Yamaha XV19SX(C) Service Manual page 449

Fault code No. 42
Diagnostic code No.
Order Item/components and probable
cause
B-1 Connections
• Neutral switch coupler
• Main wire harness ECU coupler
B-2 Open circuit in neutral switch lead.
B-3 Faulty shift drum (neutral detection ar-
ea).
B-4 Defective neutral switch.
Symptom A. No normal signals are received from the speed sensor.
B. Open circuit is detected in the neutral switch.
A 07 Speed sensor
B 21 Neutral switch
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 neutral switch coupler
• Between relay unit coupler and
• Between main switch and ECU
• Replace if defective.
• Execute the diagnostic mode.
• Replace if defective.
7-58
FUEL INJECTION SYSTEM
that may be pulled out.
the coupler.
and connect the coupler se-
curely.
open circuit.
and relay unit coupler (fuel
pump relay).
(sky blue–sky blue)
main switch.
(blue/yellow–blue/yellow)
coupler.
(blue/black–blue/black)
Refer to "TRANSMISSION" on
page 5-112.
(Code No.21)
Refer to "CHECKING THE
SWITCHES" on page 7-71.
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.