I think at this point you are just confusing yourself and the pcm. On eec-iv , the first step is to check KOEO, then KOER. Disconnect the battery for a few minutes to clear all codes and memory. Start the engine so it can warm up, then shut it off. Then, KOEO tests. If any codes are shown, fix these first.
Then perform KOER tests. As the engine comes up to a fast idle, hit the brake, turn the steering wheel and cycle the overdrive switch. The scan tool will tell you when to floor and release the throttle, usually after the idle has returned to normal.
536 is a code for the brake pedal switch and easy to troubleshoot. 12 volts to t
he switch, and the signal return to the pcm pin#2. Should be a light green wire
Also, some of the cheaper scan tools will tell lies, so be aware of that.