Yamaha 2010 XMAX YP125R Service Manual page 445

Fault code No.
Item
Checking method
Probable cause of malfunction
1 Connections
• Wire harness ECU coupler
• Main switch coupler
2 Open or short circuit in the wire harness. • Repair or replace if there is an open or short
3 Malfunction or open circuit in fuel sys-
tem.
Reinstatement method
Fault code No.
Item
Fail-safe system
Diagnostic code No.
FI diagnostic tool display
Checking method
Probable cause of malfunction
1 Malfunction in ECU.
Reinstatement method
43
Fuel system voltage: the ECU is unable to monitor the battery
voltage (an open or short circuit in the line to the ECU).
Compare with the actually measured battery voltage. (If the bat-
tery voltage is low, perform recharging.)
• Check the coupler for any pins that may be
pulled out.
• Check the locking condition of the coupler.
• If there is a malfunction, repair it and connect
the coupler securely.
circuit.
• Between battery terminal and main switch
coupler.
(red–red)
• Between main switch coupler and ignition fuse
terminal.
(brown/blue–brown/blue)
• Between ignition fuse terminal and ECU cou-
pler.
(red/black–red/black)
• Execute the diagnostic mode. (Code No. 09)
Starting the engine and operating it at idle.
44
EEPROM fault code No.: an error is detected while reading or
writing on EEPROM (CO adjustment value).
Able to start engine
Able to drive vehicle
60
EEPROM fault code display
• 00 (no history)
• 01/03/04 (history exists)
—
• Execute the diagnostic mode (Code No. 60).
• Replace ECU if defective.
Turning the main switch to "ON".
8-48
FUEL INJECTION SYSTEM
Check or maintenance job
Check or maintenance job