Yamaha FJR1300A(D) - Page 498

FUEL INJECTION SYSTEM
8-49
Fault code No. 20
Item
Intake air pressure sensor or atmospheric pressure sensor:
when the main switch is turned to “ON”, the intake air pres-
sure sensor voltage and atmospheric pressure sensor voltage
differ greatly.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. 03, 02
03
Meter display Displays the intake air pressure.
Procedure
Shift the transmission into gear, extend the sidestand, and then
operate the throttle while pushing the “ ” side of the start/engine
stop switch. (If the display value changes, the performance is OK.)
02
Meter display Displays the atmospheric pressure.
Procedure
Compare the actually measured atmospheric pressure with the
meter display value.
Item
Probable cause of mal-
function and check
Maintenance job
Confirmation of service
completion
1 Defective intake air pressure
sensor.
Execute the diagnostic
mode. (Code No. 03)
When engine is stopped:
Atmospheric pressure at the
current altitude and weather
conditions is indicated.
0 m above sea level: Approx.
101 kPa (757.6 mmHg, 29.8
inHg)
3000 m (9800 ft) above sea
level: Approx. 70 kPa (525.0
mmHg, 20.7 inHg)
Displayed value is incorrect
→ Check the intake air pres-
sure sensor.
Replace if defective.
Refer to “CHECKING THE
INTAKE AIR PRESSURE
SENSOR” on page 8-189.
Turn the main switch to “ON”.
Fault code number is not dis-
played → Service is finished.
Fault code number is dis-
played → Go to item 2.