Yamaha XP500 Service Manual page 467

Fault code No. 44
Used diagnostic No. 60 (EEPROM improper cylinder indication)
Order Inspection operation item and
probable cause
1 Malfunction in ECU (engine)
Fault code No. 46
Used diagnostic code No. – –
Order Inspection operation item and
probable cause
1 Faulty battery
2 Open or short circuit in wiring har-
ness.
3 Connected condition of connector
Inspect the coupler for any pins
that may have pulled out.
Check the locking condition of the
coupler.
Fault code No. 50
Used diagnostic code No. – –
Order Inspection operation item and
probable cause
1 Malfunction in ECU (engine)
FUEL INJECTION SYSTEM
Symptom Error is detected while reading or writing on EEPROM (CO adjustment value).
Operation item and countermeasure
Execute diagnostic code 60
• Check the faulty cylinder. (If there are multiple
cylinders, the number of the faulty cylinders
appear alternately at 2-second intervals.)
• Readjust the CO of the displayed cylinder.
Refer to "ADJUSTING THE EXHAUST GAS
VOLUME" in chapter 3. Replace ECU (engine)
if defective.
Symptom Power supply to the fuel pump relay is not normal.
Operation item and countermeasure
Replace or change the battery
Refer to "CHECKING AND CHARGING THE BAT-
TERY" in chapter 3.
Repair or replace if there is an open circuit.
• Between battery and main switch
• Between main switch and fuse (ignition)
• Between fuse (ignition) and ECU (engine)
If there is a malfunction, repair it and connect it
securely.
ECU (engine) coupler
Symptom Faulty ECU (engine) memory. (When this malfunction is detected in the ECU
(engine), the fault code number might not appear on the meter.)
Operation item and countermeasure
Replace the ECU (engine)
red – red
brown/blue – brown/blue
red/white – red/white
7 - 22
FI
Reinstatement
method
Reinstated by turn-
ing the main switch
ON.
Reinstatement
method
Reinstated by
starting the engine
and operating it at
idle.
Reinstatement
method
Reinstated by turn-
ing the main switch
ON.