Yamaha FX10X Service Manual page 588

Fault code No. 14
Diagnostic code No. 03 (intake air pressure sensor 1 (cylinders #1, #2, and #3))
Order Item/components and probable cause
1 Intake air pressure sensor 1 (cylinders
#1, #2, and #3) hoses are detached,
clogged, kinked, or pinched.
2 Intake air pressure sensor 1 (cylinders
#1, #2, and #3) malfunction at intermedi-
ate electrical potential.
3 Connections
Intake air pressure sensor 1 (cylinders
#1, #2, and #3) coupler
Wire harness ECU coupler
4 Defective intake air pressure sensor 1
(cylinders #1, #2, and #3).
Fault code No. 15
Diagnostic code No. 01 (throttle position sensor)
Order Item/components and probable cause
1 Installed condition of throttle position
sensor.
2 Connections
Throttle position sensor coupler
Wire harness ECU coupler
Fuel injection system sub-wire har-
ness coupler
3 Open or short circuit in wire harness
and/or fuel injection system sub-wire
harness.
4 Throttle position sensor lead open circuit
output voltage check.
5 Defective throttle position sensor.
FUEL INJECTION SYSTEM
Intake air pressure sensor 1 (cylinders #1, #2, and #3): hose system mal-
Symptom
function (clogged or detached hose).
Check or maintenance job
Repair or replace the intake air pressure sensor 1
(cylinders #1, #2, and #3) hoses.
Check and repair the connection.
Replace it if there is a malfunction.
Check the couplers for any pins that may have
pulled out.
Check the locking condition of the couplers.
If there is a malfunction, repair it and connect the
coupler securely.
Execute the diagnostic mode (code No. 03).
Replace if defective.
Refer to "Fault code No. 13".
Symptom Throttle position sensor: open or short circuit detected.
Check or maintenance job
Check for looseness or pinching.
Check that it is installed in the specified position.
Refer to "THROTTLE BODY".
Check the couplers for any pins that may have
pulled out.
Check the locking condition of the couplers.
If there is a malfunction, repair it and connect the
coupler securely.
Repair or replace if there is an open or short cir-
cuit.
Between the throttle position sensor coupler and
ECU coupler.
Black/Blue – Black/Blue
Yellow – Yellow
Blue – Blue
Check for open circuit and replace the throttle
position sensor.
Black/Blue – Yellow
Open circuit item
Ground wire open cir-
cuit
Output wire open circuit
Power supply wire
open circuit
Execute the diagnostic mode (code No. 01).
Replace if defective.
Refer to "THROTTLE BODY".
7-14
FI
Reinstatement
method
Starting the
engine and
operating it at
idle.
Reinstatement
method
Setting the
engine stop
switch to "RUN"
and turning the
main switch on.
Output voltage
5 V
0 V
0 V