W205 C300 Cranks But No Start

[ynvmybenz]

I replaced the engine on a 2015 C300 and the car cranks but won't start. I removed the coil and it shows a spark. I can only check with an Autel scanner but there are no error codes. I may have to check the crank signal and cam sensors. Has anyone else experienced this?

 

[samjack]

It appears that the problem may be with the crankshaft or camshaft position sensors, as they are critical to starting the engine. Check both sensors and their connections to ensure they are working correctly. You can check the resistances with a multimeter to make sure they are OK and also check their output voltage while cranking the engine.

 

[Mersovod]

If there is a spark, then there are impulses from the crankshaft sensor. Have you checked the fuel supply? There may also be no power to the engine control unit (terminal 87). Check the presence of power (30, 87) at all inputs of the control unit according to the electrical diagram.

 

[Filipov1912]

The problem may also be related to the fuel injector nozzle and fuel pump.