Cat Lift Trucks (& Caterpillar) P6000:
Wiring Help/no reverse/forks will not go down

I have a few problems to throw at you pros to see if you can help me please.

1) on the right side, on the right side of the vehicle control module, what does the 2 green with red lines go? They plug into the side with their own plug but where are they supposed to go? I have found the same color wires coming from the shift lever, going into the left side of the VCM, so I'm assuming these wires are the out but where are they supposed to go?

2) what I am assuming is the transmissions speed sensor, there are no wires going to it. They are broke off at the sensor. This is on the right side of the transmission at the front.

3) there is another sensor located just below and to the left, towards the back. What is this?

4) the forklift will go forward but will not back up

5) the forks will go up but not come down

These problems happened at the same time. It was doing fine then after one of my guys pressure washed it, it stopped backing up and the forks will not go down. I figured a wire got cut or something but the only wires I have found not attached are the green with red. I have traced every wire through all of the harnesses and this is the only ones I have found broken.

Of course the guys all say it was running fine after pressure washing and they didn't do anything to it.

Codes F34 comes up every time it's started and F87 comes up when it chooses to upon start up.

I just replaced the VCM because the old one had rusted and was full of water after the wash but it didn't help anything.

So I am out of ideas. Can anyone help me out please?
  • Posted 25 Nov 2023 08:44
  • Discussion started by Jody_Harrison
  • Alabama, United States
Jody Harrison
Iron City Contracting LLC

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