Electrical System - Yamaha YZ 2020 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
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
FUEL INJECTION SYSTEM ...........................................................................8-17
CIRCUIT DIAGRAM .................................................................................8-17
ECU SELF-DIAGNOSTIC FUNCTION .....................................................8-19
TROUBLESHOOTING METHOD .............................................................8-20
YAMAHA DIAGNOSTIC TOOL ................................................................8-21
CONNECTING THE YAMAHA DIAGNOSTIC TOOL ...............................8-21
TROUBLESHOOTING DETAILS (FAULT CODE)....................................8-22
FUEL PUMP SYSTEM....................................................................................8-41
CIRCUIT DIAGRAM .................................................................................8-41
TROUBLESHOOTING..............................................................................8-43
ELECTRICAL COMPONENTS.......................................................................8-44
CHECKING THE SWITCHES...................................................................8-45
CHECKING THE BULBS AND BULB SOCKETS.....................................8-47
CHECKING THE FUSES..........................................................................8-47
CHECKING AND CHARGING THE BATTERY ........................................8-48
CHECKING THE RELAYS .......................................................................8-50
CHECKING THE RELAY UNIT (DIODE)..................................................8-50
CHECKING THE IGNITION SPARK GAP ................................................8-51
CHECKING THE SPARK PLUG CAP ......................................................8-51
CHECKING THE IGNITION COIL ............................................................8-52
CHECKING THE CRANKSHAFT POSITION SENSOR ...........................8-52
CHECKING THE LEAN ANGLE SENSOR ...............................................8-53
CHECKING THE STARTER MOTOR OPERATION ................................8-53
CHECKING THE STATOR COIL..............................................................8-53
CHECKING THE RECTIFIER/REGULATOR ...........................................8-53
CHECKING THE FUEL SENDER ............................................................8-54
CHECKING THE RESISTOR ...................................................................8-54
CHECKING THE COOLANT TEMPERATURE SENSOR ........................8-55
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