Acura NSX 1991 Manual page 702

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Aspirator Fan
Test
Connect battery power to the No. 3 terminal of the
aspirator fan, and connect ground to the No. 4 terminal.
The aspirator fan should run.
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Relay
Test
There should be continuity between the C and D
terminals.
There should be continuity between the A and B ter-
minals when power and ground are connected to the C
and D terminals.
There should be no continuity when power is
disconnected.