Bad IDM??? - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 12-24-2009, 08:46 AM   #1 (permalink)
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Bad IDM???

Hey guys, Newbie to the dieselstop. Want to pick yalls brain for a second. Right now I have a 10,000 pound paper weight sitting in my yard. Truck will crank fine but will not start. Changed the CPS. Changed the fuel filter, cleaned the bowl, fuel pump works. Ran the codes and got a P1293 and P1294. Those are the high side open right and left bank codes.

My question, with those two codes together, am I most likely looking at a bad IDM or bad wiring somewhere. I would think that if it was bad wiring I would only get one code, either the right or left bank, not both. That's just my thinking, I don't know that for sure.

Any input would be greatly appreciated.
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Old 12-24-2009, 10:45 AM   #2 (permalink)
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What scanner did you use to get the codes? If you have an AE scanner, preform a buzz and continuity test, that would rule in/out the IDM. May be the UVCH harness, one or both sides have become, corroded, burnt or detached. IMHO I would check trhe UVCH harness(s) 1st before replacing the IDM. Start on the drivers side, easiest to get to. The IDM is under the drivers side fender and is susceptacle to moisture and or water getting into them also.
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Old 12-24-2009, 11:06 AM   #3 (permalink)
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Thanks for the reply. I did not mention this in my o.p. but the truck was driving fine and then just suddenly died. It has not started since. There were no symptoms prior to. Would that still lead you to believe UVCH?
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Old 12-24-2009, 12:07 PM   #4 (permalink)
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you can also check this at the idm connector to see if harness or uvc harness is problem. here are instructions and pin out
http://www.gbreman.com/docs/techbull...eplacement.pdf
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Old 12-24-2009, 01:06 PM   #5 (permalink)
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Another spot to check is where the main harness bundle crosses the driver's side valve cover. Some brilliant engineer put the high voltage injector circuits on the bottom of the bundle where they can wear against the VC and short out. If that's it, then some electrical tape should get you on the road again.

Otherwise it's possible your IDM has fried itself.
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Old 12-24-2009, 01:22 PM   #6 (permalink)
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Thanks again for all yalls replies. I will take a look at all of that over the next few days. Christmas has turned a little hectic with only one vehicle to drive between my wife and I.
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Old 12-30-2009, 12:33 PM   #7 (permalink)
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Just another possible check. My 7.3 Ex 4wd would not start cold on the first attempt. The second attempt it started. I pulled codes with Actron scanner. I found P1670 and no other codes. After going through the wiring (in the manual not on the truck). I found the IDM relay that supplies power to the IDM is located in the power distrbution box on the driver fender well. I swapped the relay with another known relay, cleared the codes and so far the truck is starting much better than previous.

The IDM relay gets a lot of abuse and is easy to change, runs about $8 at AZ for replacement. They won't have the IDM relay but they have the blower relay which is the same ford part. So If you look for the horn, or blower relay at AZ they are the same as the IDM. The IDM relay is #302 in my power distribution box. A quick verification check is to swqp the horn relay 301 with the IDM relay to see if the truck will start.

This may not be the issue but my rule of thumb. If it cost over $100 it could not be bad. so go check the relay in the PDB.

Hope it works for you.

Ok,, 1st post on this site have a great day. vettdvr
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