Yamaha YZF-R1S Service Manual page 369

Fault code No. 23
Used diagnostic code No. 02 (atmospheric pressure sensor)
Order Inspection operation item and probable
cause
1 Connected condition of connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the
coupler.
2 Open or short circuit in wiring harness.
3 Defective atmospheric pressure sensor.
FUEL INJECTION SYSTEM
Symptom Open or short circuit detected from the atmospheric pressure sensor.
Operation item and countermeasure
If there is a malfunction, repair it and connect it
securely.
Atmospheric pressure sensor coupler
Main wiring harness ECU coupler
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
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.
Tester positive probe ! pink
Tester negative probe ! black / blue
2. Set the main switch to "ON".
3. Measure the atmospheric pressure sensor out-
put voltage.
4. Is the atmospheric pressure sensor OK?
7-25
1
Atmospheric pressure sensor
output voltage
3.75 X 4.25 V
FI
Reinstatement
method
Reinstated by
turning the
main switch
ON.
2