Whirlpool yrouble

I am new here but need help in fixing a whirlpool WTW4800XQ0.
It starting with flashing lid lock and badly drained clothes. I replaced lid lock assembly and still struggled.
Went to town printed out manual ( to include French pages at a dime a page- ).

Have now learned to read codes, run manual test and with my limited tools run some of the individual component test. As of now :
After trying a run I always get same fault code F7E1-
- Belt good, motor turns freely , have continuity thru shift motor but do not have proper led or plug puller to go further on shifter testing
- No other code.
Have run calibration. Successfully goes thru but I had no way of knowing agitation or spin area once lid is locked so I used piece of wood and block the top cover/door up a couple of inches . This allowed lido arch to secure during calibration but also allowed me to see tub. No agitation or spin it a torque type movement of drum. And a back and forth washing type sound. But after this all LEDs flash for a bit and the lid lock flashes.

In running many test.
- lid lock good
- Cold fill good
- Hot fill good
- Drain pump good
- But can't run agitate(s) or spin(s) test . Lid lock won't come on.
What next. I detest repair by trial and error of just replacing parts till it runs again. Besides I can afford it.
Can a faulty shifter be the source of all problems - no spin , no agitate, no lid lock during manual spin and agitate testing ?

Appreciate any help you all can give .

Thanks

Denny

via Whirlpool yrouble
by Denny T