turn signal YAMAHA YZ450F 2012 Owners Manual

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FUEL INJECTION SYSTEM
4 Continuity of harness Open or short circuit → Replace.
Between injector coupler and ECU
coupler.
(Red–Red)
(Red/Black–Red/Black)Start the engine and let it
idle for approximately 5
seconds.
After completing the above
operation, check whether a
fault code number is dis-
played.
Fault code number is not
displayed → Service is
finished.
Fault code number is dis-
played → Refer to item
5.
5 Malfunction in ECU. Replace the ECU.
Fault code No. 41
Symptom Lean angle sensor malfunction. (the sensor is built into the ECU)
Fail-safe system Unable to start
Unable to drive
Diagnostic code No. D08
FI diagnostic tool display Lean angle sensor
• 1.0 V (Upright)
• 4.0 V (Overturned)
Checking method Remove the ECU and incline it 45 ° or more.
Item Item/components and probable cause Check or maintenance job Checking method
1 Malfunction in ECU. Replace the ECU. Fault code No. 39
Symptom Injection system circuit signal is not received properly.
Fail-safe system Unable to start
Unable to drive
Diagnostic code No. D36
FI diagnostic tool display Actuates the injector for five times every second.
The "WARNING" LED on the FI diagnostic tool comes on each time the fuel injector is ac-
tuated.
Checking method Check the operating sound of the injector five times.
Item Item/components and probable cause Check or maintenance job Checking method