LB7 Wiring Issues?

[bulletcamel]

2002 LB7 fuel gauge circuit code P0463, AC sensor circuit code P0530, oil pressure circuit low signal code P0522, security light always flashing and battery light on, abs light on, truck has a miss at idle and occasionally throws a transmission low signal code injectors are brand new and rates are good no injection codes. Is this awiring issue or all separate issues?

 

[2004LB7]

Try the easiest one first. Clean the ground connection on the frame below the drivers side door. When that one goes, it does all sorts of weird stuff and triggers codes that can be hard to pinpoint

 

[bulletcamel]

i have cleaned/replaced every external ground on the engine and frame i cannot find the drivers side interior ground to clean

 

[2004LB7]

 

[TheBac]

Yep. ^^^^ That was the root cause of many, many weird codes.

 

[bulletcamel]

i only have one ground connection in that area on my truck and ive changed the end and cleaned the frame to bare metal

 

[2004LB7]

i only have one ground connection in that area on my truck and ive changed the end and cleaned the frame to bare metal

Earlier years only had one.

Have you inspected the pins in the two large bale connectors? Make sure none have backed out or are bent?

When did the issue present? Right after the injector replacement or before?

 

[bulletcamel]

i just bought the truck for a good deal it has the paperwork for the injectors last October so im not sure when the issues started i checked the upper smaller bale connector but i didnt have the diagram for the larger one so i will have to check that one tomorrow all i know right now is the resistance from battery to any ground is 8 ohms and the voltage at the AC connector is 10v no breaks in any of the wires ive checked and i have every wire loom open under the hood

 

[2004LB7]

Resistance to ground from the battery being that high is suspicious. I'd carefully inspect the cables from both batteries and where they connect to the frame. Corrosion inside the cable or right at the crimp can cause high resistance

 

[Ron Nielson]

I would use a single battery cable, with one end clamped to the negative terminal of the battery and the other end to a good metal connection on the block. See if the problem is fixed or improved. Try the same thing to the frame. The object is to temporarily wire around the bad ground(s) somewhere in your electrical system as a temporary fix.