Yamaha R15 2022 Service Manual page 371

Fault code
Item
No.
P0122 [P0122] Throttle posi-
P0123 tion sensor (open or
short to ground circuit
is detected)
[P0123] Throttle posi-
tion sensor (short to
power circuit is detect-
ed.
P0117 [P0117] Coolant tem-
P0118 perature sensor (short
to ground circuit is de-
tected)
[P0118] Coolant tem-
perature sensor (open
or short to power cir-
cuit is detected.
SELF-DIAGNOSTIC FUNCTION AND
DIAGNOSTIC CODE TABLE
Symptom
[P0122] Low voltage
of the throttle position
sensor circuit (0.2 V
or less)
[P0123] High voltage
of the throttle position
sensor circuit (4.8 V
or more)
• Defective coupler
between throttle
body sensor assem-
bly and ECU.
• Open or short cir-
cuit in wire harness
between throttle
body sensor assem-
bly and ECU.
• Improperly installed
throttle body sensor
assembly.
• Defective throttle
position sensor.
• Malfunction in ECU.
[P0117] Low voltage
of the coolant temper-
ature sensor circuit
(0.2 V or less)
[P0118] High voltage
of the coolant temper-
ature sensor circuit
(4.8 V or more)
• Defective coupler
between coolant
temperature sensor
and ECU.
• Open or short cir-
cuit in wire harness
between coolant
temperature sensor
and ECU.
• Improperly installed
coolant temperature
sensor.
• Defective coolant
temperature sensor.
• Malfunction in ECU.
Possible cause
Engine idling speed is
high.
Engine idling speed is
unstable.
Engine response is
poor.
Loss of engine power.
Deceleration is poor.
Increased exhaust
emissions.
Engine is difficult to
start.
Increased exhaust
emissions.
Engine idling speed is
unstable.
8-38
ELEC – +
Remarks
Change in the throttle
opening value is 0
(transient control is
not carried out).
Throttle opening value
is fixed to 15 [°].
Intake air pressure is
fixed to 101.3 [kPa].
Fuel is not cut off due
to the throttle opening.
O feedback is not
2
carried out.
O feedback is not
2
carried out.
The coolant tempera-
ture is fixed to 30 [°C]
(when key is ON) or
80 [°C] (when riding).