Yamaha YZF-R1 (2006) [373/426] Fuel injection system

Yamaha YZF-R1 (2006) [373/426] Fuel injection system
FUEL INJECTION SYSTEM
8-50
Fault code No. 21 Symptom
Coolant temperature sensor: open or short circuit
detected.
Diagnostic code No. 06 Coolant temperature sensor
Orde
r
Item/components and probable
cause
Check or maintenance job
Reinstatement
method
1 Connections
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 couplers.
If there is a malfunction, repair it
and connect the coupler
securely.
Reinstated
automatically if
a normal signal
is received.
2 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.
(Green/White–Green/White)
(Black/Blue–Black/Blue)
3 Defective coolant temperature sensor. Execute the diagnostic mode.
(Code No.06)
Replace if defective.
Refer to "CHECKING THE
COOLANT TEMPERATURE
SENSOR" on page 8-88.
Fault code No. 22 Symptom Air temperature sensor: open or short circuit detected.
Diagnostic code No. 05 Air temperature sensor
Orde
r
Item/components and probable
cause
Check or maintenance job
Reinstatement
method
1 Connections
Air 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 the coupler
securely.
Reinstated
automatically if
a normal signal
is received.
2 Open or short circuit in wire harness. Repair or replace if there is an
open or short circuit.
Between air temperature sensor
coupler and ECU coupler.
(Brown/White–Brown/White)
(Black/Blue–Black/Blue)
3 Defective air temperature sensor. Execute the diagnostic mode.
(Code No.05)
Replace if defective.
Refer to "CHECKING THE
INTAKE AIR TEMPERATURE
SENSOR" on page 8-91.

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