FUEL INJECTION SYSTEM
8-46
Fault code No.
21
Symptom Coolant temperature sensor: open or short circuit detect-
ed.
Diagnostic code No.
06
Coolant temperature sensor
Order Item/components and probable
cause
Check or maintenance job
Reinstatement
method
1
Installed condition of coolant tempera-
ture sensor
Check the installed area for
looseness or pinching.
Setting the
main switch to
“ON”.
2
Connected state of connector
• Coolant temperature sensor coupler
• Main wire harness ECU coupler
• 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.
3
Open or short circuit in wire harness.
• 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)
4
Defective coolant temperature sensor. • Execute the diagnostic monitor-
ing mode. (Code No.06)
• Replace if defective.
Refer to “CHECKING THE
COOLANT TEMPERATURE
SENSOR” on page 8-73.
YamahaR125.COM
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