FUEL INJECTION SYSTEM
8-65
5 Malfunction in ECU. Replace the ECU.
Refer to “REPLACING THE
ECU (engine control unit)” on
page 8-174.
Fault code No. 42
Item
A
Rear wheel sensor: no normal signals are received from
the rear wheel sensor.
B Neutral switch: open or short circuit is detected.
C Clutch switch: open or short circuit is detected.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. 07
Meter display
Rear wheel speed pulse
0–999
Procedure
Check that the number increases when the rear wheel is rotated.
The number is cumulative and does not reset each time the wheel
is stopped.
Item
Probable cause of mal-
function and check
Maintenance job
Confirmation of service
completion
1 Locate the malfunction. Execute the diagnostic
mode. (Code No. 07)
Rotate the rear wheel by
hand and check that the indi-
cated value increases.
Value does not increase →
Go to item 2.
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”
Incorrect indication → Go to
item 2 in section B for the
neutral switch.
When the transmission is in
gear with the clutch lever
squeezed and the sidestand
retracted: “ON”
Incorrect indication → Go to
item 2 in section C for the
clutch switch.
2 Connection of rear wheel
sensor coupler.
Check the locking condition
of the coupler.
Disconnect the coupler and
check the pins (bent or bro-
ken terminals and locking
condition of the pins).
Improperly connected →
Connect the coupler secure-
ly or replace the wire har-
ness.
Execute the diagnostic
mode. (Code No. 07)
Rotate the rear wheel by
hand and check that the indi-
cated value increases.
Value increases → Go to
item 8 and delete the fault
code.
Value does not increase →
Go to item 3.
Fault code No. 41
Item Lean angle sensor: open or short circuit detected.
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