Yamaha YFM70RY Service Manual page 337

Fault code No. 42
Diagnostic code No.
Order Item/components and probable
cause
1 Connections
• Neutral switch coupler
• Main wire harness-ECU coupler
2 Open circuit in neutral switch lead.
3 Faulty shift drum (neutral detection ar-
ea).
4 Defective neutral switch
Symptom B. Open circuit is detected in the neutral switch.
B d21 Neutral switch
FUEL INJECTION SYSTEM
Check or maintenance job
• Check the coupler for any pins
that may have pulled out.
• Check the locking condition of
the coupler.
• If there is a malfunction, repair it
and connect the coupler se-
curely.
• Repair or replace if there is an
open circuit.
• Between neutral switch connec-
tor and relay unit coupler.
(sky blue–sky blue)
• Between relay unit coupler and
ECU coupler.
(light green–brown)
(black/yellow–sky blue)
• Replace if defective.
Refer to "TRANSMISSION" on
page 5-65.
• Execute the diagnostic mode.
(Code No. d21)
• Replace if defective.
Refer to "CHECKING THE
SWITCHES" on page 8-57.
8-48
Reinstatement
method
Starting the en-
gine, and acti-
vating the
vehicle speed
sensor by oper-
ating the vehi-
cle at 20 to 30
km/h.