Yamaha YZ450FA 2011 Owner's Service Manual page 288

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 intake air temperature sen-
sor coupler.
Disconnect the coupler and check the
pins. (bent or broken terminals and
locking condition of the pins)
2 Check the connection and locking con-
dition of the wire harness ECU coupler.
Disconnect the coupler and check the
pins. (bent or broken terminals and
locking condition of the pins)
3 Continuity of harness
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.
Poor connection → Properly
connect, repair, or replace.
Poor connection → Properly
connect, repair, or replace.
Open or short circuit → Re-
place.
Between the intake air tem-
perature sensor coupler and
ECU coupler.
(Brown/White–Brown/
White)
(Black/Blue–Black/Blue)
7-26
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 →
Service is finished.
Fault code number
is displayed → Re-
fer to item 2.
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 3.
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 4.