Discussion Starter · #1 ·
Hello all. I fix one thing and another pops up on this truck and here is the latest thing I can’t figure out. I lost the CP4 on my truck last summer. Ordered everything and replaced CP4, injectors, lines, rails and all that. Also did a SPE disaster prevention kit while I was in there along with an egr delete and ccv reroute. Dpf is still on the truck but emissions are turned off with a mini maxx. I want to make Sure it’s running fine before I spend more money on a delete pipe. After a headache of months waiting on parts that got shipped wrong I finally got the truck put back together and running a month ago. Had a P0193 code and was running rough. Got busy with work so it sat in my shop another month but finally was able to take it in to get the flow rates For the injectors done this week. Truck ran decent on the way to town to get injectors programmed (10 miles) but in reduced power mode from P0193. Had them trouble shoot that while they had it for injectors and they came up with shorted to voltage. I picked the truck up and went to the gas station to put some fresh fuel in it and drove it back to my shop. Truck runs fine now but still in reduced power and has to turn over longer to start. I unplugged the FRP sensor and have 5volts on grn/vlt signal wire and 4.5 volts on blue/vlt return wire. Psi is maxed at 31.5k psi with the sensor plugged in or unplugged. I unplugged two of the three connectors from the PCM, I left the main power connected, plug furthest to the passenger side, and had 4.5 volts on the return pin and harness from sensor plug back to PCM is in good shape. No bad spots and ohms good. I ohmed every other pin back to that return pin to try to see where it was coming from but there’s no continuity between anything. Does this sound like a short in the PCM or will a shorted wire or shorted sensor on the same vref feed through the pcm like that? First issue I had with the truck last summer when I bought it was the ac compressor was intermittent and then stopped working and I know that the FRP and ac system are on the same vref but I had no fuel related issues/codes up until it died on me when the pump went. Currently Still have the P0193 but that is the only code. Any insight or schematics would be greatly appreciated before I pull out the rest of the little hair I have left. Thank you.