P1316 and P1274 code but truck runs great????? - Ford Powerstroke Diesel Forum
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Old 12-03-2012, 08:54 AM
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Exclamation P1316 and P1274 code but truck runs great?????

Just installed new injectors, new UCVH's, and glow plugs.
Started the truck now I have codes:
P1316- IDM fault
P1274- Cylinder #2 High to low side fault.

Truck runs perfectly, no smoke, no poor idle, nothing.
I went through and did the Ohm test all wires from the IDM to test for shorts. I have direct short from Pin #23 and #24 to Pin #26 (IDM ground circuit) The tech file says it is supposed to be open, and that this will cause non repairable and immediate damage to the IDM. The truck still runs perfect.

Now the MIL light will come on the second that you start the truck, take it for a test drive, still runs great. MIL light will stay on when you are in the accelerator, but once you take your foot off the accelerator the MIL light goes off.

All pins to injectors ohm at 3.4 on all injectors.

Any ideas would be appreciated, since I need this truck running.
I know there are some extremely smart people on this site, please help me out.

Does anyone have any ideas?
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Old 12-03-2012, 09:08 AM
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I have been having the the same issue with my 2001 F350. The only difference is my code is a P1278 (#8 Low to High open). My truck runs just fine as well just throws a CEL when on the pedal then goes out when backing out of it, or when I reach cruising speed.

I've read that loose poppet screws can create an open circuit that will not ohm as open. I have not had an opportunity to pull my valve cover and check mine yet though.

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Old 12-03-2012, 09:24 AM
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That i could understand but these injectors have no miles on them.

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Old 12-04-2012, 04:05 AM
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I got the 8 injectors from World of Diesel, also known as Pensecola Diesel, These are re-manned units in the master kit, injectors, glow plugs, uvch's.
Don't they flow test these before sending them out?
I just don't understand how the injector can fire, pass CCT test, Buzz test, but have an open circuit?????????

How do I check to see if there is a poppet screw loose?
Will this drop my warranty?

Silvercrew, thank you for your input and help on this.

Last edited by probuilder; 12-04-2012 at 04:08 AM.
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