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Old 09-08-2009, 04:14 PM   #31 (permalink)
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Originally Posted by micondie View Post
I agree that you should check for a better wiring diagram. I have the two volume factory set for my Caravan and most of the second book is wiring diagrams. I my case the lockup is accomplished by grounding a lead from the transmission and I will have to wire it so the computer still sees voltage or it will think the solenoid is burnt out and set a code. In Mass I can't pass inspection with the check engine light on. The brake light switch sounds like the best option for unlock but I would suggest a bright RED light as a visual reminder. It shouldn't take long for you to get into the habit of unlocking, when was the last time you forgot to put in the clutch while driving a standard?
I don't have an electronically controlled transaxle. It's all hydraulic, and the only electronics on it are the neutral/park start switch and the reverse indicator switch.

I haven't seen any other wires anywhere on it that would be related to a lockup solenoid, so I have to assume that it's governor controlled, like my shifting.

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Old 01-09-2010, 11:17 PM   #32 (permalink)
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This link shows how to make a manual torque converter lockup switch for a dodge/cummins 48re transmission. The details will be different, but concept is the same. Beware, there are warnings about possible input shaft damage on stock components. I haven't done it yet, but am thinking about doing it in the future.

3rd Gen Mystery Switch - DIY - Works great! - Dodge Cummins Diesel Forum

Originally Posted by micondie View Post
I have been watching the SG in my 2003 Caravan 3.3 and noticing the increase in mileage when the transmission locks up. This happens about 42 MPH. This is a little fast for around town driving. Does anyone know what parameters the computer looks at when it locks up and if any of these parameters can be affected by altering sensor inputs without affecting driveability or mileage? This aproach seems to have the potential for significant improvements in city mileage.

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