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Yes, it is possible for the ECU to be bad even if it is still providing codes to the OBD2 scanner. The ECU is a complex electronic device and it is possible for one or more of its internal components to fail without affecting its ability to communicate with the OBD2 scanner.
In your case, the fact that the codes went away after replacing the #35 fuse and the IAC motor suggests that those were the underlying problems causing the "crank but no start" condition. However, the fact that the car still won't start after those repairs indicates that there is another problem, and it is possible that the ECU is at fault.
To be sure, you would need to take the car to a qualified mechanic and have them perform a more thorough diagnosis. The mechanic may be able to test the ECU to see if it is functioning properly. If the ECU is found to be bad, it will need to be replaced.
Here are some other possible causes of the "crank but no start" condition in your Lexus IS300:
Faulty fuel pump
Faulty spark plugs
Faulty ignition coil
Faulty camshaft or crankshaft sensor
Low compression in one or more cylinders
Clogged fuel filter
Restriction in the air intake system
If the mechanic is unable to find any other problems, then the ECU may indeed be the culprit. However, it is important to rule out all other possibilities before replacing the ECU, as it can be a costly repair.
The code is for a failed throttle control motor or circuit. You might check to see if the throttle control is plugged in, otherwise you may need a shop manual to test the component.
o2 sensor codes dont nessesarily mean the sensor is bad. other things can set this code, like a vacuum leak, an exhaust leak by that sensor, or a bit of water in the gas. I clear the code and wait to see if it comes back up. if it does then check for leaks. if there are no leaks it can be check with a scanner that will read datastreams from hte car computer. or manually check it with an ohm meter
temperature blend door actuator is the name and the little plastic gears has wore out you will need to replace two choices the lexus dealer or salvage yard you decide
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