Yamaha F150B Service Manual

Also see for F150B: Owner's manual Service manual Owner's manual

5-31ELEC Electrical system4. Remove the junction box cover, and thendisconnect the engine ECM coupler b..5. Check the wiring harness for continuity.6. Connect the engine ECM coupler b, andthen install junction box cover.7. Connect the pulser coil coupler a.Checking the air temperature sensor1. Measure the ambient temperature.2. Connect the YDIS to display “Intake tem-perature” (air temperature).3. Check that the difference between theambient temperature and the displayedintake temperature is within ± 5 °C(±9 °F).TIP:• Check the air temperature sensor when theengine is cold.• When checking the air temperature sensor,remove the top cowling and do not start theengine.4. Disconnect the air temperature sensorcoupler a.5. Turn the engine start switch to “ON,” andthen measure the input voltage at the airtemperature sensor coupler.6. Turn the engine start switch to “OFF,” andthen remove the air temperature sensor.7. Place the air temperature sensor in acontainer of water and slowly heat thewater.Wiring harness continuity:Terminal 1–Terminal 14Terminal 2–Terminal 8Terminal 3–Terminal 15b8ab1 321415Air temperature sensor input voltage:Black/Yellow (B/Y)–Black (B)4.75–5.25 VB B/Ya