Could Someone Please Explain - Ford Powerstroke Diesel Forum
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post #1 of 1 Old 11-22-2011, 08:14 AM Thread Starter
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Could Someone Please Explain

I'm sure some of you have probably seen some of my other posts about this, so please bear with me. I hate to ask what is probably a very elementary question, but I'm trying to get my head around exactly how the DPF and EGR sensors work. Some are pressure sensors and some are temperature sensors, that much I got. What I'm wondering about, is do these sensors have electrical connections to them? In other words, when the proper conditions exist to trigger a sensor, how does it communicate back to the computer to set the appropriate code, or start a regen, or whatever? I would think it would have to be physically wired somehow to accomplish this. For example, if I get a P2454 (DPF Pressure Sensor "A" Circuit Low), wouldn't that mean something in the electrical path is failing, and not necessarily the sensor itself? I would think so, especially since the sensor itself has been changed recently. I've got a gremlin that keeps throwing this code and setting the "check engine" light (although it's not on as of this writing). That's how I know the sensor is new. It threw the code and turned the light on so I took it in to the dealer. However, it's done it a couple of times since then which tells me it's obviously something else. Since I haven't had time to take it back to the dealer, I've just reset the codes so that I don't have to look at the light. I know that's not the best way and that the problem is still there and that I need to take it back in, but I mainly just want to know how the sensors communicate with the "mother ship", so to speak.



2008 F350 Lariat 4X2 CC 6.4L
dark blue over grey
totally stock and love it that way

Last edited by cp2146; 11-22-2011 at 10:38 AM.
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