Thread: Nanocom & D2 WXYZ positions

The other weird thing was that the transfer case is reading low ratio when in high and reads high ratio when in low, looking on the nano!

Originally Posted by John W

The other weird thing was that the transfer case is reading low ratio when in high and reads high ratio when in low, looking on the nano!

It's not right, but it is normal. The status is inverted for some reason.

Originally Posted by John W

Wondering if anyone can help me. I am having problems with the Auto-box going into limp home and it seems to be related to gear shifting. There is no N indication in the gear position on the dash when the box is in neutral (otherwise gears are indicated appropriately) and if I linger in neutral prior to shifting into reverse or if the shift is not swift and clean then it will go into limp home, flashing M&S. I think this happened after my auto was replaced with a reconditioned one a couple of years ago but the problem was not clear at the time and yes I am slack getting around to it at this late stage.

I have hooked up the new (like me with nano evo) to see what is happening and I get the following readings when looking at the Auto gearbox , (I think it was under inputs and general in the menu). O is for open, C for closed. I will put the readings in order of WXYZ. Park-OOOC, Reverse-OOCO, Neutral-CCCC, Drive-CCOC, 3-CCCO, 2-COOO, 1-OCOO.

The question is are these readings the correct ones particularly for neutral? If not, any suggestions as to what is at fault would be appreciated.

What fault codes are you getting?

Google for "Land Rover 4-Speed Electronic Automatic Trasmission System" (with the misspelling) you should find a pdf attached to a south african forum. This covers P38a and D2 versions of the Auto and ECU.

This chart gives the wxyz switch combinations
SelectorSwitch.pdf

Neutral should be CCCO. CCCC represents an intermediate position between D and 3rd. Infact most of the combinations look to be incorrect.

cheers
Paul

Thanks Paul the fault code is P0705, position switch monitoring.

I have just had a look at the selector switch PDF and the readings are like a mirror image of what I have. If you were to reverse the order of WXYZ on the PDF data then it would match what I have with the exception of the neutral that seems to be my problem. Working on that basis the Z position on PDF shows as open on Z where my one is closed but if I were to keep up the pattern the it is my W that should be open with neutral.

I wonder it this is just a quirk of my nanocom or could a plug be connected in reverse?

John

http://www.4x4community.co.za/forum/...4&d=1313492040

Grab the above PDF. There are diagnostic flows towards the end.

RAVE lists testbook fault codes 14 & 23 for p0705 do have a look at the flows for fault 14 and fault 23.

That is great thanks, will keep me busy next day I have off checking voltages at the auto box terminals! I will also crawl underneath to see if any of the auto box wiring connections could have an "alternative" arrangement when put back after the auto box transplant.

I appreciate your pointing me to the info.

I replaced an xyz switch feb 2011 it now needs another apparently. the local dealer also can't diagnose D2's as there software has changed and wont talk to older models. reading this thread is possible to service the switch.