Throwing an IDM Code...ugh...
Thread Starter
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Laughing Gas
Joined: Feb 2004
Posts: 1,080
Likes: 1
From: Elsinboro, NJ
Cleared all the codes, put in the known good IDM. Ran buzz test. P1274 shows up again. Ohm'd the new harness from the 42 pin. Every one came up 3.6 ohms.
#4 wire from 42 pin to IDM is still at 0.6 ohms.
I'm at a loss.
Not a solenoid, not a uvch, not a valve cover gasket, not an idm.
What the heck am I missing?????
#4 wire from 42 pin to IDM is still at 0.6 ohms.
I'm at a loss.
Not a solenoid, not a uvch, not a valve cover gasket, not an idm.
What the heck am I missing?????
Thread Starter
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Laughing Gas
Joined: Feb 2004
Posts: 1,080
Likes: 1
From: Elsinboro, NJ
With the same miss it had when I started this. That was the reason for my last post.
Here is a recap of what has gone on so far.
Got in it my buddy's pole barn. Spent the whole day on it yesterday and here is what we (Doug Brown ((Thanks Buddy)) and myself) have done so far.
Swapped #4 solenoid to #2 injector, replaced valve cover gasket and UVCH. Cleared Codes ran buzz test and still came up with P1274. Ran a Cylinder Contribution Test and got P0272 #4 Cylinder Balance Fault.
We ohm'd the wire on the 42 pin connector with the new harness. Every came in at 3.6 for the driver's side bank. Ran a continuity test on the brown/light blue wire from the male pin side of the 42 pin connector to the connector at the IDM plug. Had continuity and ohm'd at 0.6 ohms.
Replaced IDM with a known good one from another Super Duty. Plugged everything back in and ran buzz test on AE. P1274 shows up. Started the truck and ran another Contribution Test. P0272 comes back again.
Couple of question:
Can this in no way be a tuning issue?
Something in the PCM can't be causing this can it?
Am I looking at the right wire, Brown with Light Blue stripe?
Do I just need to take all the loom off the harness and trace the said Brn/LT Bl wire back to the IDM?
Here is a recap of what has gone on so far.
Got in it my buddy's pole barn. Spent the whole day on it yesterday and here is what we (Doug Brown ((Thanks Buddy)) and myself) have done so far.
Swapped #4 solenoid to #2 injector, replaced valve cover gasket and UVCH. Cleared Codes ran buzz test and still came up with P1274. Ran a Cylinder Contribution Test and got P0272 #4 Cylinder Balance Fault.
We ohm'd the wire on the 42 pin connector with the new harness. Every came in at 3.6 for the driver's side bank. Ran a continuity test on the brown/light blue wire from the male pin side of the 42 pin connector to the connector at the IDM plug. Had continuity and ohm'd at 0.6 ohms.
Replaced IDM with a known good one from another Super Duty. Plugged everything back in and ran buzz test on AE. P1274 shows up. Started the truck and ran another Contribution Test. P0272 comes back again.
Couple of question:
Can this in no way be a tuning issue?
Something in the PCM can't be causing this can it?
Am I looking at the right wire, Brown with Light Blue stripe?
Do I just need to take all the loom off the harness and trace the said Brn/LT Bl wire back to the IDM?
Thread Starter
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Laughing Gas
Joined: Feb 2004
Posts: 1,080
Likes: 1
From: Elsinboro, NJ
No, just that one. 0.6 Ohms is what my meter reads when both probes are touched to each other so I figured that when it read 0.6 ohms through the wire it had a good connection.
Logistics Pro
Joined: Oct 2011
Posts: 3,953
Likes: 120
From: Mcdonough, GA
Try hooking everything back up except the IDM connector and the plug to the injector. Now ohm the wire run to to ground. You can hook the meter to it at either end, IDM or injector but leave the other end open. Shake the harness with the meter hooked to it. This will make sure it's not grounded somewhere.
Laughing Gas
Joined: Mar 2008
Posts: 967
Likes: 7
From: coquitlam,BC
I suppose it could be your main harness but if it was running fine awhile ago there must have been some damage to the harness to cause this.There is a ground shield wire that runs inside your main harness. Maybe that wire ( #4 injector) has been damaged and is touching it. Although the last post should show that. You could also go to GB Remanufacturing web site. They have some good info on the 7.3 injector system.
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Thread Starter
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Laughing Gas
Joined: Feb 2004
Posts: 1,080
Likes: 1
From: Elsinboro, NJ
Ok, I'm back on this today. Just disconnected 42 pin connector and harness from IDM. Ran an ohm test on the #4 wire from the 42 pin to ground. Open circuit, so wire is not grounding out in that harness. Ran ohm test on #4 from 42 pin connector (engine side) to ground. Open circuit so not ground out there. Talked to gear head and they said run same test I did. If it comes back with no results they said try a different PCM. I have a few feelers out to see what we can come up with. I need one from an 02-03 automatic. Anyone????
Thread Starter
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Laughing Gas
Joined: Feb 2004
Posts: 1,080
Likes: 1
From: Elsinboro, NJ
I also ohmed the #4 wire to every other wire in the 42 pin connector to see if it was making contact with one of them. Had open circuit for all. Thinking it's not the wire harness at this point.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
It sounds to me like you tested everything except for two things - the actual connection on pin 6 of the 42-pin connector and pin 7 on the IDM. Everything from the female connector to the engine reads good, and everything from the male pin to the IDM female connector reads good. It's starting to sound like one of the male/female couples are not... er... coupling. This sounds like you need to ohm between pins 7 and 23 on the IDM connector (with the 42-pin connected).
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
I think I've been following this. I take it that he has focused very closely on everything associated with the brown wire with the light blue trace. It's pin 6 in the 42-pin connector, and it's pin 7 on the IDM connector. This wire's sole purpose in life is to provide a ground signal to the #4 injector solenoid when the IDM commands it. P1274 and P0272 trouble codes and a missing cylinder say this one wire is not up to the task, even though it checks out by meter when looking from connector to connector. Swapping injectors didn't move the problem - it stayed with #4.
Two IDMs are swearing on a stack of bibles that there is no connection between pins 7 and 23 on the IDM connector - this is the loop through injector #4. I say the only thing not tested yet is when that brown/lt blu wire passes through pin and socket #4 on the 42-pin connector. If pin 4 does not make good contact with socket 4, it fits everything above.
Did I get it right, Mike?
Two IDMs are swearing on a stack of bibles that there is no connection between pins 7 and 23 on the IDM connector - this is the loop through injector #4. I say the only thing not tested yet is when that brown/lt blu wire passes through pin and socket #4 on the 42-pin connector. If pin 4 does not make good contact with socket 4, it fits everything above.
Did I get it right, Mike?
Thread Starter
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Laughing Gas
Joined: Feb 2004
Posts: 1,080
Likes: 1
From: Elsinboro, NJ
You guy have it. When I'm referring to #4 I am in fact referring to the brown/light blue wire. I figure it was easier to refer to it as that because they have different addresses on the 42 pin connector and the IDM. Paul, I will try that tomorrow have to to do some electrical work to in a basement.