem fixed

 

[explanger]

trying to find out, will update this thread once I find out. The wife picked it up so I didn't find out.