Yamaha YZF-R1 Series Service Manual page 563

No. Item
241 O sensor
2
(Stuck at the low-
er limit for adjust-
ment)
242 ISC
(Stuck at the up-
per limit for ad-
justment)
243 ISC
(Stuck at the low-
er limit for adjust-
ment)
244 Poor starting/in-
ability to start
245 Engine stop
251 Shift sensor
Symptom
During O feedback, • Open or short circuit in
2
the adjustment is
maintained at the low-
er limit
• Drop in fuel pressure
• Clogged fuel injector
• Fault in sensor
• Malfunction in ECU
• Malfunction in the fuel
During idling, the ad- Idling engine speed is
justment is main- slow
tained at the upper • Clogged throttle body
limit • Poorly adjusted clutch
• Malfunction in the fuel
• Dirty or worn spark
• Malfunction in the bat-
• Malfunction in ECU
During idling, the ad- Idling engine speed is
justment is main- fast
tained at the lower • Poorly adjusted clutch
limit
• Malfunction in the fuel
• Dirty or worn spark
• Malfunction in the bat-
• Malfunction in ECU
Poor starting/inability • No gasoline
to start detected • Malfunction in the fuel
• Dirty or worn spark
• Malfunction in the bat-
• Malfunction in ECU
Engine stop detected • No gasoline
• Poorly adjusted clutch
• Malfunction in the fuel
• Dirty or worn spark
• Malfunction in the bat-
• Malfunction in ECU
Brief abnormality de- Same as for DTC num-
tected in the shift sen- ber P1806 and P1807
sor
9-66
EVENT CODE TABLE
Possible causes
the wire harness be-
tween the sensor and
ECU
injection system
cable
injection system
plug
tery
cable
injection system
plug
tery
injection system
plug
tery
cable
injection system
plug
tery
Note
• If a DTC is occurring, re-
spond to that first.
* Rarely, Code 241 occurs
even when the system is
functioning properly.
• Implement diagnosis
mode D67, and check the
ISC maintenance request.
• If a DTC is occurring, re-
spond to that first.
* Rarely, Code 242 occurs
even when the system is
functioning properly.
• If a DTC is occurring, re-
spond to that first.
* Rarely, Code 243 occurs
even when the system is
functioning properly.
• If a DTC is occurring, re-
spond to that first.
* Rarely, Code 244 occurs
even when the system is
functioning properly.
• If a DTC is occurring, re-
spond to that first.
* Rarely, Code 245 occurs
even when the system is
functioning properly.
Perform the inspection
items listed for DTC num-
be r P1806 and P1807.