Major Electrical gremlin
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Elder User
Joined: Aug 2015
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ok, I thought It was the one under that. I will swap and try. I just tried key on, pcm in, idm unhooked, probed idm plug and it has nothing anywere. Obvious which are the power wires because they are huge. Also I have the idm plug diagram but its different than mine. the wires are in different holes so that's why the idm plug test for the whole harness and solenoids didn't work. do you have a idm plug diagram? also a diagram of the wires leaving the fuse box so I can probe for idm power off the back side to see if maybe my fusebox is toast.
Hotshot
Joined: Jan 2011
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From: Puget Sound
You mentioned a loose shifter. What about those two bolts under the steering column? Does anybody remember where the picture of that is? This really makes me wonder about that chafed ignition wire in the steering column. How about that picture?
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Elder User
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My fuel gauge works as well, as does oil pressure while cranking. My idm schimatic is totally wrong, mine is way different than the drawing and the wires are all in different places. Looking for a drawing now. That being said I changed the relay, both of them, no different. I tried to probe the back of the fuse panel to see if the idm power is getting out, but can't figure out which plug has those wires, they don't line up with the relays. I found one big dark green light green trace wire that looks the same as my power wire on the idm plug, and it tested dead. So may be the right one, meaning my fuse box has a break inside some were??
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Thank you do much. I have a complete set, but I think its for an excursion although it says all models. A lot of things have slight differences. Id love to have your complete 02 pdf??? Just send it all if you like. Thanks for what you do send. currently trying to find which power wire out of back of fuse panel is the relay out to idm. My idm plug has absolutely nothing on any pin, key on , pcm in. Sure seems like a dead pcm, but I know it works in other trucks.
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Elder User
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I just tried pin 80 key on pcm in, probed back of pcm plug. Pin 80 is sending out a signal to the idm relay. So the pcm is ok. Now need to find idm power out of back of fuse box. If I can determine that fuse box is not letting the power out, I can run an external relay for now, separately to see if powering the idm jumping over the fuse box will restore function and communication. Cannot find a diagram of the wires coming out of the fuse box. gee wiz. road block after road block
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Elder User
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Well its alittle un orthodox, but it told me a clue. I took an old relay I had as a spare. Carefully dismantled it to have access to the inside. I put that relay in the IDM spot and it does not trip. It has 30 power to it, but the points don't move. The clicking I felt was the pcm relay tripping, it makes all of them seem to click. So I know now I have signal from the pcm out to the relay, but that signal does not reach the fuse box. I'm thinking of running a jumper to a rigged up relay to get the power signal from the pcm to the relay to trip the idm. I would have to tap all the wires though as I havn't a clue which plug on the back of the fuse box is that relay. In my fuse box the idm is the bottom one by the way. 303. 302 the middle one is the pcm.
Logistics Pro
Joined: Aug 2009
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From: Arizona
My diagrams are on a write protected cd and the only way I can figure to copy them is a screenshot uploaded to photobucket. Hope you can read it: scroll down to my comments
Here is what I see: The PCM sends a signal to the IDM relay from pin 80 on a white/black wire, then the relay closes and sends power to the IDM on a dark green/light green wire. Make sure the relay is getting a ground reference or it will not close.
Here is what I see: The PCM sends a signal to the IDM relay from pin 80 on a white/black wire, then the relay closes and sends power to the IDM on a dark green/light green wire. Make sure the relay is getting a ground reference or it will not close.
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Didn't check the ground on that relay. which pin on the relay is the ground? 85 or 86? Also, I see the big green light green wire out of the back of the fuse box, and its dead. Is that the plug for this relay, or is it something else. Not sure if that wire is green all the way to the fuse box, or if it changes as lots do. I know the white black(pin80) is not on the back of the fuse box, it must change colour, maybe that's were it loses power?? Just want to find that plug on the fuse box so I can eliminate the fuse box. It may be the broken link.
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Probing the fuse box, relay 303 for the idm. I have all the time power. Do not have signal, pin85 or 86. No ground, 85/ 86. The diagram you sent does not match my truck at all. Same one I have. It has the correct pin numbers and plugs, but the colours on my fuse box plugs are all different and don't match. Since theres several plugs like that, and the colours don't match. I haven't a clue which plugs to tap. It also appears that relay receives signal, power and its out puts come and go threw several plugs, not just one. So once again I am at a dead end because I have no colour code for the back of my fuse box, so cant find wires there. Makes you wonder who designs this stuff. If I was running wire, I could run it 50 miles, and threw a thousand plugs, and when it reached the other end, it would be the same colour. The guy at ford on the colour coding must have been tripping on crack.
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Elder User
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So basically I'm saying the green light green is correct at my idm plug, but does not exist on the fuse box, unless it is that one dead one I found. No way to know without removing and dismantling the whole harness. The white black is correct at the pcm plug, but does not exist on my fuse box. So again, no clue which plug it goes to on the fuse box because I don't know what colour it is. Same with power in. IT s the only one working, and I can't find it on the fuse box plugs either. So totally in the dark.