Yamaha WaveRunner VXR VX1800A, Service Manual

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Technical tips
1-21
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.
Part name Function
1 TPS Detects the opening angle of the ETV.
2 Cam position sensor Detects the rotational position of the camshaft.
3 Slant detection switch Detects whether the watercraft is capsized.
4 ECM
Properly controls ignition timing, fuel injection timing and vol-
ume, opening angle of the ETV, and fail-safe function with in-
formation received from the sensors and switches.
5 Thermo sensor Detects the temperature of the exhaust cooling water.
6 Oil pressure switch Detects the pressure of the engine oil.
7 Thermo switch Detects engine overheating.
8
Intake air temperature sen-
sor
Detects the temperature of the intake air.
9 Intake air pressure sensor Detects the pressure of the intake air.
10 Engine temperature sensor Detects the temperature of the cylinder block.
11 Pickup coil Detects the crankshaft angle.
12 RPS Detects the opening angle of the RiDE lever.
11
7
8
2
5
10
9
6
1
3
4
14
12
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