Okay. First of all, this is a circuit issue so just make sure you test the circuit from the ECM to the solenoid for an open.
Here is the procedure for the timing chain, tensioner, front cover, and cylinder head/gasket. Some is overlap but it is all there. Unfortunately, MB is not well known for there detail in removing and installing. So some of these things are not step by step.
Images (Click to enlarge)
Tuesday, July 23rd, 2019 AT 6:31 PM