2009 Yamaha F40 Outboard Service Manual, Page 132Get this manual
Electrical system
Command Link Multifunction Meter sensor
Checking the water pressure sensor (option)
1Disconnect the water pressure sensor coupler a2Turn the engine start switch to "ON," and then measure the input voltage at the water pressure sensor coupler
9Install the magnet switch l, cap e, and the starter motor lead m10Tighten the starter motor lead screw to the specified torque
Water pressure sensor input voltage: Orange (O)Black (B) 4.755.25 V
3Remove the water pressure sensor, and then connect the pressure pump and the test harness (3 pins) b4Apply positive pressure to the water pressure sensor slowly, and then measure the output voltageStarter motor lead screw n: Nm (0.3 kgfm, 2.2 ftlb)