To try to identify the ECM I removed it from its container, photographed the labels and replaced it.
When I try to start the engine, I turn the ignition key to the first stop, all the dash warning lights illuminate as normal, the ABS/TRACS lights go out after they pass the initial test, again as usual. Then, as I turn the key further, nothing happens. There is no attempt to engage the starter. The battery is not flat. The trip computer still has all the data it had before the removal.
Now for the mea culpa: I didn't disconnect the battery during the removal/replacement.
Before I do anything else like disconnect the negative battery lead for 15 minutes, is there anything else I can try? Could I have damaged the ECM?
Any thoughts would be appreciated.
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