Electrical System - Yamaha YZ450FX 2019 Owner's Service Manual

ELECTRICAL SYSTEM

IGNITION SYSTEM...........................................................................................8-1
CIRCUIT DIAGRAM ...................................................................................8-1
TROUBLESHOOTING................................................................................8-3
ELECTRIC STARTING SYSTEM......................................................................8-5
CIRCUIT DIAGRAM ...................................................................................8-5
TROUBLESHOOTING................................................................................8-7
CHARGING SYSTEM .......................................................................................8-9
CIRCUIT DIAGRAM ...................................................................................8-9
TROUBLESHOOTING..............................................................................8-11
SIGNALING SYSTEM.....................................................................................8-13
CIRCUIT DIAGRAM .................................................................................8-13
TROUBLESHOOTING..............................................................................8-15
COOLING SYSTEM (For JPN).......................................................................8-17
CIRCUIT DIAGRAM .................................................................................8-17
TROUBLESHOOTING..............................................................................8-19
FUEL INJECTION SYSTEM ...........................................................................8-21
CIRCUIT DIAGRAM .................................................................................8-21
ECU SELF-DIAGNOSTIC FUNCTION .....................................................8-23
TROUBLESHOOTING METHOD .............................................................8-24
YAMAHA DIAGNOSTIC TOOL ................................................................8-25
FEATURES OF THE YAMAHA DIAGNOSTIC TOOL ..............................8-26
FUNCTIONS OF THE YAMAHA DIAGNOSTIC TOOL ............................8-26
CONNECTING THE YAMAHA DIAGNOSTIC TOOL ...............................8-26
TROUBLESHOOTING DETAILS (FAULT CODE)....................................8-28
FUEL PUMP SYSTEM....................................................................................8-47
CIRCUIT DIAGRAM .................................................................................8-47
TROUBLESHOOTING..............................................................................8-49
ELECTRICAL COMPONENTS.......................................................................8-51
CHECKING THE SWITCHES...................................................................8-55
CHECKING THE BULBS AND BULB SOCKETS.....................................8-58
CHECKING THE FUSES..........................................................................8-58
CHECKING AND CHARGING THE BATTERY ........................................8-59
CHECKING THE RELAYS .......................................................................8-61
CHECKING THE DIODE ..........................................................................8-61
CHECKING THE IGNITION SPARK GAP ................................................8-62
CHECKING THE SPARK PLUG CAP ......................................................8-62
CHECKING THE IGNITION COIL ............................................................8-63
CHECKING THE CRANKSHAFT POSITION SENSOR ...........................8-63
CHECKING THE ECU ..............................................................................8-64
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