Yamaha YZ 2018 Series Owner's Service Manual page 317

3. Check the resistor.
Refer to "CHECKING THE RESIST-
ER" on page 8-70.
OK 
4. Check the entire signaling system's
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-15.
OK 
Replace the ECU.
SIGNALING SYSTEM
NG 
Replace the resistor.
NG 
Properly connect or repair the signaling
system's wiring.
8-18