I'm putting a A/T PCM into a M/T ECM so I don't need to worry about actually hooking up a TCU. I just need to get the PCM functional and not trigger CEL or have any OBD checks uncompleted. Both of which will cause the vehicle to fail the emissions test.

In '97 on the A/T Sport there are only two pins that run from the ECM to the TCU. Engine->Trans Comm line and Engine Coolant Temp.

On the 2000-2004 Sport there's a bunch A/T stuff integrated into the PCM, a couple of which I know can be 'faked', but that leaves a bunch more that I'm pretty sure can't be. It appears to be even worse with the 5-speed A/T.

What the '99 looks like is still my big question. Guess I'll find out tomorrow when I start going through the manuals that showed up today.

I'm still trying to figure out how A/C Switch 2 is implemented on the '97s. It is, because when you turn on the A/C idle speed is increased, but I can't tell if that's done in the ECM or externally. I also can't tell if those two will trigger CEL if they're not connected.

Here's what i have so far ...

'99 Montero Sport A/T PCM to '97 Montero Sport Harness Pin-out


Edward