Yamaha YZ 2023 Series Owner's Service Manual page 325

Fault code No. 44
TIP
Before troubleshooting, disconnect the starter motor lead from the starter relay.
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Diagnostic tool display
Procedure
Probable cause of malfunc-
Item
tion and check
1 Identification of malfunctioning
point.
2 "01" is indicated in diagnostic
mode. (Code No. 60)
EEPROM data error for adjust-
ment of CO concentration.
3 "07" is indicated in diagnostic
mode. (Code No. 60)
EEPROM data error for setting
tool adjustment values for fuel
injection amount or ignition tim-
ing.
4 Faulty ECU.
5 Delete the fault code.
44
EEPROM fault code number: an error is detected while reading or
writing on EEPROM.
Able/Unable to start engine
Able/Unable to drive vehicle
60
Displays the location of the abnormal portion of the EEPROM data.
• 00: No fault
• 01: CO adjustment valve
• 07: Power Tuner injection correction setting 0–8, or Power Tuner igni-
tion timing correction setting 0–8
—
Maintenance job
Execute the diagnostic mode.
(Code No. 60)
00: Go to item 4.
01: Go to item 2.
07: Go to item 3.
Change the CO concentration,
and rewrite in EEPROM.
After this adjustment, push the
engine stop switch, and then
push the start switch.
Erase the setting map in the
diagnostic mode. (Code No. 65)
Replace the ECU.
Confirm that the fault code has
a condition of "Recovered"
using the Yamaha diagnostic
tool, and then delete the fault
code.
8-38
FUEL INJECTION SYSTEM
Confirmation of service com-
pletion
Start switch to ON (main relay
ON), and then check the condi-
tion of the fault code using the
malfunction mode of the
Yamaha diagnostic tool.
Condition is "Recovered"  Go
to item 5 and finish the service.
Condition is "Detected" 
Repeat item 1.
If the same number is indicated,
go to item 4.
Start switch to ON (main relay
ON), and then check the condi-
tion of the fault code using the
malfunction mode of the
Yamaha diagnostic tool.
Condition is "Recovered"  Go
to item 5 and finish the service.
Condition is "Detected" 
Repeat item 1.
If the same number is indicated,
go to item 4.
Service is finished.