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Old 04-01-2010, 03:32 AM   #16 (permalink)
mechman600
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Fusion - '16 Ford Fusion Hybrid SE
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I did a bit of digging:
http://picasaweb.google.ca/lh/photo/...eat=directlink

It appears that the three shift solenoids are single wire solenoids, powered by the ECU and grounded internally. But the TC lockup solenoid has two wires to the ECU, so it is powered and grounded by the ECU. The question is, does it receive power all the time and get switched on the ground side, or does it receive a ground all the time and get switched on the power side? I will have to do some multimeter testing with a helper and a test drive.

this conundrum will only determine how I will eventually wire in the control relay. Once I figure out what the circuit does, I may just wire in a temporary switch that I can flip while I am driving to see if the transmission responds with any ridiculous actions, and to see what speed and throttle position I will trim the control device to.

And now the control device. Disclaimer: I barely know electronics. just the basics. Here is what I have come up with:
http://picasaweb.google.ca/lh/photo/...eat=directlink

Quite simply, I take a voltage from the VSS signal, through a diode for safely. When the output of the pot (adjusted for proper speed calibration) reaches the correct voltage against the zener diode, it opens and triggers the transistor to allow current flow to the TC lockup override relay. The same happens from the TPS signal with the two transistors in series so the two conditions must be met. The capacitor on the output is to smoothen out fluctuations from the VSS signal.

So, does this have the potential to work?

Last edited by mechman600; 04-01-2010 at 03:43 AM..
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