Yamaha YFM70RY Service Manual page 332

Fault code No. 16
Diagnostic code No.
Order Item/components and probable
cause
1 Installed condition of throttle position
sensor.
2 Defective throttle position sensor.
Fault code No. 21
Diagnostic code No.
Order Item/components and probable
cause
1 Installed condition of coolant tempera-
ture sensor.
2 Connections
• Coolant temperature sensor coupler
• Main wire harness-ECU coupler
3 Open or short circuit in wire harness.
4 Defective coolant temperature sensor. • Execute the diagnostic mode.
Symptom Stuck throttle position sensor detected.
d01 Throttle position sensor
Symptom Coolant temperature sensor: open or short circuit detect-
ed.
d06 Coolant temperature sensor
FUEL INJECTION SYSTEM
Check or maintenance job
• Check the installed area for
looseness or pinching.
• Check that the throttle position
sensor is installed in the speci-
fied position.
Refer to "ADJUSTING THE
THROTTLE POSITION SEN-
SOR" on page 7-7.
• Execute the diagnostic mode.
(Code No. d01)
• Replace if defective.
Refer to "CHECKING THE
THROTTLE POSITION SEN-
SOR" on page 8-73.
Check or maintenance job
Check the installed area for
looseness or pinching.
• Check the coupler for any pins
that may have pulled out.
• Check the locking condition of
the coupler.
• If there is a malfunction, repair it
and connect the coupler se-
curely.
• Repair or replace if there is an
open or short circuit.
• Between coolant temperature
sensor coupler and ECU cou-
pler.
(black/blue–black/blue)
(black/yellow–black/yellow)
(Code No. d06)
• Replace if defective.
Refer to "CHECKING THE
COOLANT TEMPERATURE
SENSOR" on page 8-72.
8-43
Reinstatement
method
Reinstated by
starting the en-
gine, operating
it at idle, and
then racing it.
Reinstatement
method
Turning the
main switch to
ON.