You must have a short somewhere. Unfortunately a short coming off the ECU is a lot of circuits to check.
I am giving you the data lines for the truck. I am also giving you the PCM wiring diagram which has the dataoutputs and sensors labeled very clearly. There are 3 of them marked 1of3, 2of3, etc.
They will be the wires you want to follow more than the datalines asI understand that this is the computer board that keeps getting fried.
I gave you the PCM for the 5.2L engine, the data lines are not engine specific. If you have a different engine, let me know which one you have and I will give you the proper PCM diagrams.
Images (Click to enlarge)
Friday, December 23rd, 2011 AT 6:11 PM