Connect all the cables between the truck and your computer, start the scan tool software, turn the key on, click the green button in the upper left corner of the screen, when the window pops up select E35A LBZ ECM from the drop down menu and click OK. Now click the PID tab (or press F8) and scroll down to DSP5 Switch Voltage (LBZ-LMM) PID. I would also suggest you select the DSP5 Tune (LBZ-LMM) PID. Double click them to select them. Once they are selected, click the Data tab (or press F9). You should see those two PIDs listed. You can now see what the ECM is seeing by clicking either the yellow or red circle at the bottom center of the screen. The yellow will let you view without recording, and the red will let you view and record so you can save it to review later.
