Yamaha XF50W Service Manual page 265

Fault code No. 42
Used diagnostic code No. D07 (speed sensor)
Inspection operation item and
Order
probable cause
1 Connected condition of speed-
ometer connector
Inspect the coupler for any
pins that may have pulled
out.
Check the locking condition
of the coupler.
2 Open or short circuit in speed-
ometer lead.
3 Breakage speedometer cable or
speedometer gear unit.
4 Defective speed sensor.
FUEL INJECTION SYSTEM
Symptom No normal signals are received from the speed sensor.
Operation item and countermeasure
If there is a malfunction, repair it and connect
it securely.
Speedometer coupler
Main wiring harness ECU coupler
Repair or replace if there is an open or short
circuit.
Between speedometer coupler and ECU cou-
pler
white - white
black/blue - black/blue
Execute the diagnostic mode (code No.D07)
Checking the speedometer cable breakage
and loose connection.
Checking the movement of the speedometer
gear unit 1 .
Checking the breakage of the speedometer
clutch projections a and speedometer gear
unit slots b .
Execute the diagnostic mode (code No. D07)
Replace the meter assembly.
7-22
FI ifl
Reinstatement
method
Reinstated by input-
ting the vehicle speed
signals by turning the
front wheel.