Yamaha FX Nytro FX10X, Service Manual

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