Yamaha XF50W Service Manual page 256

Fault code No. 12
Used diagnostic code No. --
Inspection operation item and
Order
probable cause
1 1 1 1
Installed condition of sensor.
2 2 2 2
Connected condition of con-
nector.
Inspect the coupler for any
pins that may have pulled
out.
Check that the coupler is
connected securely.
NOTE:
Set the main switch to OFF
before connecting or discon-
necting the connector.
3 3 3 3 Open or short circuit in wiring
harness.
4 4 4 4 Defective crankshaft position
sensor.
FUEL INJECTION SYSTEM
Symptom No normal signals are received from the crankshaft position sensor.
Operation item and countermeasure
Check the installed area for looseness or
pinching.
If there is a malfunction, repair it and connect
it securely.
Crankshaft position sensor coupler
Main wiring harness ECU coupler
Repair or replace if there is an open or short
circuit between the main wiring harnesses.
Between sensor coupler and ECU coupler.
white/red
black/blue
Replace if defective.
Refer to "IGNITION SYSTEM" in chapter 8.
7-13
FI ifl
Reinstatement
method
Reinstated by crank- Reinstated by crank- Reinstated by crank- Reinstated by crank-
ing the engine. ing the engine. ing the engine. ing the engine.