Yamaha 2009 YZF-R1 (Y) Service Manual page 453

Fault code No.
Symptom
Fail-safe action
Diagnostic monitor-
ing code No.
Meter display
Checking method
Item/components and
probable cause
4 Atmospheric pressure sensor
malfunction
5 ECU malfunction
23
Open or short circuit of atmospheric pressure sensor lead
Engine startup: Possible
Riding: Possible
D:02
Displays the atmospheric pressure.
Compare the actually measured atmospheric pressure with the
meter display value.
Check or maintenance job
Check in the diagnostic mode
(Code No. 02).
Atmospheric pressure at the
current altitude and weather
conditions is indicated.
0 m above sea level: Approx.
101 kPa
1000 m above sea level:
Approx. 90 kPa
2000 m above sea level:
Approx. 80 kPa
3000 m above sea level:
Approx. 70 kPa
Incorrect indication → Sensor
malfunction → Replace the
atmospheric pressure sen-
sor.
Sensor inspection procedure
Refer to "CHECKING THE
ATMOSPHERIC PRES-
SURE SENSOR" on page 8-
140.
Replace the ECU.
FUEL INJECTION SYSTEM
8-62
Sensor inspection proce-
dure
Place the main switch to the
ON position, and check the
fault code indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.