2009 Yamaha F40 Outboard Service Manual, Page 113Get this manual

Engine control units and componentsFuel control units and components

Fuel control units and components
Checking the water detection switch
1Disconnect the water detection switch coupler a2Turn the engine start switch to "ON," and then measure the input voltage at the water detection switch coupler

Switch position UP Free DN

Terminal c

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives