Electrical System - Yamaha WR250FM 2021 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
STARTING CIRCUIT CUT-OFF SYSTEM OPERATION ...........................8-7
TROUBLESHOOTING................................................................................8-9
CHARGING SYSTEM .....................................................................................8-11
CIRCUIT DIAGRAM .................................................................................8-11
TROUBLESHOOTING..............................................................................8-13
SIGNALING SYSTEM.....................................................................................8-15
CIRCUIT DIAGRAM .................................................................................8-15
TROUBLESHOOTING..............................................................................8-17
LIGHTING SYSTEM .......................................................................................8-19
CIRCUIT DIAGRAM .................................................................................8-19
TROUBLESHOOTING..............................................................................8-21
COOLING SYSTEM........................................................................................8-23
CIRCUIT DIAGRAM .................................................................................8-23
TROUBLESHOOTING..............................................................................8-25
FUEL INJECTION SYSTEM ...........................................................................8-27
CIRCUIT DIAGRAM .................................................................................8-27
ECU SELF-DIAGNOSTIC FUNCTION .....................................................8-29
TROUBLESHOOTING METHOD .............................................................8-30
YAMAHA DIAGNOSTIC TOOL ................................................................8-31
CONNECTING THE YAMAHA DIAGNOSTIC TOOL ...............................8-31
TROUBLESHOOTING DETAILS (FAULT CODE)....................................8-33
FUEL PUMP SYSTEM....................................................................................8-53
CIRCUIT DIAGRAM .................................................................................8-53
TROUBLESHOOTING..............................................................................8-55
ELECTRICAL COMPONENTS.......................................................................8-56
CHECKING THE SWITCHES...................................................................8-57
CHECKING THE BULBS AND BULB SOCKETS.....................................8-59
CHECKING THE FUSES..........................................................................8-59
CHECKING AND CHARGING THE BATTERY ........................................8-60
CHECKING THE RELAYS .......................................................................8-62
CHECKING THE RELAY UNIT (DIODE)..................................................8-64
CHECKING THE IGNITION SPARK GAP ................................................8-65
CHECKING THE SPARK PLUG CAP ......................................................8-65
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