Yamaha FJR13AEV(C) Service Manual page 558

Fault code No. 31
Diagnostic code No.
Order Item/components and probable
cause
1 Connections
• O sensor coupler
2
• Relay unit coupler
• Wire harness ECU coupler
• Sub-wire harness coupler
• Front cowling wire harness coupler
2 Open or short circuit in wire harness,
sub-wire harness, and/or front cowling
wire harness.
3 Defective O sensor
2
4 Clogged injector
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
• Check the coupler for any pins
• Check the locking condition of
• If there is a malfunction, repair it
• Repair or replace if there is an
• Between O
• Between O
• Between O
Replace if defective. (Unable to
output a rich signal)
• Replace if defective.
8-87
FUEL INJECTION SYSTEM
that may be pulled out.
the coupler.
and connect the coupler se-
curely.
open or short circuit.
sensor coupler and
2
ECU coupler.
(black/blue–black/blue)
(gray/white–gray/white)
sensor coupler and
2
relay unit coupler.
(red/blue–red/blue)
sensor coupler and
2
sub-wire harness coupler.
(black–black)
Refer to "CHECKING THE IN-
JECTORS" on page 7-8.
Reinstatement
method
Starting the en-
gine, warming it
up until the
coolant temper-
ature is 60 °C
or more, and
then running it
between 2000–
3000 r/min un-
til the engine
trouble warn-
ing light turns
off.