2002 Toyota Avensis Fan not cutting in

Yes the engine is of the same year make and model and the temp sensor is the same. The fan relay is has been checked and it is also ok so I think it must be the engine temp sensor. Thanks for reply.

Hi again I just got diagnostic completed on the engine and the engine management light appeared and said engine temp sensor the one in reads in the minus (-) at the moment. Never had a problem with this issue (fan not cutting in) with my old engine but I did change thermostat and put new rad in with new engine.I have been told that the sensors in this model have been know to give problems so more expense with buying a new one. Can you tell me that by replacing this sensor that the fan will cut in and problem solved.

The sensor from my old engine seems to be slightly damaged also has 230k on it the sensor from the engine that has been just put in broke in 2 pieces coming off badly corroded don't know if my old one got damaged when the engine went completely the first time. Will have new sensor tomorrow and I am not a betting man but my gut feeling is that this problemwill still be there when new sensor is put in. THANKS AGAIN.

Hi again the car is now at the auto electrician seems that the sensor was not the problem as I thought now I am told that the sensor was working and is sending a signal to turn the fan on but it seems that the ecu is not sending a signal to the fan to switch on, my options at the moment are to fit a manual switch in the car so I can switch on when the temp gauge starts to rise not too bad as the fan rarely has to switch on but still not good enough I suppose and the other is to get the ecu from the car where I got the new engine have it re-programmed and hope that works. Any other ideas?

Yes you are right the fan relay was checked and is ok, not sure what BCM is but the engine temp sensor is sending a signal. When you say have it flashed what does that mean. Anyhow thanks for your time.