Yamaha PZ50W Service Manual page 284

Fault code No. 44
Diagnostic No. 60 (EEPROM improper cylinder indication)
Order Item/components and probable cause
1 Malfunction in ECU.
Fault code No. 46
Diagnostic code No. – –
Order Item/components and probable cause
1 Connections
Wire harness ECU coupler
2 Faulty battery.
3 Malfunction in rectifier/regulator.
4 Open or short circuit in wire harness.
Fault code No. 50
Diagnostic code No. – –
Order Item/components and probable cause
1 Malfunction in ECU.
FUEL INJECTION SYSTEM
Symptom Error is detected while reading or writing on EEPROM (CO adjustment
value).
Check or maintenance job
Execute the diagnostic mode (code No. 60).
1. Check the faulty cylinder. (If both cylinders are
defective, the display alternates every 2 sec-
onds.)
2. Readjust the CO of the displayed cylinder.
Replace ECU if defective.
Symptom Power supply to the fuel injection system is not normal.
Check or maintenance job
Check 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 the
coupler securely.
Replace or charge the battery.
Refer to "BATTERY INSPECTION" in CHAPTER
2.
Replace if defective.
Refer to "CHARGING SYSTEM" in CHAPTER 8.
Repair or replace if there is an open or short cir-
cuit.
• Between battery and ignition fuse.
Red – Red
• Between ignition fuse and main switch coupler.
Red/Yellow – Red/Yellow
• Between main switch coupler and load control
relay coupler.
Brown – Brown
• Between load control relay coupler and ECU
coupler.
Brown/Blue – Brown/Blue
Faulty ECU memory. (When this malfunction is detected in the ECU, the
Symptom
fault code number might not appear on the meter.)
Check or maintenance job
Replace the ECU.
7-24
FI
Reinstatement
method
Turning the
main switch on.
Reinstatement
method
Starting the
engine and
operating it at
idle.
Reinstatement
method
Turning the
main switch on.