Yamaha YP125R, Service Manual

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