Yamaha YP125R, Service Manual

Page: 436 / 498

FUEL INJECTION SYSTEM
8-39
Fault code No. 16
Item
Throttle position sensor: stuck throttle position sensor is de-
tected.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. 01
FI diagnostic tool display
Throttle angle
• 9–22 (fully closed position)
• 93–106 (fully opened position)
Checking method
• Check with throttle fully closed.
• Check with throttle fully opened.
Probable cause of malfunction Check or maintenance job
1 Installed condition of throttle position
sensor. • Check for looseness or pinching.
• Check that the sensor is installed in the speci-
fied position.
2 Defective throttle position sensor. • Execute the diagnostic mode. (Code No. 01)
• Replace if defective.
Refer to “CHECKING THE THROTTLE POSI-
TION SENSOR” on page 8-88.
Reinstatement method Turning the main switch to “ON”.
Fault code No. 19
Item
Sidestand switch: a break or disconnection of the blue/yellow
lead of the ECU is detected.
Fail-safe system
Unable to start engine
Unable to drive vehicle
Diagnostic code No. 20
FI diagnostic tool display
Sidestand switch
• ON (stand retracted)
• OFF (stand extended)
Checking method Extend and retract the sidestand.
Probable cause of malfunction Check or maintenance job
1 Connections
• Wire harness ECU 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.
2 Open or short circuit in wire harness. • Repair or replace if there is an open or short
circuit.
• Between ECU and blue/yellow lead.
3 Defective sidestand switch. • Execute the diagnostic mode. (Code No. 20)
• Replace if defective.
Refer to “CHECKING THE SWITCHES” on
page 8-73.