Yamaha YZFR1W 2007 Service Manual page 377

Fault code No. 42
Diagnostic code No.
Orde Item/components and probable
r cause
A-1 Installed state of speed sensor.
A-2 Connections
• Speed sensor coupler
• Main wire harness ECU coupler
A-3 Open or short circuit in lead.
A-4 Defective speed sensor.
B-1 Installed state of neutral switch.
B-2 Connections
• Neutral switch coupler
• Main wire harness ECU coupler
B-3 Open circuit in neutral switch lead.
B-4 Defective neutral switch.
B-5 Faulty shift drum (neutral detection
area).
ANo normal signals are received from the speed sensor.
Symptom
BOpen circuit is detected in the neutral switch.
A 07 Speed sensor
B 21 Neutral switch
Check or maintenance job
Check for looseness or pinching. Starting the
• Check the couplers for any pins
• Check the locking condition of
• If there is a malfunction, repair it
• Repair or replace if there is an
• Between speed sensor coupler
• Execute the diagnostic mode.
• Replace if defective.
Check for looseness or pinching.
• Check the couplers for any pins
• Check the locking condition of
• If there is a malfunction, repair it
• Repair or replace if there is an
• Between neutral switch coupler
• Between relay unit coupler and
• Execute the diagnostic mode.
• Replace if defective.
• Replace if defective.
8-58
FUEL INJECTION SYSTEM
that may be pulled out.
the couplers.
and connect the coupler
securely.
open or short circuit.
and ECU coupler.
(Blue–Blue)
(White/Yellow–White/Yellow)
(Black/Blue–Black/Blue)
(Code No. 07)
Refer to "CHECKING THE
SPEED SENSOR" on page 8-
95.
that may be pulled out.
the couplers.
and connect the coupler
securely.
open circuit.
and relay unit coupler.
(Sky blue–Sky blue)
ECU coupler.
(Blue/Yellow–Blue/Yellow)
(Code No.21)
Refer to "CHECKING THE
SWITCHES" on page 8-81.
Refer to "TRANSMISSION" on
page 5-84.
Reinstatement
method
engine, and
activating the
speed sensor
by operating the
vehicle.