Yamaha YZF-R1 (2006) [374/426] Fuel injection system

Yamaha YZF-R1 (2006) [374/426] Fuel injection system
FUEL INJECTION SYSTEM
8-51
Fault code No. 23 Symptom
Atmospheric pressure sensor: open or short circuit
detected.
Diagnostic code No. 02 Atmospheric pressure sensor
Orde
r
Item/components and probable
cause
Check or maintenance job
Reinstatement
method
1 Connections
Atmospheric pressure sensor cou-
pler
Main wire harness ECU coupler
Check the coupler for any pins
that may have pulled out.
Check the locking condition of
the coupler.
If there is a malfunction, repair it
and connect the coupler
securely.
Reinstated
automatically if
a normal signal
is received.
2 Open or short circuit in wire harness
and/or sub wire harness 2.
Repair or replace if there is an
open or short circuit.
Between atmospheric pressure
sensor coupler and ECU cou-
pler.
(Black/Blue–Black/Blue)
(Pink–Pink)
(Blue–Blue)
3 Defective atmospheric pressure sen-
sor.
Execute the diagnostic mode.
(Code No.02)
Replace if defective.
Refer to "CHECKING THE
ATMOSPHERIC PRESSURE
SENSOR" on page 8-90.
Fault code No. 24 Symptom
No normal signal is received from the O
2
sensor.
Diagnostic code No.
Orde
r
Item/components and probable
cause
Check or maintenance job
Reinstatement
method
1 Installed state of O
2
sensor. Check for looseness or pinching. Execute the
diagnostic
mode (Code
No. 63). (Set
the engine stop
switch to “ ”.)
2 Connections
•O
2
sensor coupler
Main wire harness ECU coupler
Check the couplers for any pins
that may be pulled out.
Check the locking condition of
the couplers.
If there is a malfunction, repair it
and connect the coupler
securely.
3 Open or short circuit in wire harness. Repair or replace if there is an
open or short circuit.
Between O
2
sensor coupler and
ECU coupler.
(Gray/Green–Gray/Green)
(Black/Blue–Black/Blue)
4 Check fuel pressure. Refer to "THROTTLE BODIES"
on page 7-4.
5Defective O
2
sensor. Replace if defective.

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