2008 Yamaha WaveRunner FX SHO / FX Cruiser SHO Service Manual, Page 319Get this manual
Control system
ECM circuit
1Measure: ECM input voltage Out of specification Check the ECM circuitMeasurement steps: 1Disconnect the ECM coupler 12Push the unlock button, and then measure the input voltage between the ECM coupler terminal (wiring harness end) and groundNOTE: Do not disconnect the coupler or coupler when measuring the ECM input voltageECM input voltage: Redyellow (RY) Ground 12 (battery voltage)