I had a P0276 cel come up on Sunday. I had just changed my fuel filters so figured it had something to with that. I deleted and it just came back tonight.
Can anyone help me understand what that code means?

 

That is #6 injector circuit low. Check the connection at the harness for starters where it plugs into the injector pigtail.
What is the output on your FICM?

 

I just checked the connector on #6 Looked just like the others - clip in and snug.
I should also mention that on Sunday when i started it just before P0276 came up, I thought it sounded like it was skipping a bit on warm up. Seemed to run fine though. Didn't drive it on Monday and today it sounded good on start up and still running normal as far as my limited experience says.
I dont know how to check the FICM voltage yet. I guess thats next.
Thanks

 

Odds are good that the skipping you felt was #6 missing a few beats.
You need to get something to monitor data live. A Scangauge II or something else if you don't have it yet.
You can check the FICM voltage at the FICM under the hood but not the most convenient, and you might risk shorting something out with the test leads.
The ability to monitor things on a 6.0 is pretty crucial to many things.

 

I have an Edge Evolution setup since I bought the truck. Monitoring EOT, ECT, Bat V, EGT
Eventually, I will also have gages for Fuel pressure, Coolant Pressure FICM Volts and Batter volts at the batteries.

 

My next steps will be to check the FICM voltage, pull the batteries and alternator for load/bench tests.

 

The Edge should do that if programmed correctly. Google it to be sure, I don't run one or I'd confirm that for you.

 

Watson is correct - the Edge should be able to check voltages. If you have a singular circuit low code, checking voltages is certainly reasonable. Also reasonable is unplugging and re-plugging the FICM in just to ensure that connections are solid.

I'd also suggest pulling the alternator, specifically looking to see if your voltage regulator is shot.

If your FICM's output voltage is okay (45-50 when cold is spec), and the cir high code continues, chances are solid that the issue with the truck is with the logic side of the FICM.

Conveniently, we work on both sides of the module and can help you out!

Hope this helps!

 

I had something similar to what Ed mentioned with my FICM before I sent it in, likely was related to the fact FICM was getting weak, even with good readings.
I don't remember now which cyl it was but it may have even been #6 as you are seeing and one other one.
I cleared it and it didn't come back, however I sent the FICM off about a week later, so I won't say for sure that was the problem.
That said, everything else checked out good so I am leaning towards the FICM. I have not seen the code come back since then.

 

Ed, I was planning on calling you. we had talked few weeks back when I bought the IPR EGR delete. I wanted to have the batteries and alternator checked first as well as the FICM voltage. I'll "exercise" the plugs on the FICM as well.
I read your site today and see where you stated Low Circ codes are almost always week batteries/alternator which I know can kill the FICM.
I checked my Edge Evolution and don't see were it can monitor voltages other than Battery. But it was you who said the voltage needs to be checked at the batteries - Min 13.3 hot idle, which I take to mean "not at the OBDII port"
Let me know if you have any other suggestions. I'll post back when I have test results unless I call you first.
Thanks!

 

Navistar,
I read somewhere today that the low circ side was hooked in paralellel to all the injectors in the bank so its likely to get all 4 at once. But in this case its only #6 which I think points to a wiring or connector issue specific to #6. I"ll have to see if I can find where I read that ( I read a lot of FICM related data today)
Thanks for your input!

update: this is where I read about the low circ hooked in paralellel:
http://dieseliq.com/6-0-power-stroke-ficm-diagnosis
The specific text......

FICM Voltage

The FICM internally generates 48V used to drive the injector solenoids.

Each individual injector is controlled with four driver outputs from the FICM. There are high and low side drivers for the open and close coil of each injector.

On 2004.25+ (1845117C2 FICMs), the low side driver is actually shared among 4 injectors. This means an injector short to ground on the low side could produce four different cylinder error codes. On 2003.25 (1837127C4 FICMs) there are individual low side drivers for each injector. This means a low side failure would result in a single injector error code.

Note: International FICM part numbers are located on a label on the connector side of the module.

 

Batteries Tested good. They were at 12.49v each when i took them out of truck. After a full, smart, bench charge they were both reading 12.80v after 12hr rest.
Alternator checked good as well.
At cold idle reading 13.8v at the batteries. Took it for a 20 minute hard ride and ran great.
At hot idle reading 13.6v at the batteries. CEL stayed off but that may change tomorrow on ride to work.
I'll check the FICM voltage on Saturday. If that checks good and the CEL light stays off, I'll make plans in week or two to send FICM to Ed for a once over and maybe a tune.
Otherwise, I'll be talking to Ed little sooner
I also need to find all the ground straps, get them cleaned up and bolted back down with dielectric. Anyone know the locations of them all?

That sucked not driving my truck for 3 days. My wife's Milan felt odd and weird to drive.

 

FICM voltage check:
48.5v ignition on, not running
42.3v running.
I believe the spec says it has to be above 45v

 

She appears to be getting weak. I'd take care of it as soon as possible so as not to harm any of the injectors.

 

Yep, time to send the FICM in. 45V is too low. Do you have or have you also considered a updated FICM tune?

You can read about those on Ed's site as well.