Yamaha YFM70RY Service Manual page 328

Fault code No. 12
Diagnostic code No.
Order Item/components and probable
cause
1 Installed condition of crankshaft posi-
tion sensor
2 Connections
• Crankshaft position sensor coupler
• Main wire harness-ECU coupler
3 Open or short circuit in wire harness.
4 Defective crankshaft position sensor.
Symptom No normal signals are received from the crankshaft posi-
tion sensor.
— —
FUEL INJECTION SYSTEM
Check or maintenance job
Check for looseness or pinching. Cranking the
• 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 the coupler se-
curely.
• Repair or replace if there is an
open or short circuit.
• Between the crankshaft position
sensor coupler and ECU cou-
pler.
(blue/yellow–blue/yellow)
(black/blue–black/blue)
• Replace if defective.
Refer to "CHECKING THE
CRANKSHAFT POSITION
SENSOR" on page 8-68.
8-39
Reinstatement
method
engine.