Is this a four-cylinder or V6 engine? The engine control computers are not known to go bad on either. When you turn the ignition key to the on position does the check engine light illuminate normally? Do you have a scan tool to verify that there are no code set in history? If the battery cable was removed or the battery went dead the codes would be lost but if the engine is in a no start condition now there may be codes sent and you would need to read them with a scan tool. You can check the injector pulse at the injector connectors with a noid light or a simple test flight will work also just be careful you do not spread the female pins inside the injector connector. The camshaft sensor and crank sensor work in correlation to control spark and fuel injection pulse. Make sure that you have good strong spark to all four cylinders or six cylinders.
ASE Certified Technician
25 YRS. TOYOTA EXP,