I thought the TCC (Torque Converter Clutch) signal was only needed with the auto trans. At least that was the case with the LS1 builds I did.
Is the car cranking? Is there provision for a clutch safety switch in the harness?
A lot of guys make the mistake of connecting the ECM power to the power that is not hot when cranking. It needs to be connected to power that is hot both when cranking and running.
Don
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