Electrical System - Yamaha YZ 2019 Series 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
FUEL INJECTION SYSTEM ...........................................................................8-19
CIRCUIT DIAGRAM .................................................................................8-19
ECU SELF-DIAGNOSTIC FUNCTION .....................................................8-21
TROUBLESHOOTING METHOD .............................................................8-22
YAMAHA DIAGNOSTIC TOOL ................................................................8-23
FEATURES OF THE YAMAHA DIAGNOSTIC TOOL ..............................8-23
FUNCTIONS OF THE YAMAHA DIAGNOSTIC TOOL ............................8-23
CONNECTING THE YAMAHA DIAGNOSTIC TOOL ...............................8-23
TROUBLESHOOTING DETAILS..............................................................8-25
FUEL PUMP SYSTEM....................................................................................8-45
CIRCUIT DIAGRAM .................................................................................8-45
TROUBLESHOOTING..............................................................................8-47
ELECTRICAL COMPONENTS.......................................................................8-49
CHECKING THE SWITCHES...................................................................8-53
CHECKING THE BULBS AND BULB SOCKETS.....................................8-56
CHECKING THE FUSES..........................................................................8-56
CHECKING AND CHARGING THE BATTERY ........................................8-57
CHECKING THE RELAYS .......................................................................8-60
CHECKING THE DIODE ..........................................................................8-61
CHECKING THE IGNITION SPARK GAP ................................................8-61
CHECKING THE SPARK PLUG CAP ......................................................8-62
CHECKING THE IGNITION COIL ............................................................8-62
CHECKING THE CRANKSHAFT POSITION SENSOR ...........................8-63
CHECKING THE LEAN ANGLE SENSOR ...............................................8-63
CHECKING THE STARTER MOTOR OPERATION ................................8-64
CHECKING THE STATOR COIL..............................................................8-64
CHECKING THE RECTIFIER/REGULATOR ...........................................8-64
CHECKING THE FUEL SENDER ............................................................8-65
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