Going back to an earlier reply in this thread, I am back home now (had a good run back from N.Wales).
You were asking about temperature thermistor, AFM and ECU. In simple terms, the Hot Wire air flow meter has a heated wire and an unheated wire; these are the compensating and sensing wires in the air flow meter. There is a control box on top of the air flow meter and as I understand it, the compensating wire reacts to the incoming air and the control box compares the sensing and compensating wires to give an output signal to the ECU. Air mass is related to temperature.
The ECU also needs to know about engine temperature and also fuel temperature. The fuel and coolant thermistors send signals to the ECU which will increase (or decrease) the injector pulse depending on the temperature.
so I take it the fule temp sensor is the thing on the pressure loop/rail that looks like it has an injector wiring plug on it?
If any of the sensors fail, the ECU will default to limp home mode - this is a basic fuel map that enables the engine to run but it runs very rich. I had a duff ecu that couldn't read the air flow meter, I found I had to disconnect the air flow meter. I was getting an average of just 6MPG. You know when something is not right because the EFI warning light should come on. If there is something very wrong and no light, it could mean you have a bad ECU.
I would suggest anyone with a 14CUX ECU to get a spare one; has saved my behind before now I know.
Anyways, hope that is of some use/help.