Since the engine suddenly stopped in the middle of driving, it's probably an ignition problem. Ignition issues can take longer to diagnose because the symptoms often point to a fuel related issue (fuel pump, FPR, fuel filter, etc.). I would think a bad fuel pump would sputter for a bit before the car died. I had ignition problems with my 2000 Olds Intrigue. Took me two months (and numerous stallings) to diagnose it as a bad ignition switch.
Here's a forum question from an owner of a 1993 Camry whose car has the exact problem that you are describing: sudden stalling, cranking but no starting.
http://en.allexperts.com/q/Toyota-Re...y-ignition.htm
It points to a problem with the ignition module. Ignition issues will not throw a code, only emission/transmission issues. Your DTC-24 is an "Intake Air Temperature sensor signal".
Here's the full list of Toyota OBDI DTC codes:
http://www.troublecodes.net/Toyota/
Good luck.