Sounds like the input from the directional lever is working if the pump motor kicks into higher rpm.

I wouldnt think anything wrong with the steer sensors, relay 9 or the 6 port valve if you can manually steer into side mode as well.

Id be checking the 90 degree mode change solenoid on the electric section of the control valve to see if the coil is okay, connected and that the coil connector has a red light on it when you have selected side mode while in F/R mode.