2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 54Get this manual
Fuel system
Checking the throttle position sensor
1Check the throttle position sensor output voltage using the Yamaha Diagnostic SystemIf the output voltage is out of specification, replace the throttle position sensorThrottle position sensor output voltage at engine idle speed: 0.81.2 V
Installing the throttle position sensor
1Install the throttle position sensor in position where the output voltage is within specification