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There is a 4-wire plug on the transmission. It is on the drivers side and toward the front of the car. You can probably see it near the oxygen sensor. It is easier to get to if you remove the air cleaner tube. If this connector is not plugged in, then the Torque Converter Lockup feature will not work. You can also trace these wires back to the ECM to see if you can find a short or open in the circuit. Matt Howard

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Q: Why does transmission lock up does not work on a Pontiac fiero?
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