Quote:
Originally Posted by blageo23
I think that the ecu controls the tcu. It probably send info back and forth between the 2. I'm not an expert nor is this fact I'm just stating what I think.
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The ECU and TCU have one wire to talk to each other with. The TCU tells the ECU to reduce TQ (retards timing) when it's going to shift. That's the extent of the interface as I know it.