Yamaha YZ450FA 2011 Owner's Service Manual page 289

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
4 Installed condition of sensor.
5 Defective intake temperature sensor.
6 Malfunction in ECU.
22
Intake air temperature sensor signal is not received properly.
Able to start
Able to drive
D05
-20–100°C
Cold engine: Displayed temperature is close to the ambient temperature.
Warm engine: Displayed temperature is approximately 20 °C higher than
the ambient temperature.
Check the temperature in the intake manifold.
Check that the sensor is in-
stalled securely and that
there are no pinched
leads.Check that the ECU is
installed securely and that
there are no pinched leads.
Incorrect installation → Re-
install or repair.
Execute the diagnostic
mode (diagnostic code No.
D05).
Displayed value is incorrect
→ Replace.
Replace the ECU.
7-27
FUEL INJECTION SYSTEM
Cold engine: Displayed
temperature is close to the
ambient temperature.
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 5.
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 6.