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My name is ***** ***** I am a Volvo dealer technician. What are the code numbers you are getting?
Was any work done to the car before this no-start condition?
They just did the belt? The cam locks are not needed for doing the belt. Unless they did more (like the VVT or cam seals)
Have you removed the covers on the backs of the cams to check to see if the reluctor wheels are attached to the cams?
If timing is good and you are sure he checked the reluctors to make sure they didn't come off, then the problem is either the sensors or the circuit for them. He will have to remove the ECM and disconnect the sensors to ohm the wiring.
I'll get the pin numbers if you'd like
What wires did you ohm?
What pin numbers?
and they had no resistance? Is there 5V to the sensors when the ECM is plugged in? and is there ground to the sensors when the ECM is plugged in?
Okay, then the ECM is sending the proper signal and ground to the sensors and the wiring (specifically the signal wires) checks good according to what you're telling me. The problem is either the sensors themselves or the reluctors coming loose. I doubt both sensors failed, but I can only go by what you tell me.
Why did you put a CEM in it? Did you program the new ECM?
Are there any other codes?
I'm going to have to opt out of this one. It will be back on the list for other experts to look at and if they have any ideas, they will be along. Something is being missed here and I don't feel I can help over the internet.