Yamaha YZ450FX 2021 Owner's Service Manual page 301

FUEL INJECTION SYSTEM
1. Crankshaft position sensor
2. AC magneto
3. Rectifier/regulator
4. Joint connector
5. Main relay
6. Engine ground
7. Battery
8. Frame ground
9. Main fuse
10.Starter relay
14.CCU (Communication Control Unit)
15.Warning light
17.Engine trouble warning light
19.Yamaha diagnostic tool coupler
20.ECU (Engine Control Unit)
21.Ignition coil
22.Spark plug
23.Fuel injector
25.Fuel pump
26.Radiator fan motor fuse
27.Radiator fan motor lead coupler (OPTION)
28.Radiator fan motor relay
29.Intake air temperature sensor
30.Coolant temperature sensor
31.Throttle position sensor
32.Intake air pressure sensor
33.Engine stop switch
34.Gear position switch
A. Battery sub-lead
B. Wire harness
C. Ignition coil sub-lead
D. CCU sub-lead
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