Yamaha XF50W Service Manual page 259

Fault code No. 16
Used diagnostic code No. D01 (throttle position sensor)
Inspection operation item and
Order
probable cause
1 1 1 Installed condition of throttle
position sensor.
2 2 2 Defective throttle position sen-
sor
3 3 3 When fault code No.15 has
been detected
Fault code No. 19
Used diagnostic code No. D20 (sidestand switch :option)
Inspection operation item and
Order
probable cause
1 1 Connected state of connector
Main wiring harness ECU cou-
pler
(blue/yellow connector)
2 2 Open or short circuit in wiring
harness and/or sub lead.
FUEL INJECTION SYSTEM
Symptom
Operation item and countermeasure
Check the installed area for looseness or
pinching.
Check that it is installed in the specified posi-
tion.
Refer to "THROTTLE BODY AND FUEL IN-
JECTOR ".
Execute the diagnostic mode (code No. 01)
Replace the throttle body.
NOTE:
Do not remove the sensor assembly (MAQS).
Refer to "THROTTLE BODY AND FUEL IN-
JECTOR ".
Refer to "Fault code No.15".
Symptom Open circuit in the input line of ECU (blue/yellow lead) detected.
Operation item and countermeasure
Execute the diagnostic mode (code No. D20)
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
it securely.
Repair or replace if there is an open circuit.
Between main switch coupler and ECU cou-
pler.
blue/yellow - blue/yellow
Sidestand switch signal input line of main
switch coupler.
blue/green - blue/green
Stuck throttle position sensor detected.
7-16
FI ifl
Reinstatement
method
Reinstated by start- Reinstated by start-
ing the engine, oper- ing the engine, oper-
ating it at idle, and ating it at idle, and
then racing it. then racing it.
Refer to "Fault code
No. 15".
Reinstatement
method
Reinstated by recon- Reinstated by recon-
necting the wiring necting the wiring
and retracting the and retracting the
sidestand. sidestand.