Yamaha RS90GTZ Service Manual page 348

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