ok there is no mass airflow sensor it would be a map sensor thats probably coming up,all of the sensors are 5 volt supplied sensors and i have a few diagrams here. the orange wire to the sensors are the 5 volt wire from the pcm.
yes it is most likely the cause of your no start. tell your husband to start at the easiest sensor to get at, this is usually the map sensor or the throttle position sensor and measure the voltage with a volt meter on the orange wire it should be near 5volts. let me know what you have and we can go from there.
i have all the wiring diagrams for the entire car but its broken up into components so if you can tell me what particular component you need a diagram for i will get it for you.
also if you didn't have any problems with the car running prior tell your husband to inspect the transmission bellhousing area for any wires that may have gotten pinched when the motor was being installed. i have done this before and it is pretty easy to do.
i have 2 more here that might be of some use one is of the ignition coil and the other the auto shutdown relay.
tell your husband also if he measures less then 5 volts at one of those sensors go around unplugging one sensor at a time and see if the voltage comes back up to about 5 volts i have seen crankshaft sensors go bad internally and it will pull the 5 volt wire down to about 1 volt and then the car wont start.