EHA is the electronic mechainsm to fuel correction.

Fuel correction for cold running, starting enrichment, acceleration enrichment, decel cut-off, and others are effected by EHA. In countries with catalytic convertors feedback control is also effected.

Code enabling criteria is what you are looking for and I don't know what the controller cares about actual EHA current.

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