YOu will need to do some testing to narrow down the cause of the no-start condition to a fuel, ignition, mechanical, or control problem.
(1) Check for spark by placing a spare spark plug
into the plug wires one at a time and watching for spark at the plug gap when the engine is being cranked.
(2) A fuel pressure and volume measurement is needed to verify correct fuel delivery to the engine. if fuel pressure is below normal specs, the engine will not start.
(3) Engine compression needs to be measured using a compression gauge to determine whether there are any mechanical problems.
(4) A scan tool will be needed to check for RPM reading through the powertrain control module. If there is no engine RPM signal, the engine will not start. Checking for fuel injector
pulse is also a basic test for a no start condition.
One or more of these things is not present if the engine is not starting; determining which one or combination of these basic things will give a point to determine what direction to begin testing to find the root cause of the problem.