Yamaha XP500, Service Manual

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7 - 13
FI
FUEL INJECTION SYSTEM
Fault code No. 12 Symptom No normal signals are received from the crankshaft position sensor.
Used diagnostic code No. – –
Order Inspection operation item and
probable cause Operation item and countermeasure Reinstatement
method
1 Installed condition of sensor Check the installed area for looseness or pinching. Reinstated by
cranking the
engine.
2 Defective crankshaft position sen-
sor. Replace if defective.
1. Disconnect the crankshaft position sensor cou-
pler from the wire harness.
2. Connect the pocket tester (
Ω ×
100) to the crank-
shaft position sensor coupler as shown.
3. Measure the crankshaft position sensor resis-
tance.
4. Is the crankshaft position sensor OK?
3 Open or short circuit in wiring har-
ness. Repair or replace if there is an open or short circuit
between the main wiring harnesses.
Between sensor coupler and ECU (engine) coupler
black/yellow – black/yellow
black/blue – black/blue
4 Connected condition of connector
Inspect the coupler for any pins
that may have pulled cut.
Check the locking condition of the
coupler.
If there is a malfunction, repair it and connect it
securely.
Crankshaft position sensor coupler
Main wiring harness ECU (engine) coupler
Positive tester probe
→
gray
1
Negative tester probe
→
black
2
Gy
B
2 1
Crankshaft position sensor resis-
tance
189 ~ 231
Ω
at 20 °C (68 °F)
(between gray and black)