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I just went through a very similar situation. I had injector circuit high codes for cylinders 2 3 5 8. What do these have in common....all are controlled at the X2 (middle) connector plug on the FICM. I was reading all of the proper FICM voltages at cranking and start up. I traced all the injector pin locations back to the FICM. The "coil power off" signal pins for those injectors all share the same connection on the logic board inside the FICM. I swapped in a known good FICM for a quick check, all the codes cleared and the truck ran fine. This may just be the problem I was having, but I would check that first. All the codes showing up for cylinders on the same connection is more than a coincidence.
If the FICM swap doesn't work. The injector harness should be checked for a short.
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2004 (9/16/03 build) 6.0 FX4 Lariat CC
6.5" Pro Comp Lift with Dual MX6 Shocks up Front, 37" BFG KM2's, Power Slot Cryo Rotors & Hawk Pads, Moog Ball Joints, 4" MBRP SS Turbo Back CAT Delete, Coolant Filter, RCD EGR Delete, Zoodad, Harpoon, blue fuel pressure spring, ScanGaugeII, updated turbo drain pipe
Last edited by fixxxer-upper; 01-05-2012 at 06:57 PM.