Honda BF115A, BF130A Outboard Motors Shop Manual., Page 115Get this manual
HONDA BFI 15A-130A
From P5-28
1) Turn the ignition switch OFF21 Connect the test harness to the ECM and the connectorNote that the test harness sensor connector must be disconnected this time3) Turn the ignition switch ON4) Measure the voltage between the test box's positive (+) A24 terminal and the negative (-1 A33 terminal