Yamaha MT-01 T 2005 Service Manual page 350

Fault
code Symptom
No.
No normal signals are
received from the speed
42 sensor.
Open circuit is detected in
the neutral switch.
The ECU is unable to
monitor the battery voltage
43
(an open or short circuit in
the line to the ECU).
Error is detected while
reading or writing on
44
EEPROM (CO adjustment
value).
Power supply to the fuel
46 injection system is not
normal.
Faulty ECU memory.
(When this malfunction is
50 detected in the ECU, the
fault code number might
not appear on the meter.)
Muffler cooling fan
62 temperature sensor: open
or short circuit detected.
Engine trouble warning
light is flashing.
(Abnormally high
63
temperature is detected by
muffler cooling fan
temperature sensor.)
No signals are received
Er-1
from the ECU.
No signals are received
Er-2 from the ECU within the
specified duration.
Data from the ECU cannot
Er-3
be received correctly.
FUEL INJECTION SYSTEM
Probable cause of malfunction
• Open circuit in wire harness.
• Defective speed sensor.
• Malfunction in vehicle speed sensor
detected.
• Defective neutral switch.
• Malfunction in the engine side of the neutral
switch.
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Malfunction in ECU.
• Malfunction in ECU. (The CO adjustment
value is not properly written on or read from
the internal memory).
Malfunction in the charging system. Refer to
"CHARGING SYSTEM" on page 7-11.
• Malfunction in ECU. (The program and data
are not properly written on or read from the
internal memory.)
• Open or short circuit in wire harness.
• Defective muffler cooling fan temperature
sensor.
• Malfunction in ECU.
• Improperly installed sensor.
• Muffler cover fan fuse or ECU fuse is blown.
• Defective muffler cooling fan temperature
sensor or muffler cooling fan motor relay
• Positions of muffler cooling fan temperature
sensor and its surrounding parts changed
due to deformed parts near sensor
• Muffler cooling fan temperature sensor
detected a temperature of 120 °C (248 °F)
or higher.
• Open or short circuit in wire harness.
• Malfunction in meter.
• Malfunction in ECU.
• Defective wire connection of the ECU
coupler.
• Improper connection in wire harness.
• Malfunction in meter.
• Malfunction in ECU.
• Improper connection in wire harness.
• Malfunction in meter.
• Malfunction in ECU.
7-35
Diagnostic
code No.
07
21
09
60
—
—
12
63
—
—
—