I've purchased my first F350 PSD and I'm adding some stuff to it. One of the things I'm adding needs to tap into a couple of wires going to the ECM, but I don't have any idea where the ECM is located on my truck. It's an early 99 model F350 with a 7.3 L diesel. I've already added a chip to the PCM, but there seems to be some confusion about what a PCM and an ECM is on another forum. To be frank, I have no idea, but I suspect they're different. Could they be combined? I don't see how.

 

They're the same thing. You have 3 major Modules: PCM(or ECM), IDM, and GEM. What are you tapping into? Be extremely careful as to not fry ANY of the above. Very expensive "whoops".

 

It's for a BD TorqLoc and exhaust brake. Unfortunately, with all the little production changes that go on, it's hard for an aftermarket supplier to put out a set of instructions that fit each truck exactly. Unfortunately for me, it gets a little confusing.

 

Look at page 9 here.

http://www.dieselperformance.com/pro...5_Torqloc4.pdf

It tells you that what you need on your truck is on the PCM. Some other makes (in this case Dodge) calls it an ECM.

 

PCM is (I believe) Powertrain Control Module - which includes Engine (ECM) and Transmission brains.
In the gassers, the PCM is between your left foot and the parking brake pedal mechanism.

 

Same place on the diesels.

 

Excellent, thank you. I was thrown off because in the instructions for the TorqLoc it says to splice intp a couple of wires in the ECM. I called Cam at BD and he confirmed that there's no ECM on my truck.

I don't want to even think about the time I spent researching this over the weekend. Hours looking for an answer when I could have been flippin burgers on the barbie.