OK. Turns out that those pins in the above pic go to unlikely ecu killer candidates. Best I can tell they are pins 45 and 50 and go to fuse #1 and Inhibitor Switch / MPI Relay respectively.

I did pull my ICS and found that it is toast. Pins 1&2 and 4&5 test open on my multimeter (new one tests 42ohms at those points). I could have sworn I tested it before and it tested fine. Either it has since died or I suck at diagnostics. I'm leaning toward the latter...

So I have at least one explanation for dead ECU. However, I thought that happened over time. The ECU had been rebuilt and ASSUMED good AFTER my problems started. So that means that if the ECU is indeed dead again then just the occasional cranking during troubleshooting killed it. Can it happen with that little amt of exposure to the turned-evil ICS???

Does this...SPARK...any ideas for anyone? <img src="/forums/images/graemlins/butwiggle.gif" alt="" />


1991 Montero LS (LWB) 3.0L V6 Stock 205K Miles