I don't know much about Autel, but there is a comparison of tools here https://www.landyzone.co.uk/land-rover/freelander-1-diagnostics-what-actually-works.378679/ Have you tested continuity from pin 7 of the diagnostic socket to the correct pin...

I fitted the V6 propshaft in the end, as it seemed to be in the best condition of all the propshafts that I have. I stuck some tape on the shaft both sides of the VCU and moved the car about 50 metres. The tape still lined up. Also it's...

yes most of the ECUs are on the same diagnostic line, so, even though the 16 pin socket is inside the passenger compartment you will be able to find the wire on the engine ECU and create your own 16 pin socket in the engine compartment. Very clever.