We have a problem with a 2002 Td5 110 Defender SW. It will start and run normally (engine management warning light not on) until the vehicle hits a bump in the road, at which point the fuse that powers the ECM blows and the engine stops dead. The obvious cause is a cable with damaged insulation somewhere which is shorting to earth (chassis, engine, body) when it gets shaken around. Looking at the circuit diagrams, it seems all engine sensors, instruments, injectors, etc. are powered from the ECM and so the fault could be in the cabling for any of these.
So far we have looked at all accessible cabling in the engine bay, behind dash, around gearbox area and cannot find any sign of damage. We have also rocked, shaken, thumped the car and all accessible wiring, connectors etc while it is parked with the engine running and cannot make the damn fuse blow! But as soon as we get 20 metres from the gate we hit a small bump and it stops dead.
Anyone got any ideas on likely places to look for a fault?
Or a more systematic approach we should be using to trace it?
