Yamaha YFM7FGPW Service Manual page 473

EPS (ELECTRIC POWER STEERING) SYSTEM
Fault code No. 54
Order Item/components and probable
cause
1 Malfunction in EPS control unit.
Fault code No. 55
Order Item/components and probable
cause
1 Faulty battery.
2 Malfunction in rectifier/regulator.
3 Malfunction in EPS control unit.
Symptom Relay contacts in the EPS control unit are welded
together.
Check or maintenance job
Replace the EPS control unit.
Symptom Power supply to the EPS control unit is not normal (High
battery voltage).
Malfunction in control unit.
Check or maintenance job
Replace the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" in
chapter 3.
Replace if defective.
Refer to "CHARGING SYSTEM".
Replace the EPS control unit.
9 - 68
– +
ELEC
Reinstatement
method
Turning the
main switch to
"OFF".
Reinstatement
method
Turning the
main switch to
"OFF".