Yamaha FZ09E Service Manual

FUEL INJECTION SYSTEMFault code N o. 21Item Cool an t tempe r ature sensor : open or short circuit detected.5 Defective coolant tempera· Execute the diagnostic Turn the ma in switch to "ON".ture sensor. mode. (Code No . 06) Fault code number is not di s·When engine is cold: played -+ Service is finished.Displayed temperature is Fault code number is dis·close to the ambient temper- played -+ Go to item 6.ature.The displayed temperature isnot close to the ambient tern·perature -+ Check the cool-ant temperature sensor.Replace if defective.Refer to "CHECKING T HECOOLANT TEMPERATURESENSOR" on page 8· 106.6 Ma lfunction in ECU. Replace the EC U.Refer to " REPLACING THEECU (engine control unit)" onpage 8· 93 .Fault code No . 22It em I ntake air temperature sensor: open or short circuit de tected.Fall-safe system Able to start engineAble to drive ve hicleDiagnostic code No. 05Meter display Displays the air temperatu re.Procedure Compare the actually measured air temperature with the meterdisplay value.Item Probable cause of Maintenance j ob Confirm ation of serv icemalfunction and check comp let io n1 Connection of intake air te rn - Imprope rl y connected -+ Turn the main switch to "ON".peratu re sensor coupler. Connect the coupler securely Fault code nu mber is not di s·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 lockingcondition of the pins).2 Connection of wire harness Improperly connected -+ Turn the main switch to "ON".ECU coupler. Connect the coupler securely Fault code nu mber is not di s·Check the locking condition or replace the wire harness. played -+ Se rvice 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 lockingcondition of the pins).8-49