2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 300Get this manual
FUEL INJECTION SYSTEM Er-1 Fault code NoEr-2 Er-3 Er-4 Diagnostic code No Order Itemcomponents and probable cause Connections Wire harness ECU coupler Speedometer unit sub-lead coupler Check or maintenance job Symptom Symptom Symptom Symptom No signals are received from the ECU
No signals are received from the ECU within the specified signal timeData from the ECU cannot be received correctlyNon-registered data has been received from the meter
Reinstatement method Setting the engine stop switch to "RUN" and turning the main switch on