TimeTraveller
Member
- Posts
- 20
- Location
- Scotland
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?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
I’ll report back on Sunday!
Cheers.