Yamaha 2004 YP400 Service Manual page 314

Fault code No. 12
Used diagnostic code No. – –
Order Inspection operation item and
probable cause
1 Installed condition of sensor.
2 Connected condition of connector.
Inspect the coupler for any pins
that may have pulled out.
Check that the coupler is con-
nected securely.
NOTE:
Set the main switch to OFF before
connecting or disconnecting the
connector.
3 Open or short circuit in wiring har-
ness.
4 Defective crankshaft position sen-
sor.
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/blue – white/blue
white/red – white/red
Replace if defective.
Refer to "IGNITION SYSTEM" in chapter 8.
7 - 13
FI
Reinstatement
method
Reinstated by
cranking the
engine.