Yamaha YZ450FP 2023, Owner'S Service Manual

Page: 334 / 388

FUEL INJECTION SYSTEM
8-35
Fault code No. 44
TIP
Before troubleshooting, disconnect the starter motor lead from the starter relay.
1 Wire harness continuity. Open or short circuit

Replace
the wire harness.
Between battery terminal and
starter relay.
red–red
Between starter relay coupler
and joint connector.
red/yellow–red/yellow
Between joint connector and
ECU coupler.
red–red
Between ECU coupler and CCU
coupler.
brown–brown
Press the engine stop switch for
1 second or more, and then
press the start switch (no need
to start the engine).
Check the condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is “Recovered”

Go
to item 4 and finish the service.
Condition is “Detected”

Go to
item 2.
2 Malfunction in CCU. Replace the CCU. Press the engine stop switch for
1 second or more, and then
press the start switch (no need
to start the engine).
Check the condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is “Recovered”

Go
to item 4 and finish the service.
Condition is “Detected”

Go to
item 3.
3 Malfunction in ECU. Replace the ECU. Service is finished.
4 Delete the fault code. Confirm that the fault code has
a condition of “Recovered”
using the Yamaha diagnostic
tool, and then delete the fault
code.
Fault code No. 44
Item
EEPROM read error: an error is detected while reading or writing on
EEPROM.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No.
60
Diagnostic tool display
Displays the location of the abnormal portion of the EEPROM data.
•
00: No fault
•
01: CO adjustment value
•
07: Power Tuner injection correction setting 0–8, or Power Tuner igni-
tion timing correction setting 0–8
•
12: Throttle position when fully closed
Procedure
—
Item
Probable cause of malfunc-
tion and check
Maintenance job
Confirmation of service com-
pletion
Fault code No. 43
Item
Fuel system voltage: incorrect voltage supplied to the CCU, and
incorrect recognition voltage of the motorcycle.