Today, I checked continuity on various circuits relating to LPG fuel injection and the LPG pressure sensor.
I found no open circuits and very dang little resistance in the wiring either.
Thinking possibly the Injector Driver could be faulty, I pulled another Komatsu off of our dock and volunteered it to be guinea pig for an experiment.
I took the Injector Driver from the ailing truck and plugged it into the harness on the "test" truck and tried it out.
Truck ran for over 10 minutes, never missing a beat and no codes were thrown...........MIL stayed dark.
So I put the driver back on the ailing truck and hooked up the Hitachi SST to see what it might have to show after sitting the weekend.
Now the thing is showing 3 codes:
1240= "LPG_F/INJ1 MALFUNCTION (INJECTION)
1241= "LPG_F/INJ MALFUNCTION (NO INJECTION)
1245= "LPG FUEL PRESSURE SENSOR HIGH, INPUT MALFUNCTION"
I am getting all 3 of those DTC with the new ECU and the old ECU, plus with the old ECU I also get 0031.
I am beginning to think possibly the wiring inside the harness is "leaky" and having gotten wet when we washed the truck last week.............there is now some "cross feed" taking place that is scattering the ECU's brains.
I know this is scattering my brain some.
Anybody want to touch this?