I have a 97 F250 CC Short Box with E4OD. For the last few hunderd miles I would get an intermittent momentary shutoff while going down rough roads. Suspected Cam Sensor, chaged it, - not the issue. Intermittent shutdowns continued. Yesterday following a start up, I backed the truck out of the driveway, got on the service street, and went about 25 yards before everything went dead.

Upon attempt to restat there was no problem at all cranking. There was no tacho bounce, so I suspected Cam Position Sensor again. Changed it... no change to truck behavrior. Then I noticed that I had no WTS light. Checked the #22 fuse. It's fine.

Now I suspect that the issue is the PCM relay, I'm guessing it was borderline when I had the intermittent issues and now it's done.

Question is: which one of the relays powers the PCM?

Also any other ideas about possible failure causes are welcome.

thanks,

Rory

 

Bump...

I'm having similar problems. I believe that #22 feeds the diode next to it and on to the PCM. There is no "relay". I too have no WTS light, #22 is fine, and the diode is fine. I bought the truck with Edge Evolution already being used. Now as I hook the Edge up to get codes it does not communicate with the PCM. After researching these great forums I believe my PCM is huffed. Currently I'm looking into getting another PCM from DP-Tuner as I've read a lot of great things about them.

What I am still not clear on is what difference the DPC # makes. I have a DPC-312. Other info is F7TF-12A650-RC MME2
Right now DP has a DPC-202 and some DPC-4xx

And also, from what I've read from these great minds I'm not going back to the Edge. I'll probably get more goodies from DP-Tuner.

 

Turns out my #22 was blown, probably by the fuel heater. I had missed it at first, and then found what I thought was #13 blown, only to realize I read the fuse box layout diagram upside down. I cut the fuel heater line as I didn't see a spade connector and was leery about cracking something at the connector. The WTS light is back (never thought I'd be so happy to see it). Haven't yet tried to start it - waiting on the block heater a bit longer.

Rory

 

tape up the wire you cut so it doesnt ground out and blow again