Yamaha WR125R 2009, Service Manual

Page: 324 / 372

FUEL INJECTION SYSTEM
8-39
Sensor operation table
46
Power supply to the fuel in-
jection system is not nor-
mal.
• Malfunction in the charging system. Refer
to “CHARGING SYSTEM” on page 8-11.
—
50
Faulty ECU memory.
(When this malfunction is
detected in the ECU, the
fault code number might
not appear on the FI diag-
nostic tool.)
• Malfunction in ECU. (The program and data
are not properly written on or read from the
internal memory.) —
Diag-
nostic
code
No.
Item FI diagnostic tool display Checking method
D01 Throttle angle Check for changes in dis-
played values while open-
ing and closing the throttle.
• Fully closed position 14–20
• Fully open position 97–107
D03 Intake air pressure Displays the intake air pres-
sure. Set the engine stop switch
to “
”, and then operate
the throttle while pushing
the start switch “
”. (If the
display value changes, the
performance is OK.)
D05 Intake air temperature Displays the intake air tem-
perature. Compare the actually mea-
sured intake air tempera-
ture with the FI diagnostic
tool display value.
D06 Coolant temperature Displays the coolant temper-
ature. Compare the actually mea-
sured coolant temperature
with the FI diagnostic tool
display value.
D07 Vehicle speed pulse 0–999 Check that the number in-
creases when the front
wheel is rotated. The num-
ber is cumulative and does
not reset each time the
wheel is stopped.
D08 Lean angle sensor Remove the lean angle
sensor and incline it more
than 65 degrees.
• Upright 0.4–1.4
• Overturned 3.7–4.4
D09 Fuel system voltage
(battery voltage) 0–18.7
Approximately 12.0 Compare with the actually
measured battery voltage.
(If the battery voltage is
low, recharge the battery.)
Fault
code
No.
Symptom Probable cause of malfunction
Diagnostic
code No.