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Home >> BMW >> 1989 >> 735iL >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Overhaul - ZF 4HP 22H/Eh & ZF 4HP 24-E >> Trouble Shooting >> Torque Converter Clutch Operation >> No Torque Converter Lock-Up Clutch Engagement

No Torque Converter Lock-Up Clutch Engagement

Defective ECU or TCU. Defective torque converter or solenoid valve No. 3.