Land Rover Discovery 2 2001 TD5 M+S Error (Now not starting)

Hello all,

I currently have an issue with my Discovery 2 - XYZ switch making M+S error (Today it does not start as well).

How it occurred:
- Last year I had the same problem and after a while (2-3 days) the problem disappeared
- 3 months ago I was driving in deep snow and I got the same error (this time it did not disappeared by itself)

What I did so far:
1) Checked one tutorial on YouTube on how to open the sensor and clean it (common issue) - I did this and problem is not fixed
2) Checked all threads on this forum and I learned that on connector for Pin 8 must have +12v (I measured 10.71 and BCU relay power on Nanocom 10.8 - this is while the battery power was 11.7-a bit low as I did not used the car recently)
3) Mounted the switch back on the car and now with contact on I have correct light on P but on R and N after few seconds I get M+S and it wont start, that was after adjusting the rotation as I am aware about it from video tutorial
4) Opened again the XYZ switch, clean again and checked the circuit as in the picture attached - here the switch picture is from internet and I draw on top of it. Mine looks good, no oxidation.

What I would like to understand is: I have 9 wires and I know one is 12V feed from BCU, I also saw a schematic showing WXYZ circuits (I imagine there are 2 wires for each of them making the remaining 8....so which are the corresponding wires were I should see contact in each of the WXYZ?

Or anything that could help me to check with the multimeter in each gear with the switch mounted in order to eliminate the switch and move on to the harness or other root causes that can lead to this problem.

Thanks in advance!
Andrei

Mate, I'd start by getting the batt up to 12.6 volts, or a new batt! Low voltage can throw all sorts of stuff out.

Now it is 12.7 (recharged and stable) and I plan to check again the values on Pin8 - just to see until tomorrow when I plan to spend more time on it. Thanks!

.

Battery value now is 12.2v

Andrei Boboc said:

View attachment 292104
Battery value now is 12.2v

Click to expand...

On Pin 8 with switch mounted in P mode and connected, I have 10.44v

Andrei Boboc said:

On Pin 8 with switch mounted in P mode and connected, I have 10.44v

Click to expand...

The good news is that now the car starts the engine

12,2V means that the battery is gone (60% after it was charged and stood a bit), measure voltage while cranking cos if it drops below 10.5V it mixes up the brains of an auto including the non start symptom...fit a new powerfull battery at least 110AH and 900 CCA, both figures are minimal for a Td5 auto to be "happy"

Finally fixed it!

The battery prooved to be good as I was also expecting due to the fact that it was just several months old and before the low value I belive I started the engine many times.

The root cause in my case was easy and I complicated it unfortunately.

Oxidized contact inside the switch, cleaned it but the assembly method was a wrong one. I had used nuts and screw. The nut was too high and it was touching the gearbox. Because this fact, it was bending just a little bit but enough to interrupt some contacts.

Grinded the nuts and now is exactly like the problem never existed ))

Thank you for the help!
I hope my case can help others.

Regards,
Andrei