Not fallowing the test your trying to run. Testing the block is from A2/S2 to the frame of the unit It should be open. I would start by there. This is what I do each time. I 1st check voltage to the frame to make sure my battery isn't shorting to the frame. Then I take off the power fuses and check them not connected to the unit. After if all this checks good I check my cables. I've had a lot of cables get damage at the donuts onto of the motor. I check check my motor. S1 to s2 the e1 to e2 and then across if this is good I then run test. Knowing on what part of the self test it fails I can determine where to start. I check s2 to frame. I dunno if this unit has regen but I've had regen drive me crazy with f2, 26 and 23. This can be disconnected. Say the short to frame, motor and block are good I then run my ramping test to make sure the power card is giving me the voltage to the Q1 and then I test the Q1 to see if it ramping too. I've also had Raymond's code out 23 and had to replace the Q1 power card and TMs all at once's. At times this is needed. Run the test exactly like this and let me know the out comes.