I noticed that you have replaced the EHA, have you tested if the current is flowing thru it ? When the switch is set to run (right before start), 10 - 20 ma current should flow thru the EHA. The current will drop at idle. But if you blip the gas pedal, you should get currents larger than 15ma for each blip. Do this test when the engine is cold. Also, the current measurements must be made via a series circuit with the EHA (not parallel like voltage measurements).

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Saumil S. Patel