The two drawings of where the sensors are will help you look to see what you have fitted there in place of a sensor and maybe find the plug for it hanging loose?
It's a very old car (2002) and potentially many previous owners. These previous owners may have made modifications or even engine swaps from a different vehicle in its lifetime. This may explain why the diagrams don't match the car. The TU3 was used in several different makes each having their own model specific features.
The electrical diagram shows you the power supplies and the signals to the fan control and these are used in conjunction with a multimeter to check supplies and signals.
The checking of supplies and signals should have been done before replacing the fan because it my not have been all down to a broken fan but rather the control system for it (sensors, plugs, sockets, fuse boxes, cables, ecu etc).
If it was mine, I would run up lexia
to get the fan spinning to see that it is consistent and not intermittent.
I would also go and look to see what was fitted where the other sensor is shown on the diagram because it's not there, something must be there? Even if it is to stop the water escaping.