Yamaha Grizzly550 User Manual page 408

EPS (ELECTRIC POWER STEERING) SYSTEM (for
Fault code No. 21
Order Item/components and probable
cause
1 Connections
• Speed sensor coupler
• EPS control unit coupler at the wire
harness
2 Open or short circuit in wire harness. • Repair or replace if there is an
3 Defective speed sensor.
Fault code No. 22
Order Item/components and probable
cause
1 Connections
• EPS control unit coupler at the wire
harness
• ECU coupler at the wire harness
2 Open or short circuit in wire harness. • Repair or replace if there is an
3 Malfunction in ECU.
Symptom Speed sensor: open or short circuit detected.
Check or maintenance job
• Check the coupler for any pins
• Check the locking condition of
• If there is a malfunction, repair it
• Between speed sensor coupler
• Execute the diagnostic mode.
• Replace if defective.
Symptom No normal signals are received from the ECU.
Check or maintenance job
• Check the coupler for any pins
• Check the locking condition of
• If there is a malfunction, repair it
• Between ECU coupler and EPS
Replace the ECU.
9-71
YFM5FGP/YFM7FGP)
that may have pulled out.
the coupler.
and connect the coupler se-
curely.
open or short circuit.
and EPS control unit coupler.
(white–white)
(Code No. 21)
Refer to "CHECKING THE
SPEED SENSOR" on page
9-94.
that may have pulled out.
the coupler.
and connect the coupler se-
curely.
open or short circuit.
control unit coupler.
(orange/white–orange/white)
Reinstatement
method
Starting the en-
gine and acti-
vating the
vehicle speed
sensor by oper-
ating the vehi-
cle above 5
km/h (3 mi/h),
or setting the
main switch to
"OFF", then to
"ON", and then
deleting the
fault codes. Re-
fer to "DIAG-
NOSTIC
MODE" on
page 9-66.
Reinstatement
method
Setting the
main switch to
"OFF".