I am trying to troubleshoot some problems with my truck and need to check out the IDM. I can't seem to find the darn thing. My service CD says left side of engine compartment, nothing else and no pictures. I have tried to trace wires, to no avail. I pulled out the air cleaner box and battery box to see if it happens to be underneath. Not there. I have a picture of it, so I think I know what I am looking for. It appears to look very similar to the PCM. Any help would be appreciated.