Hi
I am not clear as to the issue. If I understand correctly when you put the directional level to right, the rear wheel turns to 90, (parallel with back plate), but the front wheels do not turn to 90 also. If this is the case then first check the rear wheel 90 proxy sensor has been activated. When it activates it changes the oil supply in the 6 port to turn the front wheels to 90, until the front wheels reach the 90 proxy, then the cycle is complete.

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your decription of the fault is bit unclear but i suggest that you check to see if the rear wheel sensor when rear wheel is at zero is lighting up and isworking and not moved out of position and check all wheel stops and front sensors on left wheel maybe this isyour problem as i did not fully understand your fault but it appears to be sensor related