Yamaha YFM700RV 2009 Service Manual page 268

Fault code No. 42
Diagnostic code No. A
Order Item/components and probable
cause
A-1 Connections
• Speed sensor coupler
• Main wire harness ECU coupler
A-2 Open or short circuit in speed sen-
sor lead.
A-3 Gear for detecting vehicle speed
has broken.
A-4 Defective speed sensor.
FUEL INJECTION SYSTEM
Symptom A. No normal signals are received from the speed sensor.
B. Open circuit is detected in the neutral switch.
D07 Speed sensor
B D21 Neutral switch
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 speed sensor coupler
and ECU coupler.
(blue–blue)
(white–white)
(black/blue–black/blue)
• Replace if defective.
Refer to "TRANSMISSION" in
chapter 4.
• Execute the diagnostic mode.
(Code No.D07)
• Replace if defective.
Refer to "CHECKING THE
SPEED SENSOR".
6 - 21
FI
Reinstatement
method
Starting the
engine, and
activating the
vehicle speed
sensor by oper-
ating the vehi-
cle at 20 to 30
km/h.