Yamaha YZF-R1S Service Manual page 360

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 the locking condition of the
coupler.
3 Open or short circuit in wiring harness.
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
Gray – Gray
Black / Blue – Black / Blue
Replace if defective.
1. Disconnect the crankshaft position sensor cou-
pler from the wire harness.
2. Connect the pocket tester (Ω
crankshaft position sensor coupler as shown.
Tester positive probe ! gray
Tester negative probe ! black
3. Measure the crankshaft position sensor resis-
tance.
4. Is the crankshaft position sensor OK?
7-16
100) to the
1
2
2
Crankshaft position sensor
resistance
336 X 504 Ω at 20_C (68_F)
(between gray and black)
FI
Reinstatement
method
Reinstated by
cranking the
engine.
1