Yamaha 2005 MT-01, Service Manual

Page: 358 / 435

FUEL INJECTION SYSTEM
7-43
Fault code No. 15 Symptom Throttle position sensor: open or short circuit detected.
Diagnostic code No. 01 Throttle position sensor
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
1 Installed condition of throttle position
sensor. • Check for looseness or
pinching.
• Check that the sensor is
installed in the specified
position.
Turning the
main switch to
“ON”.
2 Connections
• Throttle position sensor coupler
• Main wire harness ECU coupler
• Sub-wire harness 2 coupler • 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.
3 Open or short circuit in wire harness
and/or sub lead. • Repair or replace if there is an
open or short circuit.
• Between throttle position
sensor coupler and ECU
coupler
(blue–blue)
(yellow–yellow)
(back–black)
4 Throttle position sensor lead wire
open circuit output voltage check. • Check for open circuit and
replace the throttle position
sensor.
(black–yellow)
Open circuit
item Output voltage
Ground wire
open circuit 5 V
Output wire
open circuit 0 V
Power supply
wire open
circuit 0 V
5 Defective throttle position sensor. • Execute the diagnostic mode.
(Code No.01)
• Replace if defective.
Refer to “CHECKING THE
THROTTLE POSITION
SENSOR” on page 7-104.