871 code 2312

[dhirocz]

Been enjoying the ‘mostly troublefree’ experience since completing my inframe last year.

I replaced my ECM with a Cummins reman 1150 hours ago. Reflashed my @m*m^2 into it.

Replaced my pedal position sensor a few weeks ago. Was giving me a lot of errors and cutting boost under certain circumstances. No issues since then.

Today I end up getting a code 2312 (timing actuator driver circuit-condition exists), a CEL and swears as I am headed loaded towards Columbia on 26. It’s intermittent, but constant. The issue is followed by what feels like a random misfire. Quick visual doesn’t show any issues underhood. Turbo and actuator were both done in Griffin about 85k miles ago.

I can’t climb into VA like this so I’m planning on turning back to Savannah and taking it easy. Plan is to resistance check the wiring in the actuator wiring between the pigtail to the ECM for issues and verify proper power and ground. It’s the misfire that concerns me. Even as I type this, it’s randomly missing at idle.

Entire IFSM was built out of new Cummins parts and replaced when I inframed it. No issues until now.

Am I missing anything I should be checking?

[Nostalgic]

My guess would be internally shorted/damaged timing actuator if you don't have a wire broken or damaged. Plugs dry and free of fuel? Do you have a good used one to try swapping in?

[dhirocz]

I have the entire IFSM that was removed from the truck during the inframe, so yes. Any way to be able to tell which one it is short of just swapping them one at a time?

[Nostalgic]

(10-09-2022 )dhirocz Wrote:  I have the entire IFSM that was removed from the truck during the inframe, so yes. Any way to be able to tell which one it is short of just swapping them one at a time?

The safest way is to swap one at a time. I had a bad one out of the box a few years back and got
a short lecture when I explained how when I unplugged it, the engine smoothed out. Apparently if you do that, the ECM can go into a silent fit and quit controlling them at random and I just got lucky, so I can't recommend it. Of course if yours is dropping out enough to throw a code, the ECM could already be wonky, so even if it runs funky, I'd give it 10 minutes idling before swapping to the other bank. That all said, on mine, when I unplugged the bad timing actuator, the engine smoothed out - and when I plugged it back in, it shook and missed like crazy.

[dhirocz]

I found it. Broken wire at the actuator. I’ll need to get some pigtails to properly fix it. I wire nutted it together to get back so I can properly fix it.