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The air flow sensor needs to have the correct power going to it - the power supplied is measured between the top and the bottom pins. This should be available with the ignition switched on and the engine stopped.
(I'm not quoting voltages because they can be different - check in the FSM)
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I had a similarly frustrating time with my W201 a trick (that is tedious and laborious) is to go through the specifications from the FSM and measure each sensor and actuator but to also do this at the plug for the ECU
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As for the "I might have damaged it when I jump started it" - these systems are good quality - they might seem otherwise because they are frustrating little bastards (!) - but it is probably best to remove that thought from your head. Banish the "what if" and replace it with "well that's measured and OK".
Facts help with CIS trauma!
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