Yamaha XF50W, Service Manual

Page: 267 / 338

FUEL INJECTION SYSTEM
FI ifl
Fault code No. 46 Symptom Power supply to FI system is not normal. (red lead)
Used diagnostic code No. --
Order
Inspection operation item and
probable cause
Operation item and countermeasure
Reinstatement
method
1
2
3
4
Connected condition of con-
nector
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.
ECU coupler
Reinstated by start-
ing the engine and
operating it at idle. 1
2
3
4
Faulty battery Replace or charge the battery.
Refer to “CHECKING AND CHARGING THE
BATTERY” in chapter 3.
Reinstated by start-
ing the engine and
operating it at idle. 1
2
3
4
Malfunction in rectifier/ regula-
tor Replace if defective.
Refer to “CHARGING SYSTEM” in chapter 8.
Reinstated by start-
ing the engine and
operating it at idle. 1
2
3
4 Open or short circuit in wiring
harness. Repair or replace if there is an open or short
circuit.
Between battery and ECU
red-red
Reinstated by start-
ing the engine and
operating it at idle.
Faulty ECU memory. (when this malfunction is detected in the ECU, the
Fault code No. 50 Symptom
fault code number might not appear on the meter.)
Used diagnostic code No. --
Order
Inspection operation item and
probable cause
Operation item and countermeasure
Reinstatement
method
1 Malfunction in ECU Replace the ECU. Reinstated by turn-
ing the main switch
ON.
7-24
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