Yamaha XJR1300 2007 Service Manual page 308

Fault
code Item
No.
ECU internal
malfunction
Er-4
(input signal
error)
*If multiple malfunctions have been detected for the ECU or immobilizer unit, you may not be able to
start or drive the vehicle.
Non-registered data has been received from the
meter.
7-31
FUEL INJECTION SYSTEM
Symptom
Able / Able /
unable to unable to
start drive
*Able *Able