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Wiring is always the first check I would do to make sure there is no rubbing, chafing, bad power to the PCM, etc. IF the PCM isn;t getting good power or ground, the PCM will not power up and you will have all the symptoms you have. The dealer should have a test out box to be able to test the PCM power and grounds. Have them check that first.
Then if the power is good, they can test on the PCM to see that it is getting the ignition in feed. If it is getting the ignition in and not sending signal out to the glow plug module or buzzing the injectors, then you will know the PCM is bad. If the dealer didn't do these steps, they are skipping and it can cost you more money and time in the long run. Reason, what if you wait the 2 weeks to get the PCM back, then the vehicle still has the same problem? You just paid for the PCM and you were without your vehicle for 2 weeks, AND now you have more getting tacked onto the bill because there was a wire harness issue.
I would ask them to make sure the wires for the power, grounds, ignition feed in, and glow plug out all ohm test good and that there are no issues there before ordering the PCM.
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