Yamaha XP500, Service Manual

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7 - 16
FI
FUEL INJECTION SYSTEM
Fault code No. 19 Symptom Open circuit is detected in the input line from the sidestand switch to the ECU
(engine).
Used diagnostic code No. 20 (sidestand switch)
Order Inspection operation item and
probable cause Operation item and countermeasure Reinstatement
method
1 Defective sidestand switch Replace if defective.
Refer to “CHECKING THE SWITCHES” in chapter
8. Reinstated by
retracting the side-
stand.
Reinstated by
reconnecting the
wiring.
2 Open or short circuit in wiring har-
ness. Repair or replace if there is an open or short circuit.
Between sidestand switch coupler and ECU
(engine) coupler
light green – light green
black – black
Fault code No. 21 Symptom Open or short circuit is detected from the coolant temperature sensor.
Used diagnostic code No. 06 (coolant temperature sensor)
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 turn-
ing the main switch
ON.
2 Defective coolant temperature sen-
sor. Replace if defective.
Refer to “COOLING SYSTEM” in chapter 8.
3 Open or short circuit in wiring har-
ness. Repair or replace if there is an open or short circuit.
Between sensor coupler and ECU (engine) coupler
black/blue – black/blue
green/red – green/red
4 Connected condition of connector
Inspect 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 it
securely.
Coolant temperature sensor coupler
Main wiring harness ECU (engine) coupler