I got an 05 lly in and the customer wanted DSP5 put in. he had a tune from another shop in town but wasn't happy with it. so I pulled the tune and there was minimal changes made but I started with a clean stock tune. I drove the truck after I had downloaded the tune and scanned it to make sure it was healthy as it has 180k on it. everything looked good. got back tot he shop and went to flash it and put a switch in. I first pulled the fuses like we all do on LLY's and that's when I noticed he had changed out all his fuses and replaced them with some kind of circuit breaker. when I licensed the ecm (here is where I could have made a mistake) I was watching the messages and it said something like "searching" or "trying" and I noticed the data port cable wasn't connected. I connected it while it was trying to license it and it seemed fine and ,went ahead and licensed it, told me to cycle the key off and that was normal. but after that it wouldn't flash, would not crank, nothing..... I uses the scan tool to see if it would communicate and it seemed to. but when I selected the tool to get the OS number and VIN all of them said N/A
Now it gets better.....I thought maybe it just blew a fuse, I checked them and of course due to these stupid circuit breakers you can't tell. I checked for power at the ecm on the pink ignition wires and had none. then checked the 4 fuses that send the ecm ign volts and they didn't have power either ON EITHER SIDE OF THE FUSE. it burnt up the bus bar inside of the fuse block and has no power to either side pf those 4 fuses. (I've seen this before when a guy tapped the wrong side of the fuse for gauge power) I used a power probe to sent 12 volts to the 4 fuses and see if the ecm would talk or flash and NO GO. I happen to have a good used fuse block from a gas 2500hd and if looks like it will work but I don't want to burn it up again. I know I will need an ecm. worst part is I had a good LLY ecm and sold it to a guy on Tuesday.
Did connecting the cord while it was trying to license it cause all this?
Now it gets better.....I thought maybe it just blew a fuse, I checked them and of course due to these stupid circuit breakers you can't tell. I checked for power at the ecm on the pink ignition wires and had none. then checked the 4 fuses that send the ecm ign volts and they didn't have power either ON EITHER SIDE OF THE FUSE. it burnt up the bus bar inside of the fuse block and has no power to either side pf those 4 fuses. (I've seen this before when a guy tapped the wrong side of the fuse for gauge power) I used a power probe to sent 12 volts to the 4 fuses and see if the ecm would talk or flash and NO GO. I happen to have a good used fuse block from a gas 2500hd and if looks like it will work but I don't want to burn it up again. I know I will need an ecm. worst part is I had a good LLY ecm and sold it to a guy on Tuesday.
Did connecting the cord while it was trying to license it cause all this?
