2009 Yamaha F40 Outboard Service Manual, Page 110Get this manual
Electrical system 8Connect the main relay coupler and the engine ECM couplers and b
Engine ECM input voltage: Terminal 45Ground 12.0 (battery voltage) 4Turn the engine start switch to "ON," and then measure the input voltage between the engine ECM coupler terminal 36 and the ground
Checking the throttle body
The TPS, the air pressure sensor, the air temperature sensor, and the ISC are the components of the throttle body1Disconnect the throttle body coupler a2Turn the starter switch to "ON," and then measure the throttle body input voltage36