Yamaha YXR70FX Service Manual page 282

Fault code No. 12
Diagnostic code No. —
Order Item/components and probable
cause
1 Installed condition of crankshaft
position sensor.
2 Connections
• Crankshaft position sensor cou-
pler
• Main wire harness-ECU coupler
3 Open or short circuit in wire har-
ness.
4 Defective crankshaft position sen-
sor.
FUEL INJECTION SYSTEM
Symptom No normal signals are received from the crankshaft posi-
tion sensor.
—
Check or maintenance job
Check for looseness or pinching.
• 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.
• Repair or replace if there is an
open or short circuit.
• Between the crankshaft position
sensor coupler and ECU cou-
pler.
(gray–gray)
(black/blue–black/blue)
• Replace if defective.
Refer to "IGNITION SYSTEM" in
chapter 9.
6 - 12
FI
Reinstatement
method
Cranking the
engine.