Yamaha YZ450FF 1SL-28199-11, Owner'S Service Manual

Page: 307 / 358

FUEL INJECTION SYSTEM
8-17
2 Defective intake air pressure
sensor.
Execute the diagnostic mode.
(Code No. 03)
Atmospheric pressure at the
current altitude and weather
conditions is indicated.
0 m above sea level: About
101 kPa
1000 m above sea level:
About 90 kPa
2000 m above sea level:
About 80 kPa
3000 m above sea level:
About 70 kPa
Fault code 15
Symptom Throttle position sensor: open or short circuit detected.
Fail-safe system Able to start engine
Able to drive vehicle
Diagnostic code No. 01
Diagnostic tool display Displays the throttle angle.
• 11–14 (throttle in fully closed position)
• 109–116 (throttle in fully opened position)
Procedure Check with throttle valves fully closed.
Check with throttle valves fully opened.
Or-
der
Probable cause of malfunc-
tion and check
Maintenance job Reinstatement method
1 Connection of throttle posi-
tion sensor coupler.
Check the locking condition
of the coupler.
Disconnect the coupler, and
check the pins (for bent or
broken terminals and locking
condition of the pins).
Improperly connected

Connect the coupler secure-
ly, or repair/replace the wire
harness.
Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played

Repair is finished.
Fault code No. is displayed

Go to next order.
2 Connection of wire harness
ECU coupler.
Check the locking condition
of the coupler.
Disconnect the coupler, and
check the pins (for bent or
broken terminals and locking
condition of the pins).
Improperly connected

Connect the coupler secure-
ly, or repair/replace the wire
harness.
Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played

Repair is finished.
Fault code No. is displayed

Go to next order.
Fault code 14
Symptom
Intake air pressure sensor: hose system malfunction (clogged
or detached hose)