And what is the EHA amperage doing (mA)?

Lambda (Duty Cycle %)?

[With oxygen sensor connected / disconnected?] *

Is that a heated Oxygen Sensor with separate wires for the heated portion?

* The car should still run with the oxygen sensor disconnected. Or with other CIS-E sensors not functioning/wires shorted/disconnected - Called "Limp Home Mode". The computer replaces the "improbable value" with a midline value which should allow the vehicle to still operate. More and more of these features were added to later model cars. I don't know which years had which limp home features? (Or if earlier years had no such features on the CIS-E computer or not?)