Yamaha MT-01 T 2005 Service Manual page 359

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
(potentiometer 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
Symptom EXUP servo motor is stuck.
53 EXUP servo motor
FUEL INJECTION SYSTEM
Check or maintenance job
• Check the coupler for any pins
that may be 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 servo motor coupler
and ECU coupler
(blue–blue)
(white/red–white/red)
(black/blue–black/blue)
• Execute the diagnostic mode.
(Code No.53)
• Replace if defective.
Refer to "CHECKING THE
EXUP SERVO MOTOR" on
page 7-105.
Check or maintenance job
• Check the coupler for any pins
that may be 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 the EXUP servo motor
coupler and the ECU coupler.
(black/green–black/green)
(black/red–black/red)
• Execute the diagnostic mode.
(Code No.53)
• Replace if defective.
Refer to "CHECKING THE
EXUP SERVO MOTOR" on
page 7-105.
Replace if defective.
7-44
Reinstatement
method
Turning the
main switch to
"ON".
Reinstatement
method
Turning the
main switch to
"ON".
It takes 120
seconds at the
maximum
before the
original state
returns.