Table of Contents
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Fault code No.
Item
B-4
Wire harness continuity.
B-5
Defective diode.
B-6
Defective gear position switch.
B-7
Faulty shift drum (neutral detec-
tion area).
B-8
Malfunction in ECU.
42
Speed sensor: no normal signals are received from the speed
A
sensor.
B
Gear position switch: open or short circuit is detected.
C
Clutch switch: open or short circuit is detected.
Open or short circuit → Replace
the wire harness.
Between ECU coupler and di-
ode 4.
black/yellow–black/yellow
Between diode 4 and diode 1.
yellow/black–yellow/black
Between diode 1 and gear posi-
tion switch coupler.
sky blue–sky blue
Check the diode 1.
Replace if defective.
Refer to "CHECKING THE DI-
ODES" on page 8-86.
Check the gear position switch.
Replace if defective.
Refer to "CHECKING THE
GEAR POSITION SWITCH" on
page 8-93.
Malfunction → Replace the shift
drum.
Refer to "TRANSMISSION" on
page 5-86.
Replace the ECU.
Refer to "REPLACING THE
ECU (engine control unit)" on
page 8-81.
8-56
FUEL INJECTION SYSTEM
Execute the diagnostic mode.
(Code No. 21)
When the transmission is in
neutral: "ON"
When the transmission is in
gear with the clutch lever re-
leased: "OFF"
Correct indication → Go to item
B-9 and delete the fault code.
Incorrect indication → Go to
item B-5.
Execute the diagnostic mode.
(Code No. 21)
When the transmission is in
neutral: "ON"
When the transmission is in
gear with the clutch lever re-
leased: "OFF"
Correct indication → Go to item
B-9 and delete the fault code.
Incorrect indication → Go to
item B-6.
Execute the diagnostic mode.
(Code No. 21)
When the transmission is in
neutral: "ON"
When the transmission is in
gear with the clutch lever re-
leased: "OFF"
Correct indication → Go to item
B-9 and delete the fault code.
Incorrect indication → Go to
item B-7.
Execute the diagnostic mode.
(Code No. 21)
When the transmission is in
neutral: "ON"
When the transmission is in
gear with the clutch lever re-
leased: "OFF"
Correct indication → Go to item
B-9 and delete the fault code.
Incorrect indication → Go to
item B-8.
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Table of Contents
Troubleshooting
