Yamaha YXR70FX Service Manual page 293

Fault code No. 42
Diagnostic code No. d07
Order Item/components and probable
cause
1 Connections
• Speed sensor coupler
• Main wire harness-ECU coupler
2 Open or short circuit in speed sen-
sor lead.
3 Gear for detecting vehicle speed
has broken.
4 Defective speed sensor.
FUEL INJECTION SYSTEM
Symptom No normal signals are received from the speed sensor.
Speed sensor
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 "SIGNALING SYSTEM"
in chapter 9.
6 - 23
FI
Reinstatement
method
Starting the
engine, and
activating the
vehicle speed
sensor by oper-
ating the vehi-
cle at 20 to 30
km/h.