Yamaha WR125R 2009 Service Manual page 332

Fault code No. 21
Diagnostic code No.
Order Item/components and probable
cause
1 Installed condition of coolant tempera-
ture sensor
2 Connections
• Coolant temperature sensor coupler
• Wire harness ECU coupler
3 Open or short circuit in wire harness.
4 Defective coolant temperature sensor. • Execute the diagnostic mode.
Symptom Coolant temperature sensor: open or short circuit detect-
ed.
D06 Coolant temperature sensor
FUEL INJECTION SYSTEM
Check or maintenance job
Check for looseness or pinching. Set the main
• 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 it securely.
• Repair or replace if there is an
open or short circuit.
• Between coolant temperature
sensor coupler and ECU cou-
pler.
(gray/black–gray/black)
(green/red–green/red)
(Code No.D06)
• Replace if defective.
Refer to "CHECKING THE
COOLANT TEMPERATURE
SENSOR" on page 8-75.
8-47
Reinstatement
method
switch to "ON".