To see anything happening, you would have to watch T4:0.ACC. When I:1/0 goes on, the value of T4:0.ACC should immediately jump to "20" seconds (or whatever T4:0.PRE is set), causing the timer to go DONE and start the Valve Open step on rung 002. If you want to "see" it, temporarily change the MOV to MOV "18" to the T4:0.ACC. Then you will see the timer jump from some smaller number to 18, then continue counting to 19, then 20.
This was an effort to not change any of your existing working logic. That is always the key factor when modifying a working program. It will work for you if when I:1/0 goes ON, you want the valve to immediately open, and the Soak Timer to start (which then starts the Spray Timer).