2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 226Get this manual
TRBL SHTG
Troubleshooting
Symptom: Engine does not accelerate when the throttle is opened quicklyThe engine turns off when the throttle is opened quicklyAcceleration is tardy and the engine is likely to stop at any moment Check the engine using the diagnostic flash indicator or the Yamaha Diagnostic SystemSymptom: Engine can run, but engine speed will not increaseOverheat warning indicator is onOil pressure warning indicator is onWarning indicator is on and buzzer is sounding Check the cooling system Check the lubrication systemCooling system Check the cooling water inlet for clogs or debrisCheck that cooling water is discharged from the cooling water pilot hole