Yamaha F150A, Service Manual

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Electronic control system
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1. Engine ECM
Determines the engine operating conditions according to the
input signals from the sensors, and sends output signals to
operate the actuators to perform the various control functions.
2. Pulser coil
Detects the engine speed.
Detects the crankshaft angle.
3. Thermoswitch Detects engine overheating.
4. Ignition coil Activates the ignition.
5. Vapor shut-off valve
Controls the amount of vapor gas to be sent from the vapor
separator to the intake system.
6. Oil pressure sensor Detects the engine oil pressure.
7. Water detection switch Detects water intrusion in fuel filter.
8. Air temperature sensor Detects the intake air temperature.
9. Air pressure sensor Detects the intake air pressure.
10. ISC valve Adjusts the flow of air to the engine when idling.
11. Engine temperature sensor Detects the engine temperature.
12. TPS Detects the throttle valve opening.
13. Shift position switch Detects the neutral position.
14. Shift cut-off switch
Detects the shift-in or shift-out condition for the forward gear-
shift.
15. High-pressure fuel pump Pressurizes the fuel and sends the fuel to the fuel rail.
16. Fuel injector Injects fuel.
17. Engine shut-off switch Stops the engine forcibly.