Yamaha YFM7FGPW Service Manual page 472

EPS (ELECTRIC POWER STEERING) SYSTEM
Fault code 41, 42,
No. 43, 45
Order Item/components and probable
cause
1 Connections
• EPS motor coupler
2 Open or short circuit in EPS motor
lead.
3 Defective EPS motor.
Fault code No. 52
Order Item/components and probable
cause
1 Malfunction in EPS control unit.
Fault code No. 53
Order Item/components and probable
cause
1 Faulty battery.
2 Malfunction in rectifier/regulator or
charging system.
3 Malfunction in EPS control unit.
Symptom EPS motor: open or short circuit detected.
Check or maintenance job
• Check the coupler for any pins
that may have pulled out.
• Check the locking condition 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 circuit.
• Between EPS motor and EPS
control unit coupler.
(red–red)
(black–black)
Replace if defective.
Refer to "CHECKING THE EPS
MOTOR".
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 (low
battery voltage).
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.
9 - 67
– +
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".