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You're on Bowen Island, hey? I'm in Surrey. Trying to hypermile in the lower mainland is pretty much impossible because most people are simply just a-holes when it comes to driving. I guess that's another reason for going with the ecomod angle vs. the hypermile with what you got.
Electronics guy? Eep. Not quite. I know just enough to be dangerous. Very dangerous.
I read my Matrix shop manual a bunch today, focusing on transmission logic. The TC solenoid has one wire from the ECM that gets 12V when lockup is demanded, and grounds internally. There are 3 relevant fault codes that I am sure to run into:
1. P0741 - TC clutch performance: there is a turbine speed sensor that gets compared to engine speed to make sure the TC lockup clutch is working properly. The MIL will turn on if it thinks it is not locking when it wants lockup, or locking when it doesn't want lockup. Fortunately, this fault requires two driving cycles to trip, which may be enough grace to prevent the MIL from turning on with mixed highway/city driving.
2. P2769 - TC solenoid open, 3. P2770 - TC solenoid short. The solenoid should be between 11 and 15 ohms. However, P2769 will trip if goes above 100K ohms and P2770 below 8 ohms. That's a nice wide range, so I can add another relay and circuit with a resistor with a resistance of anything in between those to fool the ECM into thinking there is still a solenoid there. A small light bulb will be perfect.
I will have a diagram of this soon. Then, testing.
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