My 2005 Nissian Senta cranks but won't start and nothing shows up on diagnostic scrambler

Connect it to a code reader scan tool. The engine light codes will tell you some of the reason, but Jeff's answer is far better than mine regarding how all this stuff works..

Check cylinder compressions, injectors spray patterns, timing ,as new timing chain fitted

Cranks but won.t run, Check the attached links,instruction and guides, Good luck
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Engine cranks but won start Troubleshooting tips

Diagnostic flowchart for car that won start or stalls Troubleshooting for...

Troubleshooting and Fixing Car that Won Start

No Start Diagnostic Basics EricTheCarGuy

what model is your car?

Unfortunately, replacing a sensor only fixes the problem about half the time. The code means the computer is not getting a signal from the sensor, not that the sensor has failed.
The problem could be in the wiring, or the part that the sensor gets the signal from.

Free spinning or does it sound like its trying to start? If its free spinning, timing chain possible. If its trying to start, look into the ignition system including crank and cam sensors. You will need a scan tool that read live data. Codes on the PCM or no?

Having the vehicle checked for DTC'S - diagnostic trouble code's an doing diagnostic's for the code is the proper way to diagnose , not guessing . No you cant reset it or disengage it ,need factory or professional scanner .

first thing to do is get the car not to crank and check for power to the starter. if the starter has battery power and signal from the ignition switch then the problem is the starter. second thing is to check the plug at the trans range switch. the connector may be loose since you just had the trans repaired. ground may be an issue but not likely since the dash lights and other things work. GOOD LUCK.

Define - It attempts to turn over but won't catch and run ???? When you turn the key to start does the starter engage an spin the engine ? This would be a crank no start condition . If the starter doesn't engage an spin the engine this would be a no crank no start condition . Sorry to ask but i have only been an auto tech for thirty years an have heard a lot of different discriptions for these simple actions . crank no start or no crank no start . Very different diagnostic procedures . So when you turn the key to start , does the starter engage an spin the engine ,but won't start an run ?

crank position sensor