Yamaha YZF-R125 Service Manual page 309

YamahaR125.COM
Fault
code Symptom
No.
No normal signals are re-
42 ceived from the speed sen-
sor.
Error is detected while
44 reading or writing on EE-
PROM.
Power supply to the fuel in-
46 jection system is not nor-
mal.
Faulty ECU memory.
(When this malfunction is
detected in the ECU, the
50
fault code number might
not appear on the LCD of
the FI diagnostic tool.)
Sensor operation table
Diag-
nostic
code
No.
01 Throttle angle
• Fully closed position
• Fully open position
03 Intake air pressure
05 Intake air temperature
06 Coolant temperature
07 Vehicle speed pulse
• Open or short circuit in wire harness.
• Defective speed sensor.
• Malfunction in vehicle speed sensor detect-
ed.
• 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 8-11.
• Malfunction in ECU. (The program and data
are not properly written on or read from the
internal memory.)
Item FI diagnostic tool display
14–20
97–107
Displays the intake air pres-
sure.
Displays the intake air tem-
perature.
Displays the coolant temper-
ature.
0–999
FUEL INJECTION SYSTEM
Probable cause of malfunction
8-38
Diagnostic
code No.
07
60
—
—
Checking method
Check for changes in dis-
played values while open-
ing and closing the throttle.
Set the engine stop switch
to " ", then operate the
throttle while pushing the
start switch " ". (If the dis-
play value changes, the
performance is OK.)
Compare the actually mea-
sured air temperature with
the display value.
Compare the actually mea-
sured coolant temperature
with the meter display val-
ue.
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.