Yamaha MT-09 2021 - Page 513

9-83
EVENT CODE TABLE
241 O
2
sensor
(Stuck at the
lower limit for
adjustment)
During O
2
feed-
back, the adjust-
ment is maintained
at the lower limit
• Open or short circuit
in the wire harness
between the sensor
and ECU
• Drop in fuel pressure
• Clogged fuel injector
• Fault in sensor
• Malfunction in ECU
• Malfunction in the
fuel injection system
• If a DTC is occurring,
respond to that first.
* Rarely, Code 241 oc-
curs even when the sys-
tem is functioning
properly.
242 ISC
(Stuck at the up-
per limit for ad-
justment)
During idling, the
adjustment is main-
tained at the upper
limit
Idling engine speed is
slow
• Clogged throttle body
• Poorly adjusted
clutch cable
• Malfunction in the
fuel injection system
• Dirty or worn spark
plug
• Malfunction in the
battery
• Malfunction in ECU
• Implement diagnosis
mode D67, and check
the ISC maintenance
request.
• If a DTC is occurring,
respond to that first.
* Rarely, Code 242 oc-
curs even when the sys-
tem is functioning
properly.
243 ISC
(Stuck at the
lower limit for
adjustment)
During idling, the
adjustment is main-
tained at the lower
limit
Idling engine speed is
fast
• Poorly adjusted
clutch cable
• Malfunction in the
fuel injection system
• Dirty or worn spark
plug
• Malfunction in the
battery
• Malfunction in ECU
• If a DTC is occurring,
respond to that first.
* Rarely, Code 243 oc-
curs even when the sys-
tem is functioning
properly.
244 Poor starting/in-
ability to start
Poor starting/inabili-
ty to start detected
• No gasoline
• Malfunction in the
fuel injection system
• Dirty or worn spark
plug
• Malfunction in the
battery
• Malfunction in ECU
• If a DTC is occurring,
respond to that first.
* Rarely, Code 244 oc-
curs even when the sys-
tem is functioning
properly.
245 Engine stop Engine stop detect-
ed
• No gasoline
• Poorly adjusted
clutch cable
• Malfunction in the
fuel injection system
• Dirty or worn spark
plug
• Malfunction in the
battery
• Malfunction in ECU
• If a DTC is occurring,
respond to that first.
* Rarely, Code 245 oc-
curs even when the sys-
tem is functioning
properly.
No. Item Symptom Possible causes Note