Yamaha YZ 2020 Series Owner's Service Manual page 324

Fault code No.
Item
4 Defective main relay.
5 Malfunction in ECU.
6 Delete the fault code.
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.
43
Fuel system voltage: incorrect voltage supplied to the main relay
and CCU.
No operating sound  Replace
the main relay.
Or execute the diagnostic mode.
(Code No. 09)
Fuel system voltage is below 3
V  Replace the main relay.
Replace the ECU.
Confirm that the fault code has
a condition of "Recovered"
using the Yamaha diagnostic
tool, and then 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.
8-37
FUEL INJECTION SYSTEM
Press the start switch and the
engine stop switch alternately to
switch the power supply (= main
relay) from "ON  OFF  ON".
Check the condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recovered"  Go
to item 6 and finish the service.
Condition is "Detected"  Go to
item 5.
Service is finished.
Confirmation of service com-
pletion