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> I would, however, like to confirm that the idle system is working as
> intended.

No hum, no idle control.  It hums because it's driven by a 12V ~250 Hz PWM
signal from the ICU.

The relay you refer to is the ECU relay that powers the ECU.  It's
controlled by ign sw power to the coil (except in early '86).  ECU in turn
controls the fuel pump relay.  Depending on year, the ICU uses ECU power or
fuel pump power.

Yrs,
d

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