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If the light comes on and stays on, and the scanner will not communicate, this normally indicates that it has died. I would say to double check the fuses, and BEFORE you replace the pcm. I would say to try replacing the pcm and IDM relays. It is possible, the relays are not making good connection and causing problems. Here is a diagram for the fuse box under the hood. Thanks
I just found something new. I was going to order the pcm and the sales rep told me that he needed the part number. I removed both the IDM and PCM from the truck. The IDM has water/mositure in it and there is a black mark on the back side (shorted circuit?). My question now is should I replace both modules?
I received the IDM and replaced it. The truck started, runs good, however now experiencing hard starts in the morning. The glow plug circuit appears to be working. Should I hook up scanner again and retreive codes?
P.S. I also ordered a PCM but didn't use it. The place where I got it won't give me money credit back, they want to issue store credit. So I still have the remanufactured/programed PCM if you think I should replace it.
Hooked up scanner today. Just one code P0603-I think this is from disconnecting the batteries. How long does it take to clear the code? It's been about 3 days now with power. Also plugged in truck last night--started right up this morning. I will now concentrate on the glow plug relay/solenoid circuit. I know the solenoid got hot from trying to start the truck when the IDM problem occured. Truck runs good otherwise.
P.S. My friend who owns the repair shop had an F350 powerstroke come in yesterday that stopped running---it was down 9 quarts of oil! Filled back up and it started right away!