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

Page: 306 / 358

FUEL INJECTION SYSTEM
8-16
TIP
If fault code Nos. 13 and 14 are both displayed, perform checkup and repair jobs for fault code No.
13 first.
6 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
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.
7 Faulty ECU Replace the ECU.
Fault code 14
Symptom
Intake air pressure sensor: hose system malfunction (clogged
or detached hose)
Fail-safe system Able to start engine
Able to drive vehicle
Diagnostic code No. 03
Diagnostic tool display Displays the intake air pressure.
Procedure The atmospheric pressure is displayed on the Yamaha diagnostic
tool.
Or-
der
Probable cause of malfunc-
tion and check
Maintenance job Reinstatement method
1 The intake air pressure sen-
sor hose is damaged, discon-
nected, clogged, twisted or
bent.
Repair or replace the sensor
hose.
After starting the engine, idle
this and wait about 5 sec-
onds.
Fault code No. is not dis-
played

Repair is finished.
Fault code No. is displayed

Go to next order.
Fault code 13
Symptom Intake air pressure sensor: open or short circuit detected.