Exup Servo Motor: Stuck Exup Servo Motor Is Detected - Yamaha R1 Series 2015 Service Manual

Fault code No.
Item
2 Connection of wire harness
ECU coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
3 Wire harness continuity.
4 Defective EXUP servo motor.
5 Malfunction in ECU.
TIP
If fault code numbers "17" and "18" are both indicated, take the actions specified for fault code number
"17" first.
Fault code No. 18
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Actuation
Procedure
Item Probable cause of
malfunction and check
17
EXUP servo motor: open or short circuit detected.
Improperly connected
nect the coupler securely or
replace the wire harness.
Open or short circuit
the wire harness.
Between EXUP servo motor
coupler and ECU coupler.
blue–blue
white/yellow–white/yellow
Between EXUP servo motor
coupler and joint connector.
black/blue–black/blue
Between joint connector and
ECU coupler.
black/blue–black/blue
Execute the diagnostic mode.
(Code No. 53)
Check the operating sound of
the motor.
Replace if defective.
Replace the ECU.
Refer to "REPLACING THE
ECU (Engine Control Unit)" on
page 8-180.
18

EXUP servo motor: stuck EXUP servo motor is detected.

Able to start engine
Able to drive vehicle
53
After the EXUP is fully closed, it stops at the opening base position (inter-
mediate position).
This operation takes approximately 3 seconds during which time the
warning light comes on.
Check the operating sound.
Maintenance job
8-62
FUEL INJECTION SYSTEM
Con- Turn the main switch to "ON".
Fault code number is not dis-
played Service is finished.
Fault code number is displayed
Go to item 3.
Replace Turn the main switch to "ON".
Fault code number is not dis-
played Service is finished.
Fault code number is displayed
Go to item 4.
Turn the main switch to "ON".
Fault code number is not dis-
played Service is finished.
Fault code number is displayed
Go to item 5.
Confirmation of service com-
pletion