Yamaha YXR70FX Service Manual page 285

Fault code No. 15
Diagnostic code No. d01
Order Item/components and probable
cause
1 Installed condition of throttle posi-
tion sensor.
2 Connections
• Throttle position sensor coupler
• Main wire harness-ECU coupler
3 Open or short circuit in wire har-
ness.
4 Throttle position sensor lead wire
open circuit output voltage check.
5 Defective throttle position sensor.
FUEL INJECTION SYSTEM
Symptom Throttle position sensor: open or short circuit detected.
Throttle position sensor
Check or maintenance job
• Check for looseness or pinching.
• Check that the sensor is installed
in the specified position.
• Check the coupler for any pins
that may be pulled out.
• Check the locking condition of
the coupler.
• If there is a malfunction, repair it
and connect the coupler
securely.
• Repair or replace if there is an
open or short circuit.
• Between throttle position sensor
coupler and ECU coupler
(blue–blue)
(yellow–yellow)
(black/blue–black/blue)
• Check for open circuit and
replace the throttle position sen-
sor.
(yellow–black/blue)
• Execute the diagnostic mode.
(Code No.d01)
• Replace if defective.
Refer to "CHECKING AND
ADJUSTING THE THROTTLE
POSITION SENSOR".
6 - 15
FI
Reinstatement
method
Turning the
main switch to
"ON".