IDM or UVC Harness issues

[jgarden]

Originally Posted by klhansen

The IDM is located behind the F250 emblem on the driver's side fender. Pull the rear of the wheel well liner loose and you'll be looking up at the IDM connector.

Where is it located on the F350? (sorry couldnt resist)

[klhansen]

Originally Posted by jgarden

Where is it located on the F350? (sorry couldnt resist)

I usually type it as FX50, but didn't pay attention to what he had and just picked one.

[tgoon]

Well it turns out it was not the IDM (so now I have one it listed it the for sale section here if anybody needs one)

I borrowed the scanner and got a P1274, so lucky for me I only had to replace one UVCH (for now) and it was on the easier side (drives). UVCH from Int was $30 +tax, that was as low as they would go but they did take $6 off of it so I was happy.

Replaced it and put everything back together and the truck runs better now than it has for the last month.

[shaggy_tech]

Ford part #2C3Z-14A163-AB is a kit that comes with three (in case you lose one...does both sides with one left over) little wedges that go down into the UVC harness so it won't disconnect on it's own anymore. Sells off our front counter for about $15.

[rdnck83]

I have checked my UVCH with both a multimeter and w/ visual and neither have come loose. If it is the IDM, I hope the stealership will let me know. I unfortunately took it in today. We will see. I just want them to diagnose the prob.

[shaggy_tech]

I've had several trucks with p1667 that ended up being the pcm.

Usually this is an intermittant code...meaning unless the condition exists while it is being tested it is not really possible to come up with a definitive diagnosis.

[Redneck_Steve]

I've got a problem that after reading through this thread seems like it may be the UVC harness. The truck is an '02 F-550 with 7.3. I've lost all the cylinders on the driver's side of the engine, it happened on the road. I experience an extreme loss of power, I was barely able to get the truck home.

A mechanic friend suggested I start the truck and pull the harnesses one at a time to the valve covers. In doing this, the engine shuts down when I pull the passenger side, there is no change at all when I pull the driver's side. I've read here that the harness can come loose, is this on the underside of the cover? The harness has little clips at the plug to hold the plug together on the outside, is this the updated harness that has been mentioned?

[Redneck_Steve]

I got the valve cover off and discovered the inside plug had backed out of the gasket plug about 1/16". Is this enough to cause my problem?

Can the truck be started and idled with the valve covers off without making a mess? I'd like to verify that I've solved the problem before putting it back together.

[F350_6]

Originally Posted by Redneck_Steve

I got the valve cover off and discovered the inside plug had backed out of the gasket plug about 1/16". Is this enough to cause my problem?

Can the truck be started and idled with the valve covers off without making a mess? I'd like to verify that I've solved the problem before putting it back together.

It's an electrical connection so if you have enough separation it will kill that side. The truck can be started without the valve cover. The mess won't be too bad. Throw something over the inner fender and lay something down beneath the truck. If that's your problem you'll want to make some sort of shim to wedge in the connector so it doesn't come loose again.

[Redneck_Steve]

I dropped the valve cover in place and ran the truck a little, the loose connector doesn't seem to be the problem. Driver's side bank is still dead. A visual inspection doesn't show any problems, and I don't see any corrosion in any of the plugs. Is there anything else I should be looking for?

[F350_6]

Well you could look for oil discharge at each of the injectors to visually see if they're firing, but if that sides dead that won't help you any. If it's not the UVC wiring or connector, I'd trace the wires from the plug back toward the IDM looking for shorts. If you don't find any, pull the plug from the IDM and ohm the wires to check for continuity between the IDM and valve cover plug.

[Redneck_Steve]

Here are the fault codes I had:

P0562 System voltage low

P1670 Electronic feedback signal not detected

P1316 Ignition diagnostic codes detected

P1247 Turbo boost pressure low

Is there a place other than the harness where the signal to the injectors are split between sides of the engine?

Also, since all of the injectors on that side are not firing, it seems it would be a ground issue? It doesn't seem likely that all the hot leads would have a problem simultaneously.

[F350_6]

The center pin on the connector that plugs into the valve cover is the ground wire. The reason I suggested ohming the wires between the IDM and valve cover is this is starting to sound like you might have an IDM issue, and I don't know of any way to test the IDM besides swapping it out.

You could ohm the ground wire and see where that gets you, but I'm not sure if that would be the problem.

[Redneck_Steve]

I finally had a chance to do some checking. The ground wire has 0 resistance to the plug that connects suspended over the valve cover, this is the connection between the engine and firewall, square connector with about 20 pins. However, between this connector on the truck side and ground, I get a .14 with the meter set on 2M. I'm not an electronics wiz, so I don't really know if this is what I should expect or not.

Where is the IDM located? I'm having trouble following the harness at the firewall. I'm checking the hot lead on the front cylinder next.

[cpope]

easy solution...no shims...no new harnesses...

SUPER GLUE

after 3 idms a $2 tube of SG solved my problems.... harnesses were causing shorts that were killing the idms

I luv super glue almost as much as duct tape