Yamaha Fazer FZ8-SA, Service Manual

Page: 461 / 610

FUEL INJECTION SYSTEM
8-66
Fault code No. 20
Item
Intake air pressure sensor or atmospheric pressure sensor: when
the main switch is set to “ON”, the atmospheric pressure sensor
voltage and intake air pressure sensor voltage differ greatly.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. d:02, d:03
d:02
Meter display Displays the atmospheric pressure.
Procedure
Compare the actually measured atmospheric pressure with the
meter display value.
d:03
Meter display Displays the intake air pressure.
Procedure
Set the engine stop switch to “ ”, and then operate the throttle
while pushing the start switch “ ”. (If the display value changes,
the performance is OK.)
Item/components and
probable cause
Check or maintenance job
Sensor inspection proce-
dure
1 Intake air pressure sensor
malfunction Check in the diagnostic mode
(Code No. d03).
When engine is stopped:
Atmospheric pressure at the
current altitude and weather
conditions is indicated.
0 m above sea level: Approx.
101 kPa
3000 m above sea level:
Approx. 70 kPa
Incorrect indication
→
Sensor
malfunction
→
Replace the
intake air pressure sensor.
Sensor inspection procedure
Refer to “CHECKING THE
INTAKE AIR PRESSURE
SENSOR” on page 8-201.
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.
2 Atmospheric pressure sensor
malfunction Check in the diagnostic mode
(Code No. d02).
When engine is stopped:
Atmospheric pressure at the
current altitude and weather
conditions is indicated.
0 m above sea level: Approx.
101 kPa
3000 m above sea level:
Approx. 70 kPa
Incorrect indication
→
Sensor
malfunction
→
Replace the
atmospheric pressure sensor.
Sensor inspection procedure.
Refer to “CHECKING THE
ATMOSPHERIC PRES-
SURE SENSOR” on page 8-
200.
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.