Technical Tips; Engine Control - Yamaha GX1800A Service Manual

Technical tips

Engine control

The ECM controls ignition timing and fuel injection with information received from the sensors and
switches installed on the engine as well as utilizing the base map saved in the ECM.
13
Part name
1 Cam position sensor
2 Slant detection switch
3 ECM
4 Thermo sensor
5 Oil pressure switch
6 Thermo switch
Intake air temperature sen-
7
sor
8 Knock sensor
9 TPS
10 Intake air pressure sensor
11 Engine temperature sensor
12 Pickup coil
1
5
15
14
Detects the rotational position of the camshaft.
Detects whether the watercraft is capsized.
Properly controls ignition timing, fuel injection timing and vol-
ume, opening angle of the ETV, and fail-safe function with
information received from the sensors and switches.
Detects the temperature of the exhaust cooling water.
Detects the pressure of the engine oil.
Detects engine overheating.
Detects the temperature of the intake air.
Detects engine knocking.
Detects the opening angle of the ETV.
Detects the pressure of the intake air.
Detects the temperature of the cylinder block.
Detects the crankshaft angle.
2
3
4
12
Function
4
Technical tips
6
9
10
11
7
8