Yamaha STAR XVS95CE 2DX1 2014 Service Manual page 378

Fault code No.
Item
4 Defective meter assembly.
5 Malfunction in ECU.
Er-4
ECU (engine control unit) internal malfunction (input signal er-
ror): non-registered data has been received from the meter.
Replace the meter assembly. Turn the main switch to "ON".
Replace the ECU.
7-65
FUEL INJECTION SYSTEM
Fault code number is not dis-
played → Service is finished.
Fault code number is dis-
played → Go to item 5.