Thread: M and S lights, turns over but no start

I've just checked and when cranking there is no reading on the tacho, wondering if this means it may be a CPS sensor failure that's not letting the fuel pump work? This is on an auto td5 if that helps

M&S lights can mean a few things engine related. It can be cam signal error, or it can be the XYZ switch, but you say it's cranking. Low battery can definitely cause the cam angle fault. CPS won't usually trigger the M&S, but it's a Disco so never say never. Thing is, I think if it sets the code, regardless of whether you have charged the battery, it will need to be cleared. Could be wrong. The no tacho reading could be the CPS, however I still don't think it will set this code and flash the M&S. Is the MIL on? That should be if it's the CPS.
Do you own or have access to a Nanocom? It's probably the only way to sort this.

Oh, have you checked for oil in the red plug on the ECU? That can cause all sorts of weirdness, and unless you have an upgraded injector harness you WILL get oil there at some point. Oil can even travel from there up into the engine bay fuse box. A good spray in the plug, both on the harness and the ECU could help, but make sure you use something that dries quickly with no residue, like an electronic contact cleaner. Leaving it wet with anything at all will cause problems.

Originally Posted by Tins

M&S lights can mean a few things engine related. It can be cam signal error, or it can be the XYZ switch, but you say it's cranking. Low battery can definitely cause the cam angle fault. CPS won't usually trigger the M&S, but it's a Disco so never say never. Thing is, I think if it sets the code, regardless of whether you have charged the battery, it will need to be cleared. Could be wrong. The no tacho reading could be the CPS, however I still don't think it will set this code and flash the M&S. Is the MIL on? That should be if it's the CPS.
Do you own or have access to a Nanocom? It's probably the only way to sort this.

I get a battery light, hdc or sls light lights up occasionally, no check engine light but the glow plug light also stays permanently on

No access to a nanocom, may be the case that I need to purchase my own one now ... My mechanic has a discovery 1 but doesn't have a nanocom as I've asked before about setting new heights for the sls

Only other thing I can think is there is water getting in the driver's side windscreen, as this was the issue I was about to try to fix today before I couldn't move the truck into the sun, so water has been getting into the dash on the driver's side

Originally Posted by Adarewyr

I get a battery light, hdc or sls light lights up occasionally, no check engine light but the glow plug light also stays permanently on

No access to a nanocom, may be the case that I need to purchase my own one now ... My mechanic has a discovery 1 but doesn't have a nanocom as I've asked before about setting new heights for the sls

Only other thing I can think is there is water getting in the driver's side windscreen, as this was the issue I was about to try to fix today before I couldn't move the truck into the sun, so water has been getting into the dash on the driver's side

Hmm. The interior fusebox is notorious for getting corrosion from the water and causing all sorts of craziness. I had a thread about mine. Post #19
Not hard to fix, but fiddly.

And, yes, if you're going to have a TD5 and do stuff yourself then a Nanocom is almost compulsory. They sometimes come up for sale here and on the AULRO FB group, just be sure it is coded for D2 TD5 or you'll have to pay BBS for a code. You can still get them from BBS, but they cost... But, they do pay for themselves.

They don't work with the D1.

I've looked at getting one already, but was hoping to find one secondhand before I needed it! And yep I know you need to pay them again for the software for every different model and engine etc....


Just checked the red plug and everything looks clean, there is a little bit of water in the bottom of the plastic housing from a river crossing yesterday I suspect, but the plug itself all looked clean

Checked again, I've been battling with kids while I check stuff and it is oil in the plastic cover, and then I guess maybe a little residue on the connections so I will get some contact cleaner and see if that helps me at all....