Yamaha YZFR1W 2007 Service Manual page 367

Fault code No. 17
Diagnostic code No.
Orde Item/components and probable
r 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.
Orde Item/components and probable
r 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, and
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 EXUP servo motor
• 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 EXUP servo motor
• Execute the diagnostic mode.
• Replace if defective.
Replace if defective.
8-48
FUEL INJECTION SYSTEM
that may have pulled out.
the coupler.
and connect the coupler
securely.
open or short circuit.
coupler and ECU coupler.
(Blue–Blue)
(White/Red–White/Red)
(Black/Blue–Black/Blue)
(Code No.53)
that may be pulled out.
the couplers.
and connect the coupler
securely.
open or short circuit.
coupler and ECU coupler.
(Black/Green–Black/Green)
(Black/Red–Black/Red)
(Code No.53)
Reinstatement
method
Reinstated
automatically if
a normal signal
is received.
Reinstatement
method
Turning the
main switch to
"ON".
It takes 3 sec-
onds at the
maximum
before the origi-
nal state
returns.