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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnosis - A/T >> Diagnostic Flow Charts (Cars) >> Chart C-8, Torque Converter Clutch Electrical Diagnosis - 3.1L PFI A & J Bodies (2 Of 2) >> Notes

Chart C-8, Torque Converter Clutch Electrical Diagnosis - 3.1L PFI A & J Bodies (2 Of 2): Notes

The 2nd gear signal switch in this vehicle should be open in 2nd and 3rd gear. ECM uses this 2nd gear signal to disengage TCC when going into a downshift. The 3rd gear switch should be open in 3rd gear. See Figure through Figure.