Mercury 25 EFI Service Manual page 238

Service Procedures
4. If the vacuum pressure is not released when 12 volts is applied to IAC terminals, replace the IAC.
5. Measure the resistance of the IAC with the DMT 2004 Digital Multimeter tool. The IAC is not polarity sensitive.
NOTE: The IAC resistance values are for reference only.
Red
Right terminal pin
6. Connect the DMT 2004 Digital Multimeter tool to the terminal pins of the IAC.
DMT 2004 Digital Multimeter
Page 3C-54
a
Meter Test Leads
Black
Left terminal pin
© 2016 Mercury Marine
a - 12 volts positive
b - 12 volts negative
b
22595
Meter Scale
Auto
23017
91‑892647A01
90-8M0105568 eng MARCH 2016
Reading (O)
24.0 ‑ 30.0