PCM issues

nwpastroker · Nov 29, 2014

2002 f350, had the chip come out of the PCM while truck was running, now no start. Chip or no chip, wts and check engine lights stay illuminated. No power to chip controller( display will not illuminate, Hydra), no power to the right side of the fuse box under the hood, from fuse 42 over and up to fuse 24. Just wondering if there is some things I can check out before replacing the PCM. Also, if a replacement is what needs to be done, what is required to switch from the PCM (AEB4) to a DAC3 from a late 99.
Thanks guys

co04cobra · Nov 29, 2014

PCM is fried. You've pretty well covered the basics of checking it. WTS staying illuminated is pretty classic sign. And you can't switch from a 02-03 (aeb4) PCM to 99-01. That is becoming a very hard PCM to find. Good luck. Might check with swamps or DP and see if they can fix them.

nwpastroker · Nov 29, 2014

Which is becoming hard to find? The AEB4? Or the DAC3? I thought the DAC3 was sought after due to being able to tune the easiest.
Thanks for the impur!

co04cobra · Nov 29, 2014

The AEB4 is becoming hard to find because it's 02-03 manual pcm only. DAC3 works great for 99-01 trucks but will not interchange with your truck.

If you have a chip you could run a, vdh or any dpc-462, 02-03 auto pcm, and have your tuner burn the tunes for the AEB4.

nwpastroker · Nov 30, 2014

Thanks!

TMan67 · Nov 30, 2014

Let me know what pcm you're looking for what year automatic or manual have several alone and if I don't have it on my way there's a bunch of them...if it fell out while truck was running 99% time pcm fried 1% chip fried but most of the time PCM you also can have that PCM reflash there's a few places that will reflash them cheaper than buying a new one

OBS-Addiction97 · Nov 30, 2014

TMan67 said:
Let me know what pcm you're looking for what year automatic or manual have several alone and if I don't have it on my way there's a bunch of them...if it fell out while truck was running 99% time pcm fried 1% chip fried but most of the time PCM you also can have that PCM reflash there's a few places that will reflash them cheaper than buying a new one

Nice first post....

lincolnlocker · Dec 1, 2014

TMan67 said:
Let me know what pcm you're looking for what year automatic or manual have several alone and if I don't have it on my way there's a bunch of them...if it fell out while truck was running 99% time pcm fried 1% chip fried but most of the time PCM you also can have that PCM reflash there's a few places that will reflash them cheaper than buying a new one

who da *** are you?

live life full throttle

superpsd · Dec 1, 2014

I would still save the PCM for parts or crack into it and see if it is repairable.

nwpastroker · Jan 2, 2015

Still having an issue here. Found a blown pcm fuse, fixed that. Glow plug light coming on, everything seems normal, but no tach movement. I'm going to try changing the cps, but I'm guessing it's something more in depth electrical. Anyone have any wiring diagrams for an 02? Or know what relays run the pcm, idm, etc? Also do any of the mega fuses, or the big fuses on the left side of the under dash panel control pcm, or idm?
Thanks guys, I appreciate the help

nwpastroker · Jan 2, 2015

Changed cps still no go. Anything else that would cause no tach movement? Checked all the fuses I could with a test light, no meter available. Swapped relays around, nothing

pilot4life · Jan 17, 2015

Did you already replace the PCM?

farmall99 · Jan 17, 2015

I don't think the tach moves when cranking on any 02 (or 03 for that matter). Has something to do with the instrument cluster ford changed to.

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Jomax · Jan 17, 2015

Try unplugging the EBP sensor, and try. If it doesn't work, plug it back in and unplug the ICP sensor and try.

If the above doesn't work, have you scanned for codes? I know on 99-01s the pcm relay and idm relay were in the engine compartment. But being you have the WTS light, I doubt the relay is bad.. the WTS light is a main indicator you have power going to the pcm.

BEST bet is scan it.

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Jomax · Jan 17, 2015

PM me your email. I have a colored wiring schematic of the pcm wiring as well as the service manual for all electrical for the 2002 on pdf.

I have no idea how to link a pdf and post it here...

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mandkole · Jan 17, 2015

Jomax said:
I have no idea how to link a pdf and post it here...

Save the pdf and use the attachment manager below or attach as a picture

nwpastroker · Jan 20, 2015

Thanks for the help guys, hoping to get home this weekend and try to do a little more diagnostics on it. It white smokes like crazy when rolling over, so I'm assuming it's getting fuel. Still going to try to pressurize the heads and see if it's holding oil as I changed injectors not too long ago. I'll try to post up this weekend if I find anything.
Thanks again

five0merc · Jan 20, 2015

farmall99 said:
I don't think the tach moves when cranking on any 02 (or 03 for that matter). Has something to do with the instrument cluster ford changed to.

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My tach moves while cranking on my truck, but not saying mine is just an odd one.