Yamaha RS90GTZ Service Manual page 347

Fault code No. 14
Diagnostic code No. d:03 (intake air pressure sensor 1 (cylinders #1, #2, and #3))
Item/components and probable cause
Order
Intake air pressure sensor 1 (cylinders #1,
1 #2, and #3) hoses are detached, clogged,
kinked, or pinched.
Defective intake air pressure sensor 1 (cyl-
2 inders #1, #2, and #3).
Fault code No. 15
Diagnostic code No. d:01 (throttle position sensor)
Item/components and probable cause
Order
Installed condition of throttle position sen-
1 sor.
Connections
• Throttle position sensor coupler
2 • Wire harness ECU coupler
Open or short circuit in wire harness.
3
Throttle position sensor lead open circuit
output voltage check.
4
Defective throttle position sensor.
5
6 Malfunction in ECU.
FUEL INJECTION SYSTEM
Intake air pressure sensor 1 (cylinders #1, #2, and #3): hose system malfunc-
Symptom
tion (clogged or detached hose).
Check or maintenance job
Repair or replace the intake air pressure sensor 1
(cylinders #1, #2, and #3) hoses.
Execute the diagnostic mode (code No. d: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 circuit.
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 posi-
tion sensor.
Black/Blue – Yellow
Open circuit item
Ground wire open circuit 5 V
Output wire open circuit
Power supply wire open
circuit
Execute the diagnostic mode (code No. d:01).
Replace if defective.
Refer to "THROTTLE BODY".
Replace the ECU.
Output voltage
0 V
0 V
7-20
FI
Reinstate-
ment method
Starting the
engine and
operating it at
idle.
Reinstate-
ment method
Setting the
engine stop
switch to
"RUN" and
turning the
main switch
on.