Yamaha FZ8NA Service Manual page 501

Fault code No.
Item
Fail-safe system
Diagnostic code No.
Meter display
Procedure
Item/components and
probable cause
4 Abnormal meter unit opera-
tion
5 ECU malfunction
Er-4
ECU internal malfunction (input signal error): non-registered data
has been received from the meter.
Able to start engine
Able to drive vehicle
—
—
—
Check or maintenance job
Replace the meter unit.
Replace the ECU.
FUEL INJECTION SYSTEM
8-106
Sensor inspection proce-
dure
Place the main switch to the
ON position, and check the
fault code indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.