ecm-903f code

Hello, That code refers to the electronic throttle system, where there is low or no signal. This may mean the throttle position sensor has failed, or you may have damaged wiring, or a bad engine control module. This issue can be resolved with the use of a diagnostic scan tool, and I would not attempt to correct the issue by swapping parts. There are some videos on youtube that show how to test a throttle position sensor, and that will allow you to see if it is working before taking it to shop. When you hit the gas with the engine in park, does it respond by increasing engine speed, or does it only slightly raise engine speed no matter how far you press the gas pedal?