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Are you getting thick, black smoke out the back? I think you have the readings backwards:

"Remember that {0 volts Maximum Lean} does not say that the car is running lean! It is saying is that the TCCS is leaning the BASIC FUEL CALCULATION to make the mixture perfect for the current conditions. There was too much fuel calculated for the BASIC FUEL CALCULATION causing the engine to run RICH for a short time so the TCCS is reducing the fuel amount from BASIC FUEL CALCULATION. The 0 voltage LEAN is a very safe or normal reading, it is telling you that there is plenty of room to add fuel, lots of correction reserve left. Many stock cars running at high altitude will show a 0 volt condition, high altitude is less air for the engine, so the TCCS cuts back some of the fuel to compensate for the to rich mixture"

My take on the whole thing is that 0v doesnt indicate that the fuel mixture is lean, it indicates that the computer is leaning the mixture to compensate for a rich condition. Whereas 5v would not indicate that the mixture is rich, it indicates that the computer is increasing the amount of fuel to correct a LEAN condition.
 
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