Yamaha FX Nytro FX10X, Service Manual

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7-15
FI
FUEL INJECTION SYSTEM
Fault code No. 16 Symptom Stuck throttle position sensor detected.
Diagnostic code No. 01 (throttle position sensor)
Order Item/components and probable cause Check or maintenance job Reinstatement
method
1 Installed condition of throttle position
sensor. Check for looseness or pinching.
Check that it is installed in the specified position.
Refer to “THROTTLE BODY”. Starting the
engine, operat-
ing it at idle, and
then racing it.
2 Defective throttle position sensor. Execute the diagnostic mode (code No. 01).
Replace if defective.
Refer to “THROTTLE BODY”.
Fault code No. 21 Symptom Coolant temperature sensor: open or short circuit detected.
Diagnostic code No. 06 (coolant temperature sensor)
Order Item/components and probable cause Check or maintenance job Reinstatement
method
1 Connections
Coolant temperature sensor coupler
Wire harness ECU coupler
Coolant temperature sensor sub-lead
coupler
Check the couplers 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. Setting the
engine stop
switch to “RUN”
and turning the
main switch on.
2 Open or short circuit in wire harness
and/or coolant temperature sensor sub-
lead coupler. Repair or replace if there is an open or short cir-
cuit.
Between the coolant temperature sensor coupler
and ECU coupler.
Black/Blue – Black/Blue
Green/White – Green/White
3 Defective coolant temperature sensor. Execute the diagnostic mode (code No. 06).
Replace if defective.
Refer to “SIGNAL SYSTEM” in CHAPTER 8.
Fault code No. 22 Symptom Intake air temperature sensor: open or short circuit detected.
Diagnostic code No. 05 (intake air temperature sensor)
Order Item/components and probable cause Check or maintenance job Reinstatement
method
1 Connections
Intake air temperature sensor coupler
Wire harness ECU coupler
Check the couplers 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. Setting the
engine stop
switch to “RUN”
and turning the
main switch on.
2 Open or short circuit in wire harness. Repair or replace if there is an open or short cir-
cuit.
Between the intake air temperature sensor cou-
pler and ECU coupler.
Black/Blue – Black/Blue
Brown/White – Brown/White
3 Defective intake air temperature sensor. Execute the diagnostic mode (code No. 05).
Replace if defective.
Refer to “INTAKE AIR TEMPERATURE SEN-
SOR”.