Yamaha YXR70FX Service Manual page 284

Fault code No. 14
Diagnostic code No. d03
Order Item/components and probable
cause
1 Intake air pressure sensor hose
2 Intake air pressure sensor mal-
function at intermediate electrical
potential.
3 Connections
• Intake air pressure sensor cou-
pler
• Main wire harness-ECU coupler
4 Defective intake air pressure sen-
sor.
FUEL INJECTION SYSTEM
Symptom Intake air pressure sensor: hose system malfunction
(clogged or detached hose).
Intake air pressure sensor
Check or maintenance job
• Check the intake air pressure
sensor hose condition.
• Repair or replace the sensor
hose.
• Check and repair the connec-
tion.
• Replace it if there is a malfunc-
tion.
• Check the coupler for any pins
that may be pulled out.
• Check the locking condition of
the coupler.
• If there is a malfunction, repair it
and connect the coupler
securely.
• Execute the diagnostic mode.
(Code No.d03)
• Replace if defective.
Refer to "CHECKING THE
INTAKE AIR PRESSURE SEN-
SOR".
6 - 14
FI
Reinstatement
method
Starting the
engine and
operating it at
idle.