Yamaha YZF-R1S Service Manual - page 369
7-25
FUEL INJECTION SYSTEM
FI
Atmospheric pressure sensor
output voltage
3.75
X 4.25 V
Tester positive probe
! pink
Tester negative probe
! black/blue
1
2
Fault code No.
23
Symptom
Open or short circuit detected from the atmospheric pressure sensor.
Used diagnostic code No. 02 (atmospheric pressure sensor)
Order
Inspection operation item and probable
cause
Operation item and countermeasure
Reinstatement
method
1
Connected condition of connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the
coupler.
If there is a malfunction, repair it and connect it
securely.
Atmospheric pressure sensor coupler
Main wiring harness ECU coupler
Reinstated by
turning the
main switch
ON.
2
Open or short circuit in wiring harness.
Repair or replace if there is an open or short
circuit.
Between sensor coupler and ECU coupler
Blue – Blue
Black / Blue – Black / Blue
Pink – Pink
3
Defective atmospheric pressure sensor.
Execute the diagnostic mode (Code No.02).
Replace if defective.
1. Connect the pocket tester (DC 20 V) to the
atmospheric pressure sensor coupler terminal
as shown.
2. Set the main switch to “ON”.
3. Measure the atmospheric pressure sensor out-
put voltage.
4. Is the atmospheric pressure sensor OK?