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FI
FUEL INJECTION SYSTEM
Code No. Symptom Probable cause of malfunction Diagnostic code
23
Atmospheric pressure sensor - open
or short circuit detected.
• Open or short circuit in wiring harness.
• Defective atmospheric pressure sensor.
• Improperly installed sensor.
• Malfunction in ECU.
02
24
No normal signals are received from
the O
2
sensor.
• Open or short circuit in wiring harness.
• Defective O
2
sensor.
• Malfunction in ECU.
• Improperly installed sensor.
—
30
The motorcycle has overturned. • Overturned.
• Malfunction in ECU.
08
31
The amount of air-fuel ratio feedback
compensation is maintained continu-
ously in the vicinity of the upper limit
(lean air-fuel ratio).
• Open or short circuit in wiring harness.
• Fuel pressure too low.
• Clogged injectors.
• Defective O
2
sensor (unable to output a rich signal).
• Malfunction in ECU.
• Malfunction in other areas of the fuel system.
—
32
The amount of air-fuel ratio feedback
compensation is maintained continu-
ously in the vicinity of the lower limit
(rich air-fuel ratio).
• Open or short circuit in wiring harness.
• Fuel pressure too high.
• Faulty injectors (excessive injection volume).
• Defective O
2
sensor (unable to output a lean signal).
• Malfunction in ECU.
• Malfunction in other areas of the fuel system.
—
33
Open circuit is detected in the primary
wire of the ignition coil (#1, 4).
• Open or short circuit in wiring harness.
• Malfunction in ignition coil.
• Malfunction in ECU.
• Malfunction in a component of ignition cutoff circuit system.
30
34
Open circuit is detected in the primary
wire of the ignition coil (#2, 3).
• Open or short circuit in wiring harness.
• Malfunction in ignition coil.
• Malfunction in ECU.
• Malfunction in a component of ignition cutoff circuit system.
31
41
Lean angle cut-off switch - open or
short circuit detected.
• Open or short circuit in wiring harness.
• Defective lean angle cut-off switch.
• Malfunction in ECU.
08
42
No normal signals are received from
the speed sensor; or, an open or
short circuit is detected in the neutral
switch.
• Open or short circuit in wiring harness.
• Defective speed sensor.
• Malfunction in vehicle speed sensor detected unit.
• Defective neutral switch.
• Malfunction in the engine side of the neutral switch.
• Malfunction in ECU.
07
21
43
The ECU is unable to monitor the bat-
tery voltage (an open circuit in the
monitor line to the ECU).
• Open circuit in wiring harness.
• Malfunction in ECU. —
44
An error is detected while reading or
writing on EEPROM.
• Malfunction in ECU. (The CO adjustment value is not prop-
erly written on or read from the internal memory).
60
50
Faulty ECU memory. When this mal-
function is detected, the code number
might not appear on the meter.
• Malfunction in ECU. (The program and data are not properly
written on or read from the internal memory.) —