Yamaha FJR13AEV(C) Service Manual page 559

Fault code No. 31
Diagnostic code No.
Order Item/components and probable
cause
5 The fuel pressure is too low.
Symptom The amount of air-fuel ratio feedback compensation is
maintained continuously in the vicinity of the upper limit
(lean air-fuel ratio).
01 Throttle position sensor
Check or maintenance job
• Compare the fuel pressures at
• About the same → Normal
• Too low → Refer to the following
• Check the fuel pump.
• Replace if defective.
• Check the delivery hose for
• Repair or replace if there is a
• Check the pressure regulator.
• Replace if defective.
• Check the throttle position sen-
• Execute the diagnostic mode.
• Replace if defective.
• Check the fuel system (discon-
• Repair or replace if there is a
• Check the intake system (im-
• Repair or replace if there is a
8-88
FUEL INJECTION SYSTEM
idle and with throttle open.
table.
Refer to "CHECKING THE
FUEL PUMP BODY" on page
7-3.
pinching or kinking.
malfunction.
Refer to "CHECKING THE
FUEL PRESSURE" on page
7-8.
sor.
(Code No.01)
nection, etc.).
malfunction.
proper sealing, etc.).
malfunction.
Reinstatement
method