Yamaha YFM70RY Service Manual page 321

Self-diagnostic function table
Fault
code No.
Crankshaft position
12
sensor
Intake air pressure
13 sensor
(open or short circuit)
Intake air pressure
14 sensor
(hose line)
Throttle position sen-
15 sor
(open or short circuit)
Throttle position sen-
16 sor
(stuck)
Coolant temperature
21 sensor
(open or short circuit)
Intake air tempera-
22 ture sensor
(open or short circuit)
Lean angle sensor
30
(latch up detected)
Ignition coil
33
(faulty ignition)
Lean angle sensor
41
(open or short circuit)
Speed sensor
42
Neutral switch
Fuel system voltage
43
(monitoring voltage)
Error in writing the
44 amount of CO adjust-
ment on EEPROM
Vehicle system power
46 supply
(Monitoring voltage)
ECU internal malfunc-
50 tion
(memory check error)
Item
No normal signals are received
from the crankshaft position sen-
sor.
Intake air pressure sensor-open or
short circuit detected.
Intake air pressure sensor: hose
line malfunction (clogged or de-
tached hose).
Throttle position sensor: open or
short circuit detected.
Stuck throttle position sensor de-
tected.
Coolant temperature sensor: open
or short circuit detected.
Intake air temperature sensor:
open or short circuit detected.
The vehicle has overturned.
Malfunction detected in the prima-
ry wire of the ignition coil.
Lean angle sensor: open or short
circuit detected.
No normal signals are received
from the speed sensor.
Open or short circuit is detected in
the neutral switch.
The ECU is unable to monitor the
battery voltage
(an open or short circuit in the line
to the ECU).
Error is detected while reading or
writing on EEPROM (CO adjust-
ment value).
Power supply to the fuel injection
system is not normal.
Faulty ECU memory. (When this
malfunction is detected in the
ECU, the fault code number might
not appear on the meter.)
FUEL INJECTION SYSTEM
Symptom
8-32
Able / un-
Able / un-
able to
able to start
drive
Unable Unable
Able Able
Able Able
Able Able
Able Able
Able Able
Able Able
Unable Unable
Unable Unable
Unable Unable
Able Able
Able Able
Able Able
Able Able
Unable Unable