Yamaha YZ 2019 Series Owner's Service Manual page 337

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 Locate the malfunction.
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 Malfunction in ECU.
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
EEPROM fault code display
• 00: No fault
• 01: CO adjustment value
• 07: Setting tool adjustment values 0–8 for fuel injection amount or igni-
tion timing
—
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, then push
the start switch.
Erase the setting map in the
diagnostic mode. (Code No. 65)
Replace the ECU.
8-38
FUEL INJECTION SYSTEM
Confirmation of service com-
pletion
—
Push the start switch.
Fault code number is not dis-
played  Service is finished.
Fault code number is displayed
 Repeat the procedure in item
1. If the same number is indi-
cated, perform the procedure in
item 3.
Push the start switch.
Fault code number is not dis-
played  Service is finished.
Fault code number is displayed
 Repeat the procedure in item
1. If the same number is indi-
cated, perform the procedure in
item 4.