Technical Tips; Engine Control - Yamaha WaveRunner FX140 Service Manual

ENGINE CONTROL

The engine control module (ECM) controls ignition timing and fuel injection with information
received from six sensors and four switches installed on the engine and on the basis of the 3D map
saved in the ECM.
The sensors installed on the engine include the cam position sensor, temperature sensor, pulser
coil, throttle position sensor, intake air temperature sensor, and intake air pressure sensor.
The control switches include the slant detection switch, thermoswitch (engine), thermoswitch
(exhaust), and engine stop switch.
Pulser coil
Throttle position
sensor
Intake air temperature
sensor
Intake air pressure
sensor
Cam position sensor
Engine temperature
sensor
Stop switch
Oil pressure switch
Thermoswitch
(engine)
Thermoswitch
(exhaust)
Slant detection switch

TECHNICAL TIPS

ECM
(Electronic
control
module)
Fig. 19
18
Injectors
Ignition coils
Diagnostic system
Personal computer
Meter
Fuel pump relay
Main relay