2009 Yamaha F40 Outboard Service Manual, Page 45Get this manual
Engine control system
Failsafe
When the sensors malfunction, the trouble diagnosis control commands the engine ECM to enter failsafe modeThe trouble diagnosis control system records the trouble codes depending on the engine trouble conditionsTrouble code Item Water temp sensor (Thermo sensor) 15 CE LAN gauge display Trouble conditions to be detected Short or open in the thermo sensor circuitAt engine start: Sets to (41 F), 20 (68 F) or 40 (104 F) depending on the signals from the air temperature sensor (2)After engine start: maintained at 40C (104 F) (2)Short or open in the TPS circuitDetermines the fully closed position of the throttle based on the signals from the air pressure sensor (2)Remains below 12 for minutes when engine speed is above 2000 rminShort or open in the air temperature sensor circuitOperates at 40 (104 F) (2)Neutral switch is at "ON" and water detection switch is at "ON Cranks with the neutral switch "OFF Short or open in the air pressure sensor circuitSets tentative air pressure value based on the engine speed and TPS signals (2)Neutral switch is at "OFF," throttle is fully closed, ISC valve is fully closed, and engine speed is above 1100 rminCranks when the clip is not insertedCooling water temperature lower than 40 (104 F) and engine speed above 3000 rmin for more than minutes