Try measuring the voltage across the two terminals of the EHA harness connector. I'm not sure what they should be, but there should be something.

Of course my first thought when there is no current is the OVP but of course that means MAS on a 91.

Also check your VOMs internal fuse and try measuring something else like the current to the idle valve which has similar connections. It should be much higher in the range of 600ma or more. Unfortunately if the KE controller is shut down the idle air valve will also have no current. and unfortunately both systems do rather well totally shut off.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician