2002 Disco 2 non starter

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sierrafery said:
Hi mate.
Well done!... you did exactly what was needed to have a result... in a nutshell, the conclusion: the relay coil's command is on earth path from C0658 - 5 as the other side is live so when you measured across that and live you got the correct 14+ voltage at the ECU while at the coil was 3.8 - 4V, from the ECU the circuit is hardwired to C0573-9 at the back of the fusebox then through the fusebox to the relay's coil where you have that low fluctuating voltage... i'm 99% convinced that the problem is within the fusebox hence the relay clicking with ignition off cos that circuit has a resistive short to earth in there which creates the voltage drop with engine running and a leak to earth with ignition off as the other side of the coil is permannent live... if you want to be 100% you have to unplug C0573 and make sure there's no corrosion and if it's OK plug it back and be handy to let the fusebox undone somehow and insert the negative probe into C0573-9 or use a wire to splice in it and chek then... if you get that 14+V like at the ECU plug it means the wiring is OK and this command doesnt reach the relay's coil so a known good fusebox is needed... there are fuseboxes available on ebay or at the wreckers and not expensive , e.g https://www.ebay.co.uk/itm/Discovery-2-Fuse-Box-Cover-Engine-Bay-YQE000300-Land-Rover-1998-to-2004/183767889676?_trkparms=aid=1110001&algo=SPLICE.SIM&ao=1&asc=60096&meid=4e0f10bebb8e4aa288e63d38ff9ccbd7&pid=100008&rk=2&rkt=12&sd=172890397894&itm=183767889676&pmt=1&noa=0&pg=2047675&_trksid=p2047675.c100008.m2219
Click to expand...
Excellent, thank you Sierrafery. At least that sounds like better news than replacing an ECU (I think). I’ll get the fuse box out again this weekend and see if there is any corrosion or anything else obvious. I’ll do the multimeter check on C-0573-9. Failing that I’ll take your advice and replace the fuse box. A local dealer is breaking a good one so might be worth picking it up anyway?
I’ll report back on Sunday!
Cheers.
 
sierrafery said:
OK, good luck... seems that we are both working with aircrafts but in different ways cos i'm an ATC now :)
Click to expand...
If ATC means what I think it means, (in the UK it means Air Training Corps, of which I was a proud member for 4 years), it looks like a stressy job with shifts. No wonder you get tired.
 
sierrafery said:
Obviously, as a mentioned aircrafts m8 :) ... Stanley, it's in my profile since i've joined this forum 12 years ago :cool:... click on "information".... it's been there for ages: https://www.landyzone.co.uk/members/sierrafery.9153/
Click to expand...
Sierra, it was obvious to me that ATC meant Air Traffic controller, what else really could it mean? I was just being humourous. Though I don't spend time noseying around in people's profiles, but you have mentioned being tired through shift work and also working with planes as an avionics engineer. I haven't been on the forum as long as you. Some people take their privacy more seriously than others and you'll find naff all on mine!
 
sierrafery said:
Hi mate.
Well done!... you did exactly what was needed to have a result... in a nutshell, the conclusion: the relay coil's command is on earth path from C0658 - 5 as the other side is live so when you measured across that and live you got the correct 14+ voltage at the ECU while at the coil was 3.8 - 4V, from the ECU the circuit is hardwired to C0573-9 at the back of the fusebox then through the fusebox to the relay's coil where you have that low fluctuating voltage... i'm 99% convinced that the problem is within the fusebox hence the relay clicking with ignition off cos that circuit has a resistive short to earth in there which creates the voltage drop with engine running and a leak to earth with ignition off as the other side of the coil is permannent live... if you want to be 100% you have to unplug C0573 and make sure there's no corrosion and if it's OK plug it back and be handy to let the fusebox undone somehow and insert the negative probe into C0573-9 or use a wire to splice in it and chek then... if you get that 14+V like at the ECU plug it means the wiring is OK and this command doesnt reach the relay's coil so a known good fusebox is needed... there are fuseboxes available on ebay or at the wreckers and not expensive , e.g https://www.ebay.co.uk/itm/Discovery-2-Fuse-Box-Cover-Engine-Bay-YQE000300-Land-Rover-1998-to-2004/183767889676?_trkparms=aid=1110001&algo=SPLICE.SIM&ao=1&asc=60096&meid=4e0f10bebb8e4aa288e63d38ff9ccbd7&pid=100008&rk=2&rkt=12&sd=172890397894&itm=183767889676&pmt=1&noa=0&pg=2047675&_trksid=p2047675.c100008.m2219
Click to expand...
Hi Sierrafery. Been out on the Landy again today, following up on your last bit of advice.
I managed to get a good fuse box off of a local guy breaking a Disco 2, so I thought I’d just replace mine anyway. When I pulled out the connectors underneath, the one directly beneath the clicking relay was burnt and melted at the blue and purple wire (the ECU). I figured that was the culprit!
I replaced the connector and put everything back together. With the new fuse box and connector fitted, I took a deep breath and turned the key.

The engine started first time and purred. No flashing green lights either! Just took it out for a run and absolutely no problems.

There’s always a silver lining too. The guy breaking the Disco had a full set of Land Rover light grill covers. So I treated myself and the old girl is now not only running well, but she’s looking even better too.

Thank you for all your help Sierrafery, I couldn’t have done it without you.

Cheers mate.
 
Hi !

I'm new here and i fall here from google with my key word "c0573".
Are you aware of this modification ?
my td5 don't start suddenly.

www.landyzone.co.uk

TD5 no start and C0573 fusebox connector ?!

Hi ! I'm new here and i fall here from google with my key word "c0573". I have a TD5 engine with no start (starter run but engine dont start = zero fuel, no smoke = nothing !). I have check all classic stuff and i start to suffer some without solution for the moment (i have 4 bar pressure, new...
www.landyzone.co.uk www.landyzone.co.uk
 
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