Yamaha Apex RX10PA 2011 Supplementary Service Manual page 306

EPS (ELECTRIC POWER STEERING) SYSTEM
41, 42,
Fault code No. Symptom EPS motor: open or short circuit detected.
43, 45
Item/components and probable cause
Order
Connections
EPS motor coupler
1
Open or short circuit in EPS motor lead.
2
Defective EPS motor.
3
Fault code No. 52 Symptom Relay contacts in the EPS control unit are welded together.
Item/components and probable cause
Order
Malfunction in EPS control unit.
1
Fault code No. 53 Symptom Power supply to the EPS control unit is not normal (low battery voltage).
Item/components and probable cause
Order
Faulty battery.
1
Malfunction in rectifier/regulator or charging system.
2
Malfunction in EPS control unit.
3
Fault code No. 54 Symptom Relay contacts in the EPS control unit are shorted or open.
Item/components and probable cause
Order
Malfunction in EPS control unit.
1
Check or maintenance
job
Check the coupler for
any pins that may have
pulled out.
Check the locking condi-
tion of the coupler.
If there is a malfunction,
repair it and connect the
coupler securely.
Repair or replace if there
is an open or short cir-
cuit.
Between EPS motor and
EPS control unit coupler.
(Red – Red)
(Black – Black)
Replace if defective.
Refer to "CHECKING
THE EPS MOTOR".
Check or maintenance
job
Replace the EPS control
unit.
Check or maintenance
job
Replace or charge the
battery.
Refer to "CHECKING
AND CHARGING THE
BATTERY" in chapter 3.
Replace if defective.
Refer to "CHARGING
SYSTEM".
Replace the EPS control
unit.
Check or maintenance
job
Replace the EPS control
unit.
128
ELEC
Reinstatement method
Turning the main switch
to "OFF".
Reinstatement method
Turning the main switch
to "OFF".
Reinstatement method
Turning the main switch
to "OFF".
Reinstatement method
Turning the main switch
to "OFF".