Yamaha PZ50W Service Manual page 328

KNOCK CONTROL SYSTEM INDICATOR LIGHT DO NOT COME ON.
Check the main fuse and ignition fuse.
Refer to "FUSE INSPECTION" in CHAPTER 2.
FAULTY
OK
Check the battery.
Refer to "BATTERY INSPECTION" in CHAPTER 2.
OUT OF SPECIFICATION
OK
Check the stator coil.
Refer to "CHARGING SYSTEM".
OUT OF SPECIFICATION
OK
Check the engine stop switch and main switch.
Refer to "IGNITION SYSTEM".
FAULTY
OK
Is self-diagnosis code 65 displayed?
YES
NO
Check the signal system's wiring.
Refer to "CIRCUIT DIAGRAM".
FAULTY
OK
Correct the connection and/or replace the
speedometer unit, rectifier/regulator, and/or ECU.
SIGNAL SYSTEM
Replace the main fuse and/or ignition fuse.
Replace and/or charge the battery.
Refer to "BATTERY INSPECTION" in CHAPTER
2.
Replace the stator coil assembly.
Replace the right handlebar switch and/or main
switch.
Check the knock sensor.
Properly connect or repair the signal system's wir-
ing.
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ELEC