Yamaha XV19SX(C) Service Manual page 436

Fault code No. 17
Diagnostic code No.
Order Item/components and probable
cause
1 Connections
• EXUP servo motor coupler
• Main wire harness ECU coupler
2 Open or short circuit in wire harness.
3 Defective EXUP servo motor (potenti-
ometer circuit).
Fault code No. 18
Diagnostic code No.
Order Item/components and probable
cause
1 Connections
• EXUP servo motor coupler
• Main wire harness ECU coupler
2 Open or short circuit in wire harness.
3 Defective EXUP servo motor.
4 Defective EXUP valve, pulley, cables.
Symptom EXUP servo motor circuit: open or short circuit detected.
53 EXUP servo motor
Check or maintenance job
• Check the coupler for any pins
• Check the locking condition of
• If there is a malfunction, repair it
• Repair or replace if there is an
• Between servo motor coupler
• Execute the diagnostic mode.
• Replace if defective.
Symptom EXUP servo motor is stuck.
53 EXUP servo motor
Check or maintenance job
• Check the coupler for any pins
• Check the locking condition of
• If there is a malfunction, repair it
• Repair or replace if there is an
• Between the EXUP servo motor
• Execute the diagnostic mode.
• Replace if defective.
Replace if defective.
7-45
FUEL INJECTION SYSTEM
that may be pulled out.
the coupler.
and connect the coupler se-
curely.
open or short circuit.
and ECU coupler
(blue–blue)
(white/red–white/red)
(black/blue–black/blue)
(Code No.53)
Refer to "CHECKING THE
EXUP SERVO MOTOR" on
page 7-90.
that may be pulled out.
the coupler.
and connect the coupler se-
curely.
open or short circuit.
coupler and the ECU coupler.
(black/green–black/green)
(black/red–black/red)
(Code No.53)
Refer to "CHECKING THE
EXUP SERVO MOTOR" on
page 7-90.
Reinstatement
method
Turning the
main switch to
"ON".
Reinstatement
method
Turning the
main switch to
"ON".
It takes 120
seconds at the
maximum be-
fore the origi-
nal state
returns.