Yamaha 2007 FZ6-NA Service Manual page 425

Fault code No. 42 Symptom
Diagnostic code No.
Item/components and probable
Order
Connected state of connector
• Neutral switch coupler
• Main wire harness ECU coupler
B-1
Open or short circuit in neutral switch
lead.
B-2
Faulty shift drum (neutral detection
B-3 area)
Defective neutral switch.
B-4
Fault code No. 43 Symptom The ECU is unable to monitor the battery voltage.
Diagnostic code No. 50
Item/components and probable
Order
Connected state of connector
• Fuel injection system relay coupler
• Main wire harness ECU coupler
1
Open or short circuit in the wire har-
ness.
2
Malfunction or open circuit in fuel
injection system relay
3
A. No normal signals are received from the rear wheel
sensor. (with ABS)
B. Open or short circuit is detected in the neutral switch.
A 07 Speed sensor
B 21 Neutral switch
cause
Fuel injection system relay
cause
FUEL INJECTION SYSTEM
Check or maintenance job
• 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.
• Repair or replace if there is an
open or short circuit.
• Between neutral switch connec-
tor and relay unit coupler
(Sky blue–Sky blue)
• Replace if defective.
Refer to "TRANSMISSION" on
page 5-74.
• Execute the diagnostic mode.
(Code No.21)
• Replace if defective.
Refer to "CHECKING THE
SWITCHES" on page 8-109.
Check or maintenance job
• 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 it securely.
• Repair or replace if there is an
open or short circuit.
• Main wire harness
(Red–Red)
(Red/Black–Red/Black)
(Red/Blue–Red/Blue)
(Blue/Yellow–Blue/Yellow)
• Execute the diagnostic monitor-
ing mode. (Code No. 50)
• Replace if defective.
• If there is no malfunction with
the fuel injection system relay,
replace the ECU.
8-52
Reinstate-
ment method
Starting the
engine, and
inputting the
vehicle speed
signals by
operating the
vehicle at a 20
to 30 km/h.
Reinstate-
ment method
Starting the
engine and
operating it at
idle.