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[Huh. That's interesting! I wonder what grounding the #10 pin does? I would conjecture that doing this prevents the ECU from trying to step the ISC while you are adjusting the base idle? I grounded the pin when I set my base idle speed a while ago (before finally replacing the ISC). It didn't seem to cause any problems...

Do you or anyone else have a copy of that FSB (TSB?)? I'd be interested in reading it...

Eric W.


I dont remember why.. your esplaination is good enuff

Might have been the russian pdf site-"how to use the factory tool manual" or it was a TSB.This is just memory so ... I think it said to disconnect the tool from the ASDL when setting idle because the the connector is grounding pin-10.

I let you know if I see it again

1989 5 door montero 3.0 auto
stock original Japanese
about 200k miles