Yamaha XF50W Service Manual page 264

Fault code No. 39
Used diagnostic code No. D36 (fuel injector)
Inspection operation item and
Order
probable cause
1 1 1 Connected condition of con-
nector
Inspect the coupler for any
pins that may have pulled
out.
Check the locking condition
of the coupler.
2 2 2 Open or short circuit in lead
wire.
3 3 3 Defective fuel injector
Fault code No. 41
Used diagnostic code No. D08 (lean angle cut-off switch)
Inspection operation item and
Order
probable cause
1 1 1 Connected condition of con-
nector
Inspect the coupler for any
pins that may have pulled
out.
Check the locking condition
of the coupler.
2 2 2 Open or short circuit in wiring
harness.
3 3 3 Defective lean angle cut-off
switch
FUEL INJECTION SYSTEM
Symptom
Operation item and countermeasure
If there is a malfunction, repair it and connect
it securely.
Fuel injector coupler - orange/black
Main wiring harness ECU coupler
Repair or replace if there is an open or short
circuit.
Between fuel injector coupler and ECU cou-
pler/main harness
orange/black - orange/black
Execute the diagnostic mode (code No. D36)
Replace if defective.
Symptom Lean angle cut-off switch open or short circuit is detected.
Operation item and countermeasure
If there is a malfunction, repair it and connect
it securely.
Lean angle cut-off switch coupler
Main wiring harness ECU coupler
Repair or replace if there is an open or short
circuit.
Between switch coupler and ECU coupler
black/blue - black/blue
yellow/green - yellow/green
blue- blue
Execute the diagnostic mode (code No. D08)
Replace if defective.
Refer to Fault code No. 30.
Fuel injector open or short circuit is detected.
7-21
FI ifl
Reinstatement
method
Reinstated by start- Reinstated by start- Reinstated by start-
ing the engine. ing the engine. ing the engine.
Reinstatement
method
Reinstated by turn- Reinstated by turn- Reinstated by turn-
ing the main switch ing the main switch ing the main switch
ON. ON. ON.