Yamaha YZ450FA 2011 Owner's Service Manual page 302

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Fault code No.
Symptom
Fail-safe system
Diagnostic code No.
FI diagnostic tool dis-
play
Checking method
Item Item/components and probable cause Check or maintenance job
1
Malfunction in ECU.
Fault code No.
Symptom
Fail-safe system
Diagnostic code No.
FI diagnostic tool dis-
play
Checking method
Item Item/components and probable cause Check or maintenance job
1
Check the connection and locking con-
dition of the FI diagnostic tool coupler.
Disconnect the coupler and check the
pins. (bent or broken terminals and
locking condition of the pins)
50
ECU internal malfunction
Unable to start
Unable to drive
Replace the ECU.
waiting for connection
Communication signal is not received.
Able to start (unable when ECU is malfunctioning)
Able to drive vehicle (unable when ECU is malfunctioning)
Poor connection → Properly
connect, repair, or replace.
7-40
FUEL INJECTION SYSTEM
Checking method
Set the switch on the
FI diagnostic tool sub-
wire harness to "ON",
and then check the
fault code display.
Fault code number is
not displayed → Ser-
vice is finished.
Checking method
Set the switch on the
FI diagnostic tool sub-
wire harness to "ON",
and then check the
fault code display.
Fault code number
is not displayed →
Service is finished.
Fault code number
is displayed → Re-
fer to item 2.

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