NO SPARK WHEN CRANKING , HAVE REPLACED CRANK ANGLE SENSOR 2007 ELANTRA , THE INJECTORS ARE WORKING , NO CODES IN COMPUTER ,

Before going to the extreme of new computer i would check the crank angle sensor.With older cars there was a ignition distributor a mechanical part that physically triggered each spark plug when it needed to fire.That has been phased out so the crank angle sensors job is to inform the ecu of the rotational position of the engine to trigger the spark plug coils and injectors. It usually reads of the flywheel or the crank pulley

You will need to replace the crank angle/position sensor near the crank pulley. A photo of the sensor is attached. The sensors wear out due to heat and cold cycles and internal corrosion.

MasterPro Ignition - Crankshaft Position Sensor Oreilly's Auto Parts part number is:
Line: MPI ' Part # 2-96054

injector pulse from ECU

the ECU will have fault codes stored internally to find the cause

would check other sensors first
crank angle sensor or cam angle sensor could stop the pulse
immobilizer

if the engine cranks over and has spark
ignition would be the last thing i would checkout

the signal from the crank angle sensor thats mounted against the block pointing to the crank pulley is what tells the ecu that the engine is turning and to provide spark and injector pulse
so your possible problem area is the ecu
also check the ecu harness plug wires and pins
make sure the crank angle sensor is plugged in

Yes cam sensor can have that effect. The management system needs to know which stroke the timing cylinder is on - the crank sensor supplies information about crank angle and the cam sensor tells it which stroke it is on.

crank angle sensor, Crank position sensor ,reads the position in degrees of the crankshaft. When the sensor reads a set point on the crankshaft it sends a signal to the ECM(CPU) program which then triggers the spark for that positioned cylinder. It also triggers the injector to squirt. Without it the CPU will not know when to set the spark or injector so nothing works.It is constant for all ECM controlled engines regardless. Further the cam shaft position sensor sends a signal to the cpu telling it that the valves are in the correct position for spark,fuel. When the cam belt/chain breaks there is no position regestired so the spark and fuel are shut off

have you checked the cam shaft sensor as it will also stop the injectors in the ECM

try the cam sensor too

check for spark while cranking you might have a bad crankshaft position sensor that would shut off the spark and injectors

it would be the crank angle sensor which tells the computer if the engine is turning and at what speed and when to spark