Yamaha 2007 XP500 Service Manual page 352

Communication error with the meter
Fault code
No.
ECU (engine) internal
Er-1 malfunction
(output signal error)
ECU (engine) internal
Er-2 malfunction
(output signal error)
ECU (engine) internal
Er-3 malfunction
(output signal error)
ECU (engine) internal
Er-4 malfunction
(input signal error)
Item
No signals are received from the ECU
(engine).
No signals are received from the ECU
(engine) within the specified duration.
Data from the ECU (engine) cannot
be received correctly.
Non-registered data has been
received from the meter.
FUEL INJECTION SYSTEM
Symptom
8-37
Able / Able /
unable to unable to
start drive
Unable Unable
Unable Unable
Unable Unable
Unable Unable