Electrical System - Yamaha MT-09 2021 Service Manual

ELECTRICAL SYSTEM

IGNITION SYSTEM ......................................................................................... 8-1
CIRCUIT DIAGRAM .................................................................................. 8-1
ENGINE STOPPING DUE TO SIDESTAND OPERATION.......................8-5
TROUBLESHOOTING ..............................................................................8-6
ELECTRIC STARTING SYSTEM .................................................................... 8-9
CIRCUIT DIAGRAM .................................................................................. 8-9
STARTING CIRCUIT CUT-OFF SYSTEM OPERATION ........................ 8-13
TROUBLESHOOTING ............................................................................8-15
CHARGING SYSTEM....................................................................................8-17
CIRCUIT DIAGRAM ................................................................................ 8-17
TROUBLESHOOTING ............................................................................8-21
LIGHTING SYSTEM ......................................................................................8-23
CIRCUIT DIAGRAM ................................................................................ 8-23
TROUBLESHOOTING ............................................................................8-27
SIGNALING SYSTEM ...................................................................................8-29
CIRCUIT DIAGRAM ................................................................................ 8-29
TROUBLESHOOTING ............................................................................8-33
COOLING SYSTEM....................................................................................... 8-39
CIRCUIT DIAGRAM ................................................................................ 8-39
TROUBLESHOOTING ............................................................................8-43
FUEL PUMP SYSTEM...................................................................................8-45
CIRCUIT DIAGRAM ................................................................................ 8-45
TROUBLESHOOTING ............................................................................8-49
ELECTRICAL COMPONENTS...................................................................... 8-51
CHECKING THE SWITCHES .................................................................8-53
CHECKING THE FUSES ........................................................................8-55
REPLACING THE ECU (Engine Control Unit) ........................................ 8-56
CHECKING AND CHARGING THE BATTERY....................................... 8-56
CHECKING THE RELAYS ...................................................................... 8-56
CHECKING THE RELAY UNIT (DIODE) ................................................ 8-58
CHECKING THE IGNITION COILS......................................................... 8-59
CHECKING THE IGNITION SPARK GAP............................................... 8-59
CHECKING THE CRANKSHAFT POSITION SENSOR.......................... 8-60
CHECKING THE STARTER MOTOR OPERATION ...............................8-60
CHECKING THE STATOR COIL ............................................................ 8-61
CHECKING THE RECTIFIER/REGULATOR ..........................................8-61
8