R32 Gtr 4Wd Fault

[GimpyDammit]

Been having this problem for quiet a while now. Have a power fc and the hand controller, tps voltage is .51 at idle.

When I start the car, everything is fine. If I use anything electrical (brakes, windows, headlights) the 4wd light comes on. But if I hold the revs at 2k it dosn't happen.

Read the code from the 4wd ecu and get 21 tps sen/circ

Ive tried swapping the 4wd ecu, running wires from tps to ecu, adjusting tps. Starting to run out of ideas.

Taken it to a few places and no-one seemes to be able to fix it.

Looked on quiet a few forums, but there don't seem to be any people having the same fault.

Any ideas?

[Duncan]

Yes, and it is actually fairly common.

It's likely to be a problem with earthing of the pump unit or the computer in the boot. Most often it is the pump unit because people forget to put the additional earth straps back on when they take the subframe out (eg replacing bushes)

[GimpyDammit]

If it were the earthing to the pump, wouldn't it pull a pump code?

The 4wd ecu has an extra earth to the bolts holding it in, I'll check the underbody see if I can find something

[Duncan]

I agree....that would make more sense.....but try it anyway