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Actually, I think you are RIGHT.
I replaced the unit mostly because the owner brought me the diagnosis from another shop and he simply asked me to replace it, which I did.
I noticed the plug-to-unit retaining clips were broken (someone broke them removing the plug at some point), but since it was retained well by friction, I didn't think much of it.
Later, when the owner called me irate that his car was acting up, and demanded I drop everything and rescue him (which I did), and wiggling the plug changed the codes I was pulling with my code scanner I'd brought w/ me, I got suspicious of the connection.
I got the car running well enough that the next day he dropped the car off and I re-made ALL of the under-hood grounds, and tried to slightly crimp the ETC/ETA connectors and spray them with contact cleaner, and then I used a tie-wrap to pull the plug and socket firmly together.
It's been a month and I haven't heard from him, so I suspect that fixed it. Sadly, I lost a friend because I think he feels I should have "known" and not just done what he told me to do based on the written diagnosis from an independent Volvo shop he handed me.
In the process, I learned that the newer S60/80 don't use ETMs like my '01 S60 T5, but simply use signals from the ECU to drive the throttle body motor, and are pretty bulletproof except for the fact the ETCs use more current for the motor and the connections must be resistance-free.
I may try to re-sell the removed ECT/ETA with a money-back guarantee (after cleaning the throttle body throat well) to repay me for the frustration of tracking down the problem, with a warning to the buyer to clean the connections well and to make sure the connectors are firmly seated!
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