Yamaha FZ09E Service Manual page 383

FUEL INJECTION SYSTEM
Fault code No. 21
Item Coolant temperature sensor: open or short circuit detected.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. 06
Meter display Displays the coolant temperature.
Procedure Compare the actually measured coolant temperature with the
meter display value.
Item Probable cause of Maintenance job Confirmation of service
malfunction and check completion
1 Connection of coolant tern- Improperly connected --+ Turn the main switch to "ON".
perature sensor coupler. Connect the coupler securely Fault code number is not dis-
Check the locking condition or replace the wire harness. played --+ Service is finished.
of the coupler. Fault code number is dis-
Disconnect the coupler and played
--+
Go to item 2.
check the pins (bent or bro-
ken terminals and locking
condition of the pins).
2
Connection of wire harness Improperly connected --+ Turn the main switch to "ON".
ECU coupler. Connect the coupler securely Fault code number is not dis-
Check the locking condition or replace the wire harness. played --+ Service is finished.
of the coupler. Fault code number is dis-
Disconnect the coupler and played
--+
Go to item 3.
check the pins (bent or bro-
ken terminals and locking
condition of the pins).
3
Wire harness continuity. Open or short circuit
--+
Turn the main switch to "ON".
Replace the wire harness. Fault code number is not dis-
Between coolant tempera-
played --+ Service is finished.
lure sensor coupler and ECU Fault code number is dis-
coupler. played
--+
Go to item 4.
green/white-green/white
Between coolant tempera-
ture sensor coupler and joint
connector.
black/blue- black/blue
Between joint connector and
ECU coupler.
black/blue- black/blue
4 Installed condition of coolant Improperly installed sensor Turn the main switch to "ON".
temperature sensor.
--+
Reinstall or replace the Fault code number is not dis-
Check for looseness or sensor. played
--+
Service is finished.
pinching. Fault code number is dis-
played
--+
Go to item 5.
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