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Just a quick update. Sent the computer off over the holidays to be repaired. Got it back and everything is working as it should. It has been 4 days of daily use without any trouble. I'm going to call this one fixed. Thanks for the help and ideas.

I do agree that would be the next step to further narrow faulty items. I feel that I do not have the proper equipment/knowledge to start testing the IGSW and MREL circuits within the ECU. I would probably do more harm than good. I'm confident that I've properly identified the fault, so...

I tried the fresh battery, still same results. I've tested and chased my tail a few times. When in the fail condition: key in on position, no CEL. IGSW to E1 at the ECU has always has voltage within specs. MREL to E1 at ECU has voltage below specs, also confirmed at Pin 1 on EFI Main...

Had a chance to finally dig into this a little more. Attempt to start car - CEL not illuminated when key is "on". Starter spins fine - car does not start. Tested for voltage between IGSW and E1 on ECU - 10 VDC Tested for voltage between MREL and E1 on ECU - 3 VDC Tested for voltage at EFI...

Thanks for the tips. My computer hasn't been rebuilt as far as I can tell. Is the purpose of testing +B with key on and off to check for open circuit while off? I haven't considered +B part of the picture because it is reactionary to the EFI MAIN relay and MREL. I'll do some poking around...

This is a copy and paste from the Club Lexus forum. Hasn't got much traffic over there. However, this seems to be a more technically inclined forum. Today my 93 SC400 started acting up on me. I went for a short drive and returned. Went back out a few hours later and would not start. The...